male NPTF to NPSM swivel fitting Topa

Hydraulic Live Swivels

Best China Hydraulic Swivel Fittings Manufacturer

❖ Suitable for narrow spaces
❖ Withstand high pressure
❖ Adopt pressure balance design
❖ The maximum speed is 10 rpm

Best China Hydraulic Swivel Fittings Supplier

Hydraulic live swivel fittings, often referred to as hydraulic live swivels, are a more specialized type of hydraulic fitting. These fittings are designed with bolts, o-rings, and hydraulic fittings, and the fittings are threaded on both ends to connect with different equipment. Their unique 90 degree bend design prevents twisting and torque on the hose caused by mechanical movement.Topa can supply all swivel fittings, if you have a need or question, please contact us!

Product List

Hydraulic swivel fittings are available in a wide range of threads, such as BSP, JIC, Metric, NPT, and SAE, and we have the right size and material for you. Moreover, if you need special threads or sizes of fittings, you can contact Topa directly and we will arrange an order for you as soon as possible!

Male NPTF to Female NPSM

Hydraulic Live Swivel Fitting 90° Elbow, Male NPTF/Female NPSM, made of Carbon Steel.

Male NPTF to Female NPTF swivel hydraulic fitting

Male NPTF to Female NPTF

Hydraulic Swivel Fitting 90° Elbow, Male NPT, to Female NPT (including NPSM) .

Female NPTF to Female NPTF swivel hydraulic fitting

Female NPTF to Female NPTF

90° Elbow, Female NPTF to Female NPTF, made of carbon steel.

Male NPTF to Male JIC swivel hydraulic fitting

Male NPTF to Male JIC

DIN Metric Light hydraulic Fittings is available in mining, industrial, and construction.

Male JIC to Female NPSM swivel hydraulic fitting

Male JIC to Female NPSM

Swivel fittings 90-degree elbow, Male JIC to Female NPSM Swivel

Male JIC to Male JIC swivel hyaraulic fitting

Male JIC to Male JIC

Hydraulic fittings elbow live swivels, Male JIC to Male JIC

Male SAE to Female NPSM Swivel hydraulic fitting

Male SAE to Female NPSM

Hydraulic live swivel fittings, Male SAE to Female NPSM Swivel

Male SAE to Male JIC swivel hydraullic fitting

Male SAE to Male JIC

Live swivel fitting 90° Elbow, Male SAE to Female JIC

Male SAE to Female SAE Swivel hydraulic fitting

Male SAE to Female SAE

Hydraulic 90-degree elbow swivel fittings, Male SAE to Female SAE

Metric thread ferrule swivel fittings

Metric thread ferrule swivel fittings

Metric threaded ferrules, transition fittings, for all kinds of hydraulic connections.

Metric banjo swivel hydraulic fitting

Metric banjo swivel hydraulic fitting

Metric banjo live swivel fitting, hydraulic transition fittings, for the machinery, transportation and industries.

BSP banjo swivel hydraulic fitting

BSP banjo swivel hydraulic fitting

BSP elbow swivel fitting , with excellent structure and advanced design, are widely used in hydraulic and fluid transfer systems.

BSP thread ferrule swivel fittings

BSP thread ferrule swivel fittings

BSP hydraulic swivel fittings, hollow fittings , Suitable for hydraulic equipment, construction machinery.

Right Angle High Pressure Swivel Fitting

Right Angle High Pressure Swivel Fitting

Right Angle High Pressure Swivel Fitting, Elbow Swivel Fitting. Hydraulic Oil Pipe Right Angle Swivel Fitting.

High pressure right angle swivel fitting

High pressure right angle swivel fitting

High-pressure hydraulic right-angle swivel fitting. Hydraulic Live swivel fitting.

Hydraulic oil pipe swivel hydraulic fitting

Hydraulic oil pipe swivel hydraulic fitting

Hydraulic swivel fitting universal fitting, 360 degree high pressure rotary fitting.

High speed right angle high pressure swivel fitting

High speed right angle high pressure swivel fitting

High speed right angle, high pressure swivel fitting. Carbon steel swivel fitting. Hydraulic oil pipe right angle swivel fitting.

Hydraulic Live Swivel Fittings Features

Precision Engineering: Our hydraulic swivel joints are designed with precision threaded ends to ensure a safe and leak-free connection every time.

Material quality: Made from high-grade materials that resist corrosion and abrasion to extend the life of the fitting.

Compatibility: These threaded ends are compatible with a wide range of hoses and fittings, providing greater flexibility in your system design.

Up to 3,000 PSI: Designed to withstand high pressures, these fittings are rated up to 3,000 PSI, making them ideal for heavy-duty hydraulic applications.

Forged: Rotary joints are forged at high temperatures for added strength and rigidity to better withstand harsh environments.

Safety Measures: Includes built-in safety features to prevent pressure spikes and ensure consistent performance.


hydraulic swivel fittings manufacturer Topa process
Hydraulic Swivel Fitting wholesale process China

Durability: Superior material strength and high-pressure tolerance complement each other to ensure long-term reliability.

360 Degree Swivel: The swivel feature allows for a full 360-degree swivel, providing unmatched flexibility in system configuration.

Anti-tangle design: This feature prevents kinking and twisting of hoses, reducing maintenance time and costs.

Easy Installation: The swivel feature also simplifies the installation process, making it quick and easy.

10 RPM Capability: Designed for optimal performance, these couplings can operate at speeds up to 10 RPM without a significant increase in torque.

Smooth Operation: Even at the highest speeds, this design ensures smooth, consistent operation for increased system efficiency.

Adaptable: Suitable for both low and high-speed applications, it provides a versatile component for your hydraulic system.


Live Swivel fittings industry Topa

Industrial Machinery

With the ability to withstand high pressures, these live swivel fittings are indispensable in industrial environments where machinery operates under extreme conditions. The durability of our fittings ensures that your machinery has a longer operating life, reducing downtime and maintenance costs.

Live Swivel fittings construction Topa

Construction Equipment

Ideal for construction machinery such as excavators, loaders, and cranes that work in harsh conditions. High-pressure tolerances and swivel functions help to increase the operating efficiency of the machine, so you can get the job done faster. Manufactured with safety in mind, our accessories ensure that your construction equipment operates safely, even in the harshest environments.

Live Swivel fittings automotive Topa


Our hydraulic swivel fittings are designed for vehicles that require a high degree of reliability, such as trucks, buses, and specialty vehicles. These fittings ensure smooth and efficient operation of the hydraulic system, thus improving the overall performance of the vehicle. The swivel feature allows easier access to components, simplifying maintenance tasks and reducing labor costs.

Play Video about Hydraulic Live Swivels Topa

Quality Control

Topa’s products undergo a variety of quality control procedures to ensure the quality of the live swivel hydraulic adapters.

Our Factory

Topa-The Best Hydraulic Swivel Fittings Factory

China Hydraulic live swivel fittings manufacturer!

※ Unmatched Quality

Material Excellence: Made from high-grade materials, our Live Swivel Fittings are designed to resist wear, corrosion, and pressure spikes, ensuring long-term reliability.

Precision Engineering: With a focus on precision, these fittings offer secure, leak-free connections that you can rely on.

High-Performance Capabilities

High-Pressure Tolerance: Our fittings are engineered to withstand pressures up to 5,000 PSI, making them ideal for even the most demanding hydraulic applications.

360-Degree Swivel: The full 360-degree rotation allows for greater flexibility and movement, reducing the risk of hose kinks and twists.

※ Cost-Effectiveness

Affordable Quality: Manufactured in China, our Live Swivel Fittings offer a superior cost-performance ratio without compromising on quality.

Reduced Maintenance Costs: The durability and reliability of these fittings mean fewer replacements and less downtime, saving you money in the long run.

Live Swivel manufacturer Workshop china
Live Swivel hose fitting manufacturer Workshop

※ Versatility

Wide Range of Applications: From industrial machinery and automotive systems to construction equipment, these fittings are versatile enough to meet a variety of needs.

Compatibility: Designed to be compatible with a wide range of hoses and couplings, providing greater flexibility in your system design. And our swivels are compatible with all international brands such as Parker hydraulic live swivels, gates hydraulic live swivels, and eaton hydraulic swivel fitting.

※ Trusted Brand

Global Reach: With satisfied clients in the United States, Canada, Australia, and beyond, we have a proven track record of delivering quality products worldwide.

Expertise: With a team of 20 skilled professionals, we pride ourselves on our expertise and commitment to quality.

※ One-Stop Solution

Comprehensive Service: At Topa Hydraulic, we offer a one-stop service for all your hydraulic needs, from fittings to cylinders and beyond.

By choosing Topa Hydraulic Live Swivel Fittings, you’re not just making a purchase; you’re making an investment in quality, reliability, and efficiency.

Hot Sales


What is the primary function of hydraulic swivel fittings?

The primary function is to prevent hose twisting and torque, allowing for greater flexibility and movement in hydraulic systems.

What materials are used in the construction of these fittings?

Our hydraulic swivel fittings are made from high-grade materials that are corrosion-resistant and designed for long-term durability.

What is the maximum pressure these fittings can withstand?

Our fittings are engineered to withstand pressures up to 3,000 PSI, making them suitable for heavy-duty applications.

Do the fittings come with threaded ends?

Yes, our hydraulic swivel fittings come with precision-threaded ends to ensure a secure and leak-free connection.

What is the maximum speed at which these fittings can operate?

These fittings can operate at a maximum speed of 10 RPM without any significant increase in torque as the pressure escalates.

Where are hydraulic swivel fitting used?

Examples include grabs, forestry attachments, cranes and utility boom trucks, demolition shears and mobile excavators, etc.

How does the swivel functionality work?

The swivel feature allows for a full 360-degree rotation, offering unparalleled flexibility in system configuration and reducing the risk of hose kinks and twists.

How do these fittings contribute to operational efficiency?

The high-pressure tolerance and swivel functionality contribute to the machine’s operational efficiency, allowing for faster completion of tasks and reduced maintenance costs.

Are these fittings easy to install?

Yes, the design of these fittings allows for quick and easy installation, reducing labor costs and setup time.

Why should I choose Topa Hydraulic's swivel fittings?

Choosing our hydraulic swivel fittings means you’re investing in quality, durability, and efficiency. We offer a one-stop service for all your hydraulic needs and have a proven track record of delivering quality products worldwide.

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Hydraulic live swivel fittings catalog Topa
JIC vs BSP Hydraulic Fittings

BSP and JIC Hydraulic Fittings: A Comparative Analysis

BSP and JIC Hydraulic Fittings A Comparative Analysis

BSP and JIC Hydraulic Fittings: A Comparative Analysis

In the complex landscape of hydraulic systems, choosing the right fittings is a decision that can significantly impact performance, reliability, and overall efficiency. With a myriad of options available, two types of fittings often stand out—JIC (Joint Industry Council) and BSP (British Standard Pipe). Both come with their unique features, advantages, and limitations. This comprehensive guide aims to delve into the intricacies of JIC and BSP fittings, offering insights into their origins, features, applications, and how to identify and measure them.

JIC Fittings

Definition and Origin

The JIC (Joint Industry Committee) fitting is a hydraulic fitting that originated in the United States. Designed to meet standards set by the Society of Automotive Engineers (SAE), it is commonly used in a variety of hydraulic applications.


JIC fittings are known for their 37-degree flare seating surface, a key feature that distinguishes them from other types of hydraulic fittings. This design provides a strong metal-to-metal sealing surface. Also, JIC fittings have straight threads, and they are typically made of high-strength materials such as stainless steel, carbon steel, and brass, ensuring durability and reliability.

Typical Applications

JIC fitting guide Topa

JIC fittings are versatile and can be used in a variety of industries, including:

Construction machinery

Agricultural equipment

Automotive hydraulics

Industrial hydraulics

They are particularly useful in systems where high-pressure capabilities are required and leakage is a major concern.


High-Pressure Handling: The 37-degree flare design allows JIC fittings to effectively handle high-pressure conditions.

Versatility: JIC fittings are compatible with a wide range of tubing and hose materials, making them highly versatile.

Easy to install: The design allows for quick and easy assembly and disassembly, saving time and labor costs.

Durability: JIC fittings are made of high-strength materials for durability, reducing the need for frequent replacement.


Limited Material Options: Although durable, JIC fittings have limited material options compared to other fitting types.

Possibility of over-tightening: Metal-to-metal seals can sometimes be over-tightened, which can cause deformation and break the seal.



Threads Pre

Female Thread

Male Thread


































































JIC hydraulic fittings size chart

BSP Fittings

Definition and Origin

BSP (British Standard Pipe) fittings are a globally recognized standard for connecting and sealing pipes and fittings. Originating from the United Kingdom, BSP threads have been adopted internationally and are based on ISO 228 and Whitworth standard threads. Developed in 1841, Whitworth threads were the world’s first screw thread standard, paving the way for BSP’s widespread adoption.

Features of BSP Fittings

BSP threads are rounded and have a 55-degree thread angle, which is different from the 60-degree angle found in NPT threads.  BSP threads come in two styles—parallel (often referred to as “G” threads) and tapered (referred to as “R” threads). BSP fittings often use bonded ring seals or O-rings, providing a secure, leak-tight seal without the need for thread sealants.

China BSP Fittings Topa


Global Acceptance: Due to their British origin and international standardization, BSP fittings are widely accepted and used globally.

Excellent Sealing Properties: BSP fittings offer superior leak-tight seals, especially when used with bonded rings or O-rings. This makes them highly efficient in high-pressure systems.

Ease of Installation: The design of BSP fittings allows for straightforward assembly and disassembly, saving time and reducing labor costs.

Material Versatility: BSP fittings are made from a variety of materials, including steel, stainless steel, brass, and even plastics, making them suitable for a wide range of applications.

High-Pressure Ratings: BSP fittings are known for their ability to withstand high pressures, making them ideal for demanding hydraulic applications.


Possibility of Leakage: While BSP fittings generally provide an excellent seal, metal-to-metal contact can sometimes lead to leakage if not installed properly.

Limited Availability in Some Areas: BSP fittings may not be readily available in areas where American standards are the norm.

Cost: High-quality BSP fittings made from premium materials can be more expensive than other types of fittings.


per inch


Major diameter











































1 1/4





1 1/2










2 1/2

























BSP hydraulic fittings size chart

Key Differences Between JIC and BSP Fittings

Design and Construction

JIC (Joint Industry Council) Fittings: Originating in the United States, JIC fittings are known for their 37-degree flare seating surface. They are commonly used in high-pressure hydraulic systems.

BSP (British Standard Pipe) Fittings: Originating in the United Kingdom, BSP fittings come in two main types: parallel (BSPP) and tapered (BSPT). They are known for their rounded threads and are widely used in fluid and gas applications.

BSP Fittings types Topa

Comparison of the Design Features

JIC: The 37-degree flare seating surface ensures a metal-to-metal seal, which is highly effective in high-pressure systems.

BSP: The 30-degree cone seat, rounded threads, and the option for tapered threads provide a secure, leak-tight seal, especially when using bonded seals or O-rings.


JIC: Known for their high-pressure handling capabilities, making them ideal for hydraulic systems.

BSP: Known for their reliable sealing mechanisms, making them suitable for both high and low-pressure systems.

Pressure Handling Capabilities

JIC: Can handle pressures up to 10,000 psi depending on the material and size.

BSP: Generally suitable for up to 6,000 psi, but this can vary based on the material and application.


JIC: Primarily compatible with other JIC fittings and some SAE fittings.

BSP: Compatible with other BSP fittings and, in some cases, with Metric and NPT fittings.

Availability and Sourcing Options

JIC: Widely available in the United States and other countries that follow SAE standards.

BSP: Widely available in the UK and countries that follow British standards.

How to Identify JIC and BSP hydraulic fittings

Visual Inspection

JIC Fittings

JIC fittings are easily recognizable by the two marks present on the hex, which is the American Standard marking. Additionally, these fittings have a 37-degree flare at the end. If you’re unsure about the angle, a specialized protractor can be used to measure it accurately. This is crucial because the 37-degree flare is a defining characteristic of JIC fittings.

BSP Fittings

For BSP fittings, you’ll typically find an indentation on the hex of a fractional fitting. This is a quick way to identify BSP over other types. The fittings sit at a 30-degree angle, which is another distinguishing feature. Furthermore, the type of threads can give you more information: tapered threads indicate BSPT (British Standard Pipe Tapered), while parallel threads indicate BSPP (British Standard Pipe Parallel).

30° male and Female BSP Fittings Topa

Additional Identification Methods

Thread Pitch: Use a thread gauge to measure the threads per inch (TPI) for both JIC and BSP fittings. JIC usually has a finer thread, while BSP threads are generally coarser.

Country of Origin: JIC is predominantly used in the United States, while BSP is common in the UK and other countries that follow British standards. Knowing the origin of the machinery can offer clues.

Manufacturer’s Markings: Some manufacturers include specific markings or codes on the fittings, which can be cross-referenced with product manuals for identification.

How to Measure JIC and BSP Fittings

Measuring JIC Fittings


When it comes to measuring the diameter of JIC fittings, precision is key. Utilize calipers to measure the outer diameter of the male thread or the inner diameter of the female thread. This step is crucial for ensuring that the fitting will properly connect with its corresponding component, thereby preventing any potential leaks or system failures.

Thread Count

Thread count is another vital metric. To determine the thread pitch, count the number of threads within an inch. This information is essential for compatibility, especially when you’re dealing with high-pressure hydraulic systems where even a minor mismatch can lead to significant issues.

Flare Angle

The flare angle is a defining characteristic of JIC fittings. Use a specialized angle gauge to confirm the 37-degree flare angle. This is especially important in high-pressure applications where a secure, leak-proof connection is paramount.

Measuring JIC Fittings Topa

Measuring BSP Fittings


Just like with JIC fittings, the diameter is a critical measurement for BSP fittings. Use calipers to measure the major diameter of the male thread or the inner diameter of the female thread. Accurate measurement ensures that the fitting will seamlessly integrate into your hydraulic system.

Thread Count

BSP thread pitch is generally measured in threads per inch (TPI). To accurately determine this, use a thread gauge. Knowing the correct TPI is essential for ensuring that the BSP fitting will be compatible with other components in the system.

Thread Angle

BSP fittings have a unique 55-degree thread angle. Confirm this angle using an angle gauge to ensure you have the right type of fitting. This is particularly important in applications requiring a secure, leak-proof connection.


BSP fittings come in two main types: BSPP (parallel) and BSPT (tapered). To determine which type you have, use a parallel or tapered gauge. This is crucial because each type has its own set of applications and compatibility requirements.

Making the Right Choice for Your Business

Assessing Your Needs

Before diving into the specifics of BSP and JIC fittings, it’s crucial to assess the needs of your hydraulic systems. Consider factors like operating pressure, fluid type, temperature, and the geographical location of your operations. These elements will guide you in making an informed decision.

BSP vs JIC: A Quick Comparison

BSP (British Standard Pipe) Fittings: Known for their excellent sealing properties and global acceptance. They are versatile, with both parallel (BSPP) and tapered (BSPT) options. Ideal for high-pressure, high-vibration applications.

JIC (Joint Industry Council) Fittings: Recognized for their high-pressure handling capabilities and 37-degree flare angle. They are predominantly used in the United States and are versatile, and compatible with a wide range of tubing and hose materials.

The Right Choice for You

High-Pressure Systems: If your operations require high-pressure handling, JIC might be more suitable due to its 37-degree flare design.

Global Operations: If your business operates internationally, especially in regions following British standards, BSP fittings might be the better option due to their global acceptance.

Versatility: If you need a fitting that can be used in a variety of applications, both JIC and BSP offer versatility, but BSP provides an added advantage with its parallel and tapered options.

Cost-Effectiveness: JIC fittings are generally more expensive due to their high-pressure capabilities. If cost is a significant factor, BSP might be a more economical choice.

Choosing the Best Manufacturer

Quality Assurance: Look for manufacturers who offer quality certifications and can provide test reports for their products.

Product Range: Choose a manufacturer that offers a wide range of fittings, giving you more options to find the perfect fit for your needs.

Customer Support: Excellent customer service, including after-sales support, can be a deciding factor.

Reputation: Research customer reviews and industry reputation to ensure you’re partnering with a reliable manufacturer.

Customization: If your hydraulic systems have unique requirements, a manufacturer that offers customization services can be invaluable.

By considering these factors, you can make an informed decision that aligns with the specific needs of your business. Whether you opt for BSP or JIC fittings, the key is to choose based on your operational requirements, ensuring optimal performance and reliability.

Why Choose Topa

Unmatched Quality

At Topa, we pride ourselves on delivering high-quality hydraulic fittings that meet international standards. Our products undergo rigorous quality checks to ensure they meet the high-pressure and high-performance demands of hydraulic systems.

Extensive Product Range

Topa offers an extensive range of hydraulic fittings, including both BSP and JIC types. This wide selection ensures that you’ll find the perfect fit for your specific needs, whether you operate domestically or internationally.

Competitive Pricing

Being a direct factory, Topa offers competitive pricing without compromising on quality. Our products provide a higher cost-performance ratio, making us a go-to choice for businesses looking for both affordability and performance.

BSP hydraulic fitting manufacturer process

Exceptional Customer Service

Customer satisfaction is at the core of our business. Our dedicated customer support team is always ready to assist you with any inquiries or issues you may have, both pre-sale and post-sale.

Proven Track Record

With years of experience in the hydraulic industry, Topa has built a reputation for reliability and excellence. Our clients, who range from experienced salespeople to maintenance professionals, trust us for their hydraulic fitting needs.

By choosing Topa, you’re not just buying a product; you’re investing in a partnership that offers quality, reliability, and value. Make the right choice for your business—choose Topa, the best hydraulic fittings manufacturer in China.


In summary, the decision between JIC and BSP fittings boils down to your specific needs, and this guide serves as a comprehensive resource to help you navigate this complex yet crucial aspect of hydraulic systems. Choose wisely, and you’ll set the stage for operational excellence and long-term success.

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Swept adapter manufacturer Topa

Swept Adaptor


Swept Adaptor Supplier in China

Swept adapters have emerged to meet these requirements with a unique curved design that optimizes fluid flow and reduces pressure drop. Constructed from high-strength materials such as steel, these adapters are long-lasting, durable, and meet international standards. Although they have a slightly higher initial cost, their long-term performance advantages make them a cost-effective investment. Their design makes them particularly effective in high-pressure and complex systems. In addition, their robust construction reduces long-term maintenance costs. All in all, swept hydraulic adapters are the perfect combination of quality and economy and are a valuable addition to any hydraulic system. If you need Swept hydraulic adaptors, please contact us!

Product Lists

Swept adapters have threaded ends on both sides and a curved center to distinguish them from other regular adapters. Topa can provide male-to-female, male-to-male, and female-to-female Hydraulic hydraulic swept adapters. If you would like more information, please contact us directly!

45° JIC female to female ORFS Swept adapters Topa

45° JIC female to female ORFS

Elbow 45° JIC female to female ORFS Swept adapters

90° BSP male to male Swept adapters Topa

90° BSP male to male

Elbow 90° BSP male to male Swept adapters

45° BSP female to female Swept adapters Topa

45° BSP female to female

Elbow 45° BSP female to female Swept adapters

45° BSP male to male Swept adapters Topa

45° BSP male to male

Elbow 45° BSP male to male Swept adapters

90° JIC male to female Swept adapters Topa

90° JIC male to female

Elbow 90° JIC male to female Swept adapters

90° JIC female to Female BSP Swept adapters Topa

90° JIC female to female BSP

Elbow 90° JIC female to Female BSP Swept adapters

45° JIC male to Female Swept adapters Topa

45° JIC male to female

Elbow 45° JIC male to Female Swept adapters

95° JIC female to female metric

Elbow 95° JIC female to Female metric Swept adapters

Swept Adapters Feature

When it comes to hydraulic systems, efficiency, and reliability are of paramount importance. Swept adaptors have emerged as game-changers in the hydraulic components sector, playing a vital role in maximizing performance. Here’s a deep dive into the various facets of swept connectors for professionals like you who demand both quality and affordability.

Design & Construction

Swept adapters feature a curved design as opposed to the traditional straight or 90-degree angle adapters. This unique geometry facilitates smoother flow paths for hydraulic fluid, reducing pressure drops and enhancing the overall efficiency of the system.

Material & Manufacturing

Typically made of high-strength steel or stainless steel, swept adapters are designed for high-pressure applications. Manufactured under strict quality controls, these components meet international standards to ensure durability and longevity. This feature is particularly valuable for our clients, who often face the challenge of sourcing reliable and high-quality components.

hydraulic swept adapter feature
swept fitting China factory process

Performance Advantages

Reduced Pressure Drops: The curved design minimizes turbulence, ensuring a smooth flow of hydraulic fluid.

Optimized Efficiency: Lower pressure drops mean your hydraulic system can operate more efficiently, saving both time and money.

Enhanced Durability: High-quality materials and superior design make swept adapters robust enough for challenging industrial environments.


While they might be priced slightly higher than standard adapters, the long-term benefits such as reduced maintenance costs and enhanced system performance make them a highly cost-effective choice. And let’s not forget the impact on the system’s life span!



High Pressure Systems swept fittings Topa

High-Pressure Systems

The robust design and high-quality materials used in swept fittings make them particularly effective for high-pressure systems. Their curved design allows fluid to flow smoothly even at high velocities, ensuring the system performs optimally. This is a crucial advantage when the system operates in environments requiring quick and powerful hydraulic actions, such as in heavy machinery or high-capacity lifting devices.

complex systems swept adaptor Topa

Complex Systems

In hydraulic circuits where space is at a premium and system complexity is high, the efficiency of each component can significantly impact the system’s overall performance. Swept couplings, with their optimized flow path, are excellent for these scenarios. They can be easily fitted into tighter spaces and corners, thereby reducing the need for additional fittings or longer hoses. This design feature not only saves space but also minimizes potential leak points in your system.

maintance and care swept adaptor Topa

Maintenance & Care

The durability of swept adapters means they don’t just perform well—they last. Unlike standard adapters that might wear out or fail under challenging conditions, swept fitting adapters are built for longevity. Thanks to the robust construction, maintenance requirements for swept adapters are generally lower. This is especially beneficial for maintenance professionals who aim to keep operational downtime to a minimum.

Why Choose Topa

swept fitting manufacturer storage
swept fitting manufacturer Workshop

When it comes to hydraulic systems, choosing the right components can make the difference between optimum performance and the constant headache of maintaining your system. At Topa, we’ve built a reputation for providing quality hydraulic components, such as hydraulic swept adapters, that meet the exacting requirements of hydraulic industry professionals. Here’s why choosing Topa Hydraulic is a smart move for you:

Competitive pricing

We pride ourselves on being a direct sales factory. We are able to offer competitive prices without compromising on quality, so you get your money’s worth. With Topa, you don’t have to choose between affordability and high performance – you can have both.

International Standards, Made in China

Our products are manufactured in China under strict quality control to ensure compliance with international standards in terms of durability, performance, and reliability. This is especially important for customers who face challenges in sourcing reliable components. Rest assured that our products offer a better price/performance ratio and are perfectly suited to your needs.

One-stop shop

No more traveling between different suppliers for different hydraulic needs. We offer a full range of products from hydraulic cylinders to fittings and adapters, providing you with the convenience of one-stop shopping.

Customized Solutions

We know that not all hydraulic systems are created equal. Our team of highly skilled professionals can customize solutions to meet the specific needs and challenges of your hydraulic applications.


Q: What is a swept adaptor?

A: A swept adapter is a specialized hydraulic adapter featuring a curved design that optimizes fluid flow, reduces pressure drops, and enhances the overall efficiency of your hydraulic system.

Q: What makes the design of a swept connector unique?

A: Unlike traditional straight or 90-degree angle adapters, swept adopter fittings have a curved geometry that facilitates smoother flow paths for hydraulic fluids, leading to reduced turbulence and pressure drops.

Q: What materials are swept couplings made from?

A: Swept hydraulic adapters are generally made from high-strength steel or stainless steel to withstand high-pressure applications and offer long-lasting durability.

Q: How do swept adapters improve system performance?

A: The unique design of swept connectors minimizes turbulence, ensuring a smooth flow of hydraulic fluid. This results in optimized efficiency, allowing your system to operate more effectively while also saving both time and money.

Q: What types of hydraulic systems benefit most from swept adapters?

A: Swept adapters are particularly effective in high-pressure systems requiring high fluid velocities. They are also ideal for use in complex hydraulic circuits where space is limited, and efficient flow is crucial.

Q: Are swept adapters more expensive than standard adapters?

A: While the initial cost may be slightly higher than standard adapters, the long-term benefits such as reduced maintenance costs and enhanced system performance make swept adapters a highly cost-effective choice.

Q: How do you maintain a swept adapter?

A: Maintaining swept adapters is generally straightforward. Their robust construction means they require less frequent replacement, thereby lowering long-term operational costs.

Q: Do swept adapters corrode easily?

A: Due to the high-quality materials used in their construction, swept hydraulic  adapters are less susceptible to corrosion, enhancing their durability and reducing maintenance needs.

Q: Why should I buy swept elbow adapters from Topa Hydraulic?

A: At Topa Hydraulic, we offer products that are manufactured under strict quality controls and meet international standards. Our swept elbow adapters offer an excellent cost-performance ratio and come with the added benefit of our one-stop service for all your hydraulic needs.

Q:What is MOQ of swept hydraulic adapters?

A: 100piece

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understanding BSP hydraulic fittings

Understanding BSP Hydraulic Fittings

Understanding BSP Hydraulic Fittings: The Final Guide

This guide takes an in-depth look at the world of BSP, from its historical background to the various types such as BSPP and BSPT, each of which offers unique benefits. Whether you’re a seasoned maintenance professional or a distributor looking for a reliable product, understanding the ins and outs of BSP is invaluable. We’ll also explore the importance of ISO standards in ensuring the safety and efficiency of these fittings, and guide you through how to effectively measure and install them. So if you’re looking for a comprehensive resource that covers everything you need to know about inch threads, read on.

History of British Standard Pipe

The history of British Standard Pipe (BSP) can be traced back to early 20th century England. Designed as a comprehensive set of threading standards, typically used for joining pipes and fittings, British Standard Pipe (BSP) emerged to simplify and standardize the various thread types available in the UK. As technology advances, BSP threads are becoming progressively more global.

BSP Thread Types

Parallel Thread: BSPP

BSPP stands for British Standard Parallel Pipe. These fittings come with either parallel or straight threads.The pitch angle of a BSPP fitting is always 55 degrees. The number of threads varies depending on the size of the fitting.

BSPP Advantages

The parallel threads of BSPP fittings make them easy to install and replace, reducing downtime during maintenance. In addition, because the threads are parallel, BSPP fittings typically use a bonded seal or o-ring for a leak-tight connection. This additional seal adds another layer of security to your piping system.

BSPP vs BSPT thread

Tapered Thread: BSPT

BSPT is British Standard Tapered Pipe Thread. These fittings look a lot like BSPP but with one key difference – BSPT threads are tapered. This tapered thread provides a more secure fit and better sealing. Like BSPP fittings, BSPT fittings have a standard pitch angle of 55 degrees.

Advantages of BSPT

Because the threads are tapered, BSPT fittings form their own seal. This makes them very effective in applications where leakage is absolutely essential, such as in gas lines or high-pressure hydraulic systems. Often no additional sealant is required, but if you do, then the addition of a sealant can provide additional security.

Which better?

Whether you choose BSPP or BSPT depends largely on your specific needs. If you are looking for a system that is easy to maintain, then BSPP is the way to go. But if you need a safer connection, especially in high-pressure or high-vibration environments, BSPT fittings provide an extra level of safety.

BSP International Standards

ISO stands for International Organization for Standardization. These are the people who make sure that products and systems conform to specific standards, making it easier for companies around the world to understand what they’re buying. For now, let’s focus on the two main ISO standards for BSP fittings: ISO 7 and ISO 228.


ISO 7 focuses on tapered threads, such as those found in BSPT fittings. The standard defines the dimensional rules and how the taper works. Its purpose is to ensure that tapered fittings have a good seal, especially in high-pressure systems.

For example, you are installing a gas line or a high-pressure hydraulic system. You need to make sure that the fittings don’t leak. By insisting on ISO 7-compliant BSPT fittings, you are essentially ensuring a safe and reliable system.

ISO BSP standard

ISO 228

ISO 228, the standard for parallel threads in BSPP fittings, specifies dimensions, tolerances, and more. Basically, it ensures a good fit and proper functioning of parallel threaded fittings.

If you’re dealing with water or hydraulic systems that don’t require an extremely high level of leak-proof safety, then ISO 228 is the standard of choice. When you buy a fitting that complies with ISO 228, you buy reliability and performance.

Multiple Standards Compliance

Many BSP fittings are compliant with both ISO 228 and ISO 7. This means they conform to both parallel and tapered thread rules. So if you see a fitting labeled with both ISO 7 and ISO 228, it’s a double guarantee that you’re buying a quality product.

Choosing fittings that comply with international standards isn’t just about complying with the rules. In the long run, it’s about ensuring that your system is safe, efficient and economical. In addition, because standardized fittings are more widely available, it’s easier to replace or upgrade them.

BSP Fitting Benefits


First up is versatility. One of the greatest advantages of BSP fittings is that they are suitable for a wide range of applications. From water supply systems to industrial hydraulic lines, these fittings can do it all. Whether you’re a seasoned maintenance professional or just setting up your first hydraulic system, they’re designed to meet your needs.

Specialized seals

Fractional pipe fittings are great at sealing against leaks. Both the parallel-threaded BSPP and the threaded BSPT seal well. while the BSPP typically uses adhesive seals or O-rings, the BSPT relies on its tapered threads to do the sealing job.


These fittings are extremely robust. They are designed to withstand high pressures and resist wear and tear. Their durability saves money in the long run. Quality BSP fittings may cost a little more upfront. However, when you consider their longevity and lower maintenance requirements, the overall price/performance ratio is high.

What is BSP Thread used for?

marine application hose clamps

Water Supply Systems

One of the most common uses for BSP threads is in water supply systems. These pipes carry clean water to your home or business. A BSP tapered thread ensures a secure, leak-proof connection, which is essential for a system as important as a water supply.

Hydraulic Systems

Next up is the hydraulic system. If you’re working with machinery that uses fluids to transmit power, such as excavators or hydraulic presses, imperial threads are often the preferred choice. They can withstand high pressures and provide a solid seal, making them ideal for these setups.

Gas Piping

Gas piping is another great application for inch-tapered threads. Examples include gas piping for home heating and even larger installations such as industrial gas supplies. The excellent sealing ability of the inch thread makes it a safe choice for gas applications.

Marine applications

Inch threads are also used in boats and ships, where they are commonly used in marine hydraulic systems and even bilge pumps.BSP fittings are reliable and made of high-quality materials to resist the corrosive effects of salt water.

Compatibility and Interchangeability


BSP threads stand for British Standard Pipe and are widely recognized for their strong sealing ability. the JIC or Joint Industrial Council thread originated in the United States. These fittings usually have a 37-degree flare at the end and are specifically designed for high-pressure conditions.

BSP and JIC differ in sealing mechanisms and pitch angles; JIC uses a flared sealing surface, while BSP may use a bonded seal or o-ring. Because of these differences, they are not directly interchangeable, and you typically need an adapter to connect the BSP fitting to the JIC system.



NPT, or National Pipe Thread, is widely used in the United States, especially for low-pressure applications. The threads are tapered and are usually sealed by thread engagement. BSPP, on the other hand, typically uses a bonded seal or O-ring and has parallel threads. Although the two fittings are used for similar purposes, they have different thread forms and sealing mechanisms, which means they are not directly interchangeable. If you need to switch from one system to the other, you’ll likely need an adapter to secure the connection.

How to Measure BSP Hydraulic Fittings

Prepare your tools

First, grab your calipers and thread gauge. These tools are crucial for accurate measurements.

Measure the Outside Diameter

Start by measuring the outside diameter of your male threads. Simply open the caliper and gently place it over the widest part of the thread. Make a note of this number and you can use a table to count it.

Counting Threads

Next, count the number of thread crests within a given distance (usually one inch).

Pitch Angle

For inch-threaded fittings, the standard pitch angle is 55 degrees. You may find this information in the manufacturer’s specification sheet, but you can also measure it if desired.

Parallel or tapered?

Is the fitting BSPP (parallel) or BSPT (tapered)? For BSPP, the thread diameter remains the same. With BSPT, you will notice that the diameter decreases as the threads move downward.

Check for add-ons

Some fittings may have o-rings or adhesive seals. These features also need to be taken into account when measuring, as they can affect how the fitting interacts with its mating parts.

Double-check your work

After you’ve written down all your measurements, it’s a good idea to double-check them. Mistakes can and do happen. Checking again now will save you a lot of trouble later.

G / R
































































































1 1/8









1 1/4









1 3/8









1 1/2









1 5/8









1 3/4









1 7/8


















BSP hydraulic fittings size chart

How to Install BSP Hydraulic Fittings

Step 1: Prepare Butt Threads

Clean any dirt, debris or old sealant from the male and female threads. A wire brush is usually sufficient. This helps ensure a good, clean fit.

Step 2: Select the correct sealing mechanism

For BSPP (parallel): Use o-rings or bonded seals.

For BSPT (tapered): thread sealant or PTFE tape works best.

Step 3: Apply Sealant

If using a thread sealant, apply a small amount of sealant evenly around the male threads, avoiding the first thread, to prevent sealant from entering the system. For O-rings, make sure they are firmly seated in the groove.

Step 4: Hand Tightening

Begin by hand tightening the fitting. Turn the fitting until you feel the threads engage firmly. This will prevent cross-threading, which can be a difficult problem to solve.

Step 5: Use a Torque Wrench

Now it’s time to use the torque wrench. Tighten the fitting to the manufacturer’s torque specifications. Over-tightening is just as bad as over-loosening, so keep it precise!

Step 6: Double Check Your Work

After tightening, check over all the components. Look for any signs of cross-threading or over-tightening that could lead to leaks or failure. Now is the time to spot problems.

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Step 7: Test the System

Before the system is fully operational, perform a pressure test to ensure there are no leaks. If leaks are found, it may be necessary to retighten fittings or reapply sealant.

Step 8: Keep Records

Record the date of installation, torque settings, and any other pertinent information. This will make the job easier when fittings need to be inspected or replaced.


In the world of hydraulic systems and components, British Standard Pipe (BSP) threads stand out for their quality, reliability and versatility. Whether you’re an experienced salesperson in the hydraulics industry or a retailer trying to understand the right type of fitting, this guide will give you an insight into the benefits and applications of BSPP and BSPT threads. In addition, understanding international standards such as ISO 7 and ISO 228 will save you time and money by ensuring that the couplings you choose operate safely and efficiently. And don’t forget the meticulous steps involved in measuring and installing these fittings, which ensure that your hydraulic system operates at peak efficiency. In the future, the knowledge you’ve gained here will enable you to make smarter, more informed decisions when selecting and using fittings for fiat tubing to meet a variety of needs.

Choose Topa-BSP Hydraulic Fitting Supplier

We know you’re always looking for reliable, economical hydraulic components. That’s why we’re pleased to introduce you to Topa’s line of BSP (British Standard Pipe) fittings.

So, why should you choose our BSP fittings? Firstly, every fitting we produce meets strict international standards such as ISO 7 and ISO 228. This ensures you get a product you can trust.

Whether you need a parallel fitting (BSPP) or a tapered fitting (BSPT), we’ve got you covered. Our BSPP fittings are interchangeable with Parker hydraulic fittings, Eaton standard.

Cost matters, and we understand that. Our direct factory setup allows us to offer you great prices without sacrificing quality. We provide you with a cost-effective solution that ensures you get what you pay for.

What sets us apart is our service. Our team of 20 skilled professionals is ready to help you.

So when you think of BSP fittings, think Topa, your one-stop solution for all your hydraulic needs, with the quality and price you deserve.

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Hydraulic Adapters Manufacturer

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Best Hydraulic Adapters Manufacturer in China

Hydraulic adapters are one of the most important hydraulic fittings in a hydraulic system. Unlike hose fittings, hydraulic adapters can connect different sizes of hydraulic components or hydraulic pipes at the same time. 

As a professional hydraulic adapters manufacturer, Topa is committed to providing you with the highest quality adapters, welcome to contact us!

Product Lists

Hydraulic adapters are a big classification in hydraulic fittings, it also includes various small classifications. Such as bulkhead fittings, tees, crosses, plugs, caps, and so on. These classified fittings also have various types of threads including JIC, BSPP, BSPT, NPT, Metric, DIN, ORB, JIS, and ORFS threads. You can click on the image below for more details or contact us directly!

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BSP 60° cone flare hydraulic adapters, BSPP and BSPT thread adapters.

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JIC, BSP, Metric thread hydraulic bulkhead adapters.

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Male hydraulic plugs and female hydraulic caps, for use with fluid systems.

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Metric hydraulic adapters

Metric hydraulic adapters, DIN standard adapters.

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Hydraulic tee adapters

All threads hydraulic tee adapters, three-way hydraulic fittings.

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JIS hydraulic adapter

JIS standard hydraulic adapters, Japanese standard adapter fittings.

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Hydraulic test adapter

Hydraulic test point adapter, for use with hydraulic fluid test point.

Hydraulic Adapters Features

Hydraulic adapters are the most commonly used accessories in hydraulic systems. They allow the connection of fittings or pipes of different sizes to form a closed fluid circuit in a hydraulic system.

Topa’s hydraulic adapters are available in different materials and sizes. Common materials include brass, stainless steel, and carbon steel. The advantages of different materials vary, so you can choose the fitting material according to your needs.

The material of the hydraulic adapter determines the safety and performance of the hydraulic system. As a professional hydraulic adapter manufacturer, Topa provides high-quality, rigorously tested, and certified hydraulic adapters to ensure that the risk of leakage and malfunction can be minimized during use.

Advantages of Topa hydraulic adapters:

  1. Complete range
  2. Affordable prices
  3. High quality
  4. Durable                                                                                                
Topa Hydraulic Adapters Manufacturer in China


Hydraulic adapters play a vital role in various industrial sectors. Whether in the industrial, agricultural, automotive, construction or chemical, petroleum, or food processing industries, hydraulic adapters play an indispensable role in ensuring the stable operation of hydraulic systems.

Topa hydraulic adapters China manufacturer agriculture


Hydraulic adapters are used in agriculture, whether for large-scale machinery, transportation, or irrigation. The adapters connect the hydraulic systems and ensure the proper functioning of agricultural production.

Topa hydraulic adapters China manufacturer oil and gas

Oil and Gas

Oil and gas require high-quality adapters to ensure a safe working environment, Topa's leak-free, high-temperature, and high-pressure resistant hydraulic adapters increase the safety of hydraulic systems.

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Aerospace hydraulic systems are very demanding. Ordinary quality hydraulic adapters are not sufficient for their use, but Topa has a more specialized product line to provide you with the highest quality adapters.

Why Choose Us


We can provide you with customized fitting services, Topa is a professional hydraulic adapters manufacturer who can design the material, appearance, thread, logo, and other details for you. You can put forward detailed requirements and we will try our best to fulfill them.  


Every Topa employee is committed to a high level of professionalism. Our staff responds to your questions, arranges orders quickly, and manufactures each product rigorously.



Topa’s factory has a large number of CNC machining machines, which can produce hydraulic products of various specifications. We have professional production technicians and inspection staff who will strictly control the quality of each product to ensure that you receive the best product.


We have professional shipping partners who can provide you with a variety of shipping methods. topa will arrange transportation as quickly as possible so that the goods reach you as soon as possible.

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What are hydraulic adapters?

Hydraulic adapters are metal products, made of carbon steel, stainless steel, brass and other materials. They have two or more threaded ends and can be connected to hydraulic components.

What threads do hydraulic adapters have?


All threads are included. Examples include JIC, NPT, BSP, JIS, Metric, and ORFS. These threads can be used in a variety of applications.

What types of adapters are available?

Thread adapters, flange adapters, and push-in fittings.

What is the difference between a hose fitting and an adapter?

One end of a hose fitting is used to connect a hose and the other end is used to connect a hydraulic component. The adapter is used to connect hydraulic lines and components of different sizes.

In what applications can hydraulic adapters be used?

Machine building, agriculture, construction, food processing, chemical, aerospace, marine, oil and gas industries.

How do I choose the right hydraulic adapter?


Choose according to your hydraulic system and the environment in which it will be used. If you are not sure how to choose, please contact us and our professional staff will help you choose.

Is Topa a professional hydraulic adapters manufacturer?

Topa is one of the most professional hydraulic adapters manufacturer in China, we will provide you with the best hydraulic fittings.

How long can the adapter last?

It depends on your usage environment. Factors such as acid, alkali, vibration, dust will affect the life of the hydraulic adapter.

Why use hydraulic adapters?

Hydraulic adapters can connect different hydraulic lines to ensure the proper functioning of the hydraulic system. And they can also adapt to different environments to ensure the safety of the hydraulic system.

Are there discounts on Topa products?

The larger the order, the better the price.

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Flexible Metal Hose Assembly

Flexible Metal Hose Assembly

Topa supplies all kinds of flexible metal hose assemblies, our thread end flexible metal hose has NPT, BSP, JIC, and Metric thread. Those thread end corrugated metal hoses are flexible metal hoses, that can be applied in vacuum, water, chemical, and food applications. We promise to supply high-quality flexible metal hoses.

If you have any questions about thread end flexible metal hoses, please contact us!

Flexible Metal Hose Assembly Video

This video is about the details of Topa thread end flexible metal hose assembly.

Topa can provide all sizes, materials, lengths, and threads. We will follow the production process strictly and produce each batch of products carefully, and we will carry out a full set of quality control for the products, welcome you to order.

If you have any questions of thread end flexible metal hoses,  please contact us.

Flexible Metal Hose Catalog

This catalog is about flexible metal hoses.

Topa can offer all kinds of hydraulic flexible metal hoses, and our catalog also including all of them.

Please contact us If you need more information on corrugated metal hoses or would like some free samples.

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BSP vs NPT title Topa


BSP VS NPT Threads:What are the Differences?

Table of Contents


In the field of hydraulic fittings and piping, two threads are international standards: the British Standard Pipe Thread (BSP) and the National Tapered Pipe Thread (NPT). These two thread systems have become the cornerstone of modern hydraulic applications and each has unique characteristics and areas of application. This article details all about BSP threads as well as NPT threads, so if you want to know more, please continue reading!

A Brief Historical Background

The evolution of BSP and NPT threads dates back to the Industrial Revolution when standardization became essential. The 55-degree angle of the BSP thread and the 60-degree angle characteristic of the NPT thread were developed by British engineer Joseph Whitworth and American engineer William Sellers, respectively.

The design developed by Sir Joseph Whitworth in the mid-19th century laid the foundation for the English line, known as the Whitworth line, which became the standard line in England and later spread to other European countries and Australia. The shape of the Whitworth line was revolutionary at the time, providing a uniform method of cutting and measuring lines. This innovation marked a major advance in engineering, making threaded connections more precise and consistent. The Whitworth system introduced the concept of standardized thread angles (specifically 55 degrees) and standardized thread pitches. This standardization facilitated the mass production of threaded parts and contributed to the rapid industrialization of the 19th century.

On the opposite shores of the Atlantic, William Sellers pioneered the introduction of the 60-degree thread angle, forming the foundation for the NPT (National Pipe Thread) standard. Recognized for its efficiency and ease of manufacture, Sellers’ design was swiftly adopted as the American standard. This innovation was more than a technical achievement; it marked a turning point in American engineering. By setting a precedent for threaded connections across diverse industries, Sellers’ 60-degree thread angle became synonymous with quality and precision. It facilitated standardization and mass production, driving industrial growth and technological advancement in the United States, and continues to be a vital part of modern hydraulic systems.


Threaded connections serve as the vital backbone of hydraulic systems. From the energy pulsing through power plants to the intricate workings of manufacturing facilities, the selection between inch (BSP) or American (NPT) threads significantly influences efficiency, safety, and performance. The choice is not merely technical; it embodies engineering philosophies. The metal-to-metal contact of an NPT fitting offers a robust seal, while the rounded contours of a BSP thread provide unique sealing properties. For professionals across various industries, understanding the nuances of these systems is more than essential; it’s a critical skill that underpins the integrity and functionality of countless hydraulic applications.

BSP vs NPT banner

BSP Pipe Threads

British Standard Pipe (BSP) threads are a hallmark of quality and precision in the hydraulic industry. Based on ISO 228 and Whitworth standard threads, BSP threads are the go-to choice in European countries and Australia. Their unique design, characterized by a 55-degree thread angle, sets them apart from other thread types, reflecting a commitment to quality, reliability, and innovation.

Types of BSP Threads


BSPP (British Standard Pipe Parallel): With parallel threads, BSPP offers a reliable and versatile option for various applications. It’s commonly used in low-pressure applications where a tight seal is required.

Parallel threads can be called BSPP or GAS threads, abbreviated as “G“. They are threads designed for gases. The internal and external threads of a parallel thread are sealed with the help of an O-ring to prevent fluid leakage.

Topa fitting BSPP


BSPT (British Standard Pipe Taper): Similar to NPT but with a 55-degree angle, BSPT threads provide a unique solution for specific needs. The tapered design allows for a more secure fit, making it suitable for high-pressure applications.

BSPT male threads are R series threads, while the female threads are called Rc series threads. They form a metal-to-metal seal when sealing and do not require the use of O-rings, although sealants are sometimes required.

BSPT Topa fitting


  ●Pitch: BSP threads are known for their distinct thread pitch, setting them apart from NPT threads. The specific pitch ensures a consistent fit across various fittings and applications.

  ●Angle: The 55-degree angle of BSP threads is a defining feature, contributing to their unique sealing properties. This angle provides a more gradual engagement between male and female threads, reducing the risk of over-tightening.

  ●Shape: Unlike the pointed peaks and valleys of NPT threads, BSP threads are rounded, offering a different sealing mechanism. This rounded design minimizes wear and tear, prolonging the lifespan of the connection.


  ●Adaptability: BSP threads are celebrated for their adaptability, suitable for a wide range of applications, from plumbing to industrial machinery.

  ●Efficiency: The unique design of BSP threads ensures a secure and leak-proof connection, enhancing the overall efficiency of the system.

  ●Compatibility: Understanding their compatibility is crucial, as mismatches with NPT threads can lead to leakage or failure under pressure. Careful selection and alignment are essential to prevent potential issues.


British Standard Pipe (BSP) threads are renowned for their precision and dependability, yet they come with certain limitations that might be relevant in particular scenarios:

  ●Potential Leakage: The characteristic rounded peaks and valleys of BSP threads can be both a strength and a weakness. While they offer unique sealing properties, if not correctly sealed, they might not provide a robust metal-to-metal contact. This could lead to potential leakage, a concern, especially in applications involving high pressure.

  ●Limited Availability in Certain Regions: While BSP threads are standard in many parts of the world, they may be less common in areas where NPT threads prevail, such as the United States and Canada. This limited availability might lead to delays in procurement or an increase in costs, affecting project timelines and budgets.


  ●Manufacturing: In manufacturing facilities, BSP threads are a preferred choice for professionals seeking precision and reliability. Their adaptability makes them suitable for various machinery and equipment.

  ●Oil and Gas: BSP threads are widely used in the oil and gas industry, where high-pressure applications demand secure and reliable connections.

  ●Automotive: In the automotive sector, BSP threads are used in fuel lines, hydraulic systems, and other critical components, ensuring optimal performance and safety.

  ●Construction: In construction equipment, BSP threads provide robust connections that can withstand the rigors of heavy-duty use.

NPT Pipe Threads

National Pipe Threads (NPT) are synonymous with quality and precision in the U.S. and Canada, and with a 60-degree angular taper, NPT threads have become the preferred choice for pressure calibration systems in North America. The standard has been a cornerstone of the hydraulic industry, reflecting a commitment to innovation and excellence.

Types of NPT Threads


NPT (National Pipe Taper Thread)threads have a 60-degree thread angle and are tapered threads designed to form a tight seal for a variety of applications. The taper of the threads provides a stronger fit and is suitable for high-pressure applications. However, NPT threads typically require sealing compound or PTFE tape to ensure a leak-proof connection. They are commonly used in plumbing, industrial manufacturing, and oil and gas exploration.

NPT threads also have a derivative thread, NPTF threads. NPTF threads improve the thread standard and sealing than NPT threads. Therefore, NPTF provides a stronger seal and a more secure connection.

NPT Fitting drawing Topa


Unlike NPT, NPS(National Pipe Straight Thread)threads are straight rather than tapered. This design is not as self-sealing as NPT threads, so a gasket or washer is usually required for sealing. nps threads are typically used in applications that do not require a leak-proof seal, such as some low-pressure applications or where a jam nut is used to secure the connection. The straight thread design makes them more suitable for connections that require frequent disassembly and reassembly with less risk of thread wear.

NPS fitting drawing Topa


  Pitch: NPT threads are known for their specific thread pitch, distinct from BSP threads. This unique pitch ensures a consistent and secure fit across various applications.
  Angle: The 60-degree angle of NPT threads is a defining feature, contributing to their unique sealing properties. This angle allows for a more gradual engagement, reducing the risk of over-tightening.
  Shape: Unlike the rounded peaks and valleys of BSP threads, NPT threads are pointed, offering a metal-to-metal contact that ensures an excellent seal. This design enhances the connection’s durability and longevity.


  ●Readily available: NPT threads are readily available in a wide range of sizes and materials and are easily found in supplier inventories, making them a convenient choice for a variety of industries.

  ●Versatile: Suitable for a wide range of applications at different pressures, NPT threads are flexible and adaptable to meet a wide range of needs.

  ●Easy assembly: Metal-to-metal contact provides an excellent seal, making assembly simple and efficient, saving time and resources.


  ●Deformation: Relying on thread deformation for sealing limits its use in applications that require frequent disassembly, which may shorten its life.

  ●Potential Leakage: Improper alignment, over-tightening, or miss-sizing can lead to cracks and leaks, making NPT threads unsuitable for use in very high-pressure applications. Proper installation and maintenance are essential to minimize these risks.


  ●Industrial Manufacturing: NPT threads are widely used in manufacturing equipment where precision and reliability are critical. They are adaptable to a wide range of machinery and equipment.

  ●Oil and Gas Exploration: In the demanding environment of oil and gas exploration, NPT threads provide a robust connection that can withstand high pressures and harsh conditions.

  ●Automotive: NPT threads are vital in automotive manufacturing for fuel lines, hydraulic systems, and other critical components to ensure safety and performance.

  ●Construction: In construction equipment and large infrastructure projects, NPT threads provide a robust connection that can withstand heavy-duty use.


BSP and NPT threads differ in geographical usage, thread forms, angles, and pitches. While NPT threads are prevalent in North America, BSP threads are the standard across other regions. Their incompatibility emphasizes the importance of precise selection, as mismatches can lead to leakage or failure.

Regional Usage

BSP and NPT threads are more than just technical specifications; they represent regional preferences. NPT threads are common in the United States and Canada, while BSP threads are the dominant standard in the United Kingdom, Europe, Asia, Australia, and many other countries. This geographical difference emphasizes the importance of selecting the correct thread type for a particular market and application.

Thread forms and angles

The physical differences between inch and hexagonal threads are subtle and significant; NPT threads have pointed crests and valleys, whereas inch threads are rounded. In addition, NPT threads are angled at 60 degrees while BSP threads are angled at 55 degrees. These differences in shape and angle contribute to their unique sealing properties and applications. They also affect the compatibility and interchangeability of these threads and require careful consideration during design and assembly.

BSP vs NPT threads Topa

Thread Pitch Comparison

Another important difference between inch and American threads is the thread pitch. For many fractional pipe sizes, the thread pitch is different from NPT. The difference in pitch can lead to thread misalignment, fluid leaks, and even catastrophic failure under pressure. Understanding these nuances is critical for professionals in the hydraulics industry, as it helps in selecting the correct thread type for a particular application.

BSP size chart Topa
BSP thread size chart
NPT size chart Topa
NPT thread size chart

Incompatibilities and Implications

BSP and NPT threads are not interchangeable due to their different shapes, angles, and pitches. Attempting to screw NPT male threads into BSPP female threads can lead to problems such as leakage and failure. This incompatibility highlights the importance of expertise and precision in selecting and using the correct thread type. It also highlights the need for standardized practices and guidelines to ensure safety and performance.

Impact on industry practices

Comparisons between British and American threads are not limited to technical aspects; they also influence industry practices and standards. From manufacturing to maintenance, the choice between BSP and NPT threads affects the design, function and efficiency of hydraulic systems. It also affects component availability, supplier relationships and overall cost considerations.


For professionals in the hydraulics industry, it is critical to understand the uniqueness, compatibility and applications of NPT and BSP threads. Whether it’s the adaptability of the BSP thread or the efficiency of the NPT thread, these systems play a vital role in a variety of industries, from manufacturing to oil and gas exploration. They must be selected and utilized with expertise and precision to ensure optimal performance, safety, and reliability.

For more detailed information on BSP and NPT hydraulic fittings and adapters or to make an inquiry, you are welcome to contact Topa and we will address your concerns.

BSP Interlock Fitting

BSP Interlock Fitting

BSP interlock fitting has a 60° cone seat on female end and a 60° chamfer on male end. This type of interlock fitting can be use to connect 4SH and SAE 100R13  hydraulic hoses. 

If you have any questions of interlock BSP hose fittings, please contact us!

12613 interlock BSP firttingTopa

12613 BSP interlock fitting

13013 interlock BSPT fitting Topa

13013 BSP interlock fitting

22613 interlock BSP fitting Topa

22613 BSP interlock fitting

22643 interlock BSP fitting Topa

22643 BSP intrlock fitting

22693 interlock BSP fitting Topa

22693 BSP interlock fitting

BSP Interlock Fitting Video

This video is about the details of Topa BSP interlock fitting.

Interlock BSP fittings are made of high-quality carbon steel, and stainless steel. Those fittings can be applied in high-pressure hydraulic systems.

Please contact with us if you have any questions about hydraulic BSP fitting or other products.

Interlock Hose Fitting Catalog

This catalog is about interlock hose fittings.

Topa can offer all kind of hydraulic interlock hose fittings, and our catalog also including all of them.

Please contact us If you need more information of hydraulic hose fittings, or would like some free samples.

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Interlock Hose Fittings

Interlock Hose Fittings Factory in China

                     ※ High-temperature resistance

                     ※ High-pressure resistance

                     ※ Corrosion-resistance

                     ※ Durable

Interlock Hose Fittings Manufacturer in China

Interlock hose fittings provide a safe and leak-free connection between hose and machinery in high pressure environments. Topa’s interlock hose fittings are in strict compliance with international standards and are available upon request!

Interlock Hose Fittings Product List

Topa offers a full range of internlock fittings, including metric interlock fittings, BSP interlock fittings, NPT interlock fittings, JIC interlock fittings, flange interlock fittings, and JIS interlock fittings. Our fittings can meet all your needs, please contact us for more information!

BSP interlock hose fitting

BSP thread interlock fitting, straight/45-degree/90-degree.

JIC interlock hose fitting

JIC thread interlock fitting, straight/45-degree/90-degree.

NPT interlock hose fitting

NPT thread interlock fitting, for use with hydraulic hoses.

Metric interlock hose fitting

Metric thread interlock fitting, straight/45-degree/90-degree.

Flange interlock fitting

Code 61/62, 9000psi interlock fitting, straight/45-degree/90-degree.

Interlock hose ferrule

Interloc hose ferrule, for use with interlock hose fittings.

Interlock double connector

Double connector interlock hose fitting is usually used to connect two hoses.

Interlock Hose Fittings Video

This video is about tube cutting, cold bending, packaging, and other steps of hydraulic tube assemblies. You can click this video to check more details. If you want to know more information, please contact us.

Topa hydraulic fittings

Topa, as the best manufacturer of hydraulic fittings, has perfect production, quality inspection, and packaging processes to meet all customers’ needs. And Topa can also provide custom hydraulic fittings, welcome to order.

Your Reliable Interlock Hose Fittings Manufacturer

Interlock fittings are used in conjunction with multi-layered wire hydraulic hoses for use in high-pressure hydraulic environments, and Topa’s interlock fittings include a variety of threads and models to meet all your needs.

Interlock fittings are available in stainless steel, carbon steel and steel, depending on the environment in which they are used. However, the quality of all of our fittings is up to standard and you can order with confidence.

Advantages of Topa interlock fittings:

  • Durable
  • High pressure resistance
  • High quality
  • Affordable price
interlock fittings manufacturer process

Why choose us

As a manufacturer of hydraulic fittings, Topa can supply high quality hydraulic fittings to all customers. We have a wide range of fittings, including brake fittings, hose fittings, brass fittings, and adapters. These hydraulic fittings are available in both quality and quantity to meet your needs.

Topa can provide excellent customer service. From the moment you start asking for a quote, our staff will provide the highest quality service. You can ask all your doubts and our salesmen will propose a solution in the shortest possible time.

Topa factory performs quality tests on all fittings. We test the hardness, corrosion resistance, pressure resistance, and appearance of the fittings. We have professional testing equipments and will test them according to international standards. If you need a test report, you can contact our staff.

Topa can provide custom services. If you need a special customized fitting, you can provide detailed drawings and parameters, and our professional technicians will arrange production for you.


Interlock Hose Fittings Application

Interlock fittings can be used in high pressure hydraulic systems, where the end is divided into two areas: one for locking and the other for sealing. This type of fitting is popular because it ensures the smoothness and tightness of the hydraulic system. They are used in applications such as mining, plant, oil and gas, and aerospace.

oil and gas interlock fittings

Oil and gas

Hydraulic interlock hose fitting are resistant to high pressure and high temperature and are not easily corroded by fluids after special treatment.

industry interlock fittings Topa


Interlock hose fittings can be used in fixed or narrow positions in major hydraulic applications in factories. They can provide a leak free seal.

oil and gas interlock fittings


Mining application needs high-pressure resistance and durale interlock fittings, and Topa can offer all kinds of interlock hose fittings.

Quality Control​


What is an interlock fitting?

An interlock fitting is a special type of hose fitting.

Why do I need an interlock fitting?

Interlock fittings can be used in high pressure environments without leaks.

What kind of hoses can be used with interlock fittings?

4SH and SAE 100R13 multi-layer steel wire braided hoses.

What are the advantages of interlock fittings?


Interlock fittings can withstand high pressure, are resistant to wear and tear, and have a strong seal.

What materials are interlock fittings available in?

Carbon steel, stainless steel and steel.

What applications require the use of interlock fittings?

All applications where multiple layers of steel braided hose are used.

What threads are available for interlock fittings?

NPT, BSP, JIC, and JIS threads.

Can we customize interlock fittings?

Yes, please provide detailed parameters.

Do you have interlock fittings in stock?

No, but we will arrange production as soon as possible.

How long does it take to make an interlock connector?

Normally, 30-45 days.

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measure hydraulic fittings Topa

How to Measure Hydraulic Fittings

How to Measure Hydraulic Fittings?

Welcome to this all-inclusive guide on measuring hydraulic fittings, a crucial task that demands precision and expertise. Whether you’re a seasoned hydraulic salesperson or a maintenance professional, this guide is designed to walk you through the entire process. From selecting the right tools to understanding the significance of each measurement, we’ve got you covered. We’ll also shed light on common mistakes that can compromise your hydraulic system’s integrity. So let’s dive in and set the stage for a hydraulic system that’s both reliable and efficient.

Table of Contents

Tools Required for Accurate Measurements

When it comes to measuring hydraulic fittings, you can’t afford to skimp on tools. The right tools not only make the job easier but also ensure that you get accurate and reliable measurements. Here’s what you’ll need:


hydraulic fittings measure tools Topa

Calipers or Measuring Tape

These are your go-to tools for measuring the diameter of the threads. Calipers are more precise, but a good-quality measuring tape can also do the job.

Thread Pitch Gauge

This tool is essential for determining the thread pitch, which is the distance between the threads. A wrong pitch can lead to incompatible fittings, so don’t overlook this.

Reference Charts

These charts contain standard sizes and dimensions for various types of hydraulic fittings. They’re a quick way to cross-reference your measurements.


Protractors can be used to measure the angles of hydraulic fittings. The commonly fitting elbows are 30-degree, 45-degree, and 90-degree elbows, and there also exist other elbows. Special gauges are available to measure the angle of the sealing surface inside and outside of the fitting, such as 37-degree cone, 45-degree cone, and 30-degree cone.

Precautions to Take Before Measuring

Before you even touch a caliper or gauge, there are some precautions you need to take:

Depressurize the System: Always make sure the hydraulic system is off and depressurized. This is not just for your safety but also for accurate measurements.

Wear Safety Gear: Put on your gloves and safety glasses. It’s better to be safe than sorry.

Clean the Fitting: Dirt and debris can affect your measurements. Make sure the fitting is clean before you start.

Basic steps for measuring hydraulic fittings

Step 1: Determine the type of hydraulic fittings

hose fitting or adapter Topa
parallel or tapered Topa

First, you need to determine the types of hydraulic fittings. Is it a hose fitting or an adapter?

Before considering measurements, you need to determine the type of hydraulic fittings to be used. This step is critical because each fitting type has its own set of specifications and compatibility requirements. Whether you are an experienced hydraulic salesperson or a maintenance professional, knowing the type of fitting is the foundation for the work that follows.

There are several types of hydraulic fittings, each with its own set of standards. The most common types are JIC (Joint Industry Committee), NPT (National Pipe Thread), and ORFS (O-ring Face Seal). These are not just random acronyms, but industry standards that define the shape, thread, and function of the fitting.

So how do you recognize the type of fitting? First, check the fitting itself for any markings. Manufacturers usually print markings on the fitting type so that it is straightforward to identify. For example, in general, a US fitting will have two scores on it, whereas an imperial will only have one. If not, consult the manufacturer’s guide or specification sheet.

Why is this step so important? Using the wrong type of fitting can lead to a host of problems, from small leaks to catastrophic system failure. For example, NPT fittings may look similar to BSPT fittings, but they have different thread patterns and sealing methods. Mixing them up can be a recipe for disaster.

In short, determining the type of fitting is not only the first step, it’s a critical one. It sets the stage for all subsequent steps, from measurement to installation. So take your time, utilize the resources available, and make sure it’s correct. This is one area where you can’t rely on guesswork.

Step 2: Measuring thread diameter

id measure Topa
od measure Topa

Once the type of fitting has been determined, the next critical step is to measure the thread diameter. This may seem like a simple task, but it is both difficult and important. Thread diameter is a key factor in ensuring that hydraulic fittings are compatible with the rest of the system. Mismatched fittings can lead to leaks, inefficiency, and even system failure.

For this, you need a reliable measuring tool. Calipers are the most recommended standard tool in the industry, with accuracy to suit everyone’s needs. However, a high-quality tape measure can also do the job. Choosing between the two usually depends on the accuracy you need and the tools you have on hand.

For male threads, you need to measure the outside diameter. Place the caliper at the widest part of the thread, making sure it’s snug against the thread, but not so tight as to distort the thread. For female threads, the process is similar, but you are measuring the ID. Insert the caliper into the fitting and expand the caliper until it touches the inside wall.

Here’s a pro tip: Always double-check your measurements. Even the most experienced professionals can make mistakes, and in hydraulics, even a one-millimeter error can cause problems. Take several readings and then use the average value as the final measurement.

Why is this step so important? Because thread diameter directly affects a fitting’s ability to form a secure, leak-proof connection with the hose or component it connects to. Getting this wrong can jeopardize the integrity of the entire hydraulic system, not just a quick fix.

In short, measuring thread diameter should not be taken lightly. It requires precision, the right tools, and a double-checking mindset. Getting this right sets the stage for a reliable and efficient hydraulic system.

Step 3: Determining thread pitch

plug gauge Topa
ring gauge Topa

After measuring the thread diameter, the next critical step is to determine the thread pitch. Thread pitch is a critical factor in ensuring compatibility and a leak-free system. Thread pitch is essentially the distance between individual threads, measured in threads per inch (TPI). A mismatch in thread pitch can result in a poor fit, causing leaks and even damaged threads.

To measure thread pitch, you need a specialized tool called a thread pitch gauge. This tool comes with a variety of inserts, each labeled with a different TPI value. To use it, simply align the blades with the threads of the fitting until you find an exact match. This will give you the TPI value of the fitting.

Now, you may ask, what’s so important about this? Even if two fittings have the same diameter, differences in thread pitch can cause them to be incompatible. For example, a 14 TPI 1-inch NPT fitting will not fit a 12 TPI 1-inch NPT fitting. The threads won’t line up and you’ll either end up with a loose connection or damage the threads by forcing them together.

Here’s a pro tip: Always double-check the thread pitch measurement. A small mistake here can lead to big problems. If necessary, take several readings and confirm the TPI according to the manufacturer’s specifications whenever possible.

In hydraulics, it’s all in the details, and thread pitch is one detail that should not be overlooked. It’s not just about making sure you tighten the joint, it’s about ensuring a secure, long-lasting connection that won’t fail under pressure.

Step 4: Measuring seat angles

Once the thread diameter and pitch have been determined, it’s time to focus on another critical aspect: the seat angle. Seat angle is often overlooked, but it plays a critical role in ensuring a leak-proof connection. The angle is the inclination of the fitting seat as it interacts with its mating parts. Mismatched seat angles can lead to leaks, reduced system efficiency, and even component damage.

To measure the seat angle, you need to use a protractor or an angle-measuring tool designed for hydraulic fittings. Place the tool on the fitting seat and read the angle. The process is simple and straightforward but requires precision. One degree of deviation can compromise the integrity of your hydraulic system.

The seat angle determines how well the fitting seals against its mating parts. A perfect fit creates a leak-proof seal that can withstand high pressures and harsh conditions. Conversely, a mismatch can lead to leaks, which can be not only a nuisance but also a serious operational hazard. Leaks can lead to hydraulic fluid depletion, increased maintenance costs, and even, in extreme cases, system failure.

Here’s a pro tip: Always check seat angle measurements against the manufacturer’s specifications. This double-checking ensures that you are doing it correctly and helps you avoid costly mistakes.

In short, measuring the seat angle is a step that cannot be skipped or rushed through. It requires the right tools, consistent operation, and a meticulous attitude. Giving seat angle the attention it deserves not only ensures a leak-free connection but also improves the overall reliability and efficiency of your hydraulic system.

So the next time you choose a hydraulic fitting, don’t just focus on the threads. Give due attention to the valve seat angle as well. This small detail can have a major impact on the performance and reliability of your hydraulic system.

Step 5: Measuring fitting length

length measure Topa
hose fitting length

When it comes to hydraulic fittings, length is often the forgotten dimension. While thread diameter, pitch, and seat angle get all the attention, fitting length is just as critical to system performance and safety. Incorrect length can lead to improper sealing, increased stress on the fitting, and even system failure.

To measure fitting length, you’ll need a reliable measuring tool such as a caliper or straightedge. Align the tool with the joint, starting at one end and extending all the way to the other. Make sure you measure the entire length, including any flanges or extensions that may be part of the joint. You can’t use approximations for this step; accuracy is key.

Length directly affects a fitting’s ability to form a secure connection. Too short, and there’s a risk of an incomplete seal, leading to leaks. Too long, and it puts too much pressure on the joint and connecting parts, potentially leading to cracks or breaks over time.

Step 6. Cross-referencing measurement results

hydraulic fitting size chart Topa

You’ve measured thread diameters, determined thread pitches, checked seating angles, and even verified joint lengths. But there’s one more critical step before you continue with the installation: cross-referencing the measurements. In this step, you take out your reference charts and double-check that each measurement meets industry standards and your specific needs.

Even small differences in measurements can lead to serious problems. Cross-referencing is the final quality check to ensure that the fittings you’re about to install are the correct fittings for your hydraulic system. It’s the last line of defense against leaks, inefficiencies, and potential system failures.

To cross-reference, compare your measurements to the data on a reference chart. These charts often include standard sizes, thread types, and dimensions for various hydraulic fittings. Make sure your fitting measurements match the types and sizes listed. If they don’t match, you’ll have to redesign.

Here’s a pro tip: Always have the latest reference charts on hand. Manufacturers occasionally revise specifications, and using outdated information can lead to errors.

In conclusion, cross-referencing measurements is not only a best practice but a necessity for anyone who values the reliability and safety of their hydraulic systems. It’s the final step in confirming that you’ve done your due diligence to ensure that the fittings you install today won’t cause problems tomorrow. Taking the time to cross-reference sets the stage for a durable hydraulic system.

Common Mistakes to Avoid

When it comes to hydraulic fittings, there is very little margin for error. Even seasoned professionals can make mistakes that compromise the integrity of the system. Here are some common mistakes to watch out for:

● Over-tightedning fittings

It’s a common misconception that the tighter you tighten, the better. Over-tightening hydraulic fittings can distort their shape, which can lead to leaks and even component failure. The key is to find a proper position so that the joint is firm but not stressed. Always use a torque wrench and follow the manufacturer’s torque specifications to avoid this mistake.

● Using incompatible thread types

In the world of hydraulics, not all threads are created equal. Using an incompatible thread type can definitely lead to failure. Always double-check that the threads of the fitting match the threads of the connected component. A mismatch can lead to leaks, inefficiency and even catastrophic failure.

● Improper use of sealing methods

Sealing is an art in itself. Using the wrong sealing method or material can compromise the integrity of your hydraulic system. Always follow the manufacturer’s instructions when using a sealing method. Whether it’s a thread sealant or an o-ring, using the correct sealing method is critical to a leak-proof connection.


The Comprehensive Guide to Measuring Hydraulic Fittings is a great resource for professionals in the hydraulic industry. It covers the entire process from the required tools to the final cross-referenced measurement. The guide emphasizes the importance of each step and highlights common mistakes to avoid. By following these guidelines, you can ensure optimal performance and safety of your hydraulic system. If you only have old fittings and are not sure about the measured data, then you are welcome to contact us and we can give you an accurate answer!

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