Hydraulic Fitting Types The Comprehensive Guide Topa

Hydraulic Fitting Types

The Comprehensive Guide to Hydraulic Fitting Types

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Comprehensive Guide

A comprehensive guide to hydraulic fitting types can help you learn more about threads such as JIC, BSP, SAE, JIS and NPT. This guide provides clear and practical advice to help you choose the right fitting for your hydraulic system. This guide all ensures that you have the knowledge you need to make informed decisions and maintain efficient, reliable operation.

JIC fitting introduction Topa

Chapter 1

What are JIC Hydraulic Fittings?

understanding BSP hydraulic fittings

Chapter 2

Understanding BSP Hydraulic Fittings

Metric hydraulic fittings:The comprehensive guide

Chapter 3

Metric Hydraulic Fittings: The Comprehensive Guide

What is ORS Hydraulic Fitting

Chapter 4

What is ORS Hydraulic Fitting?

What is DIN Hydraulic fitting Topa

Chapter 5

What is DIN Hydraulic Fitting?

what is an orb hydraulic fitting Topa

Chapter 6

What is An ORB Hydraulic Fitting

JIC vs AN What's the difference

Chapter 7

An vs JIC Hydraulic Fittings: What's the Difference

BSP vs NPT title Topa

Chapter 8

BSP and JIC Hydraulic Fittings

What Does SAE Stand for in Hydraulic Fittings Topa

Chapter 9

What Does SAE Stand for in Hydraulic Fittings?

Pipe Thread vs Straight Thread Hydraulic Fittings

Chapter 10

Pipe Thread vs Straight Thread Hydraulic Fittings


Chapter 11

JIC vs NPT Fittings: The Ultimate Guide


Chapter 12

SAE vs JIC Hydraulic Fitting: What's the Difference

BSP vs NPT title Topa

Chapter 13

BSP VS NPT Threads:What are the Differences?


Chapter 14

UNC vs UNF Fittings: What is the Difference?

Your Questions?

Confused about the content of the article? Have any suggestions? Contact us and Topa will get back to you as soon as possible!

What is ORS Hydraulic Fitting

What is ORS Hydraulic Fitting: A Comprehensive Guide

What is ORS Hydraulic Fitting: A Comprehensive Guide

Table of Contents


Hydraulic fittings are the centerpiece of a hydraulic system, and among them, ORS fittings also play an important role. ORS refers to fittings that contain an o-ring that is secured in a groove and pressed to form a tight seal during assembly. We will discuss their design, function and role in hydraulic systems. In addition, we’ll discuss how to select the right ORS fitting for your needs and highlight factors to consider to ensure optimal performance and service life.

The Basics of ORS Hydraulic Fittings

Definition and Functionality

An ORS (O-Ring Seal) hydraulic fitting is a component used in hydraulic systems to ensure a tight and secure connection between different parts of the system. These fittings play a critical role in maintaining the integrity of the hydraulic system by preventing leaks, which could lead to system failure or decreased efficiency. The effectiveness of ORS hydraulic fittings lies in their ability to create a robust seal, crucial for systems handling high pressures and varying temperatures.

Design Features

The hallmark of ORS hydraulic fittings is the incorporation of an O-ring seal along with metal-to-metal contact. The O-ring, usually made of rubber or a similar flexible material, is seated in a specifically designed groove. When the fitting is assembled, the O-ring gets compressed, forming a tight seal that prevents fluid from leaking. The metal-to-metal contact further enhances this sealing capability, ensuring a reliable connection even under high pressure. This combination of features is vital in hydraulic systems where even a minor leak can lead to significant issues.

Types of ORS Fittings

ORS hydraulic fittings come in various types, each designed for specific applications and requirements. Some common types include adjustable, crimp, and swivel fittings, among others. Adjustable fittings allow for ease of installation and alignment, while crimp fittings are known for their robustness and are often used in high-pressure applications. Swivel fittings provide flexibility, enabling movement without compromising the integrity of the connection. Understanding these types and their unique features is key to selecting the right fitting for a specific application.

Compatibility and Uses

ORS fittings are versatile and compatible with a wide range of hydraulic hoses and tubes. This compatibility is crucial in diverse applications, from industrial machinery to automotive systems. For instance, in construction equipment, ORS fittings might be used for their ability to withstand vibrations and shocks, while in automotive applications, their compact size and leak-proof nature are more valued. The choice of an ORS fitting depends on several factors, including the type of fluid being transported, the operating pressure, and environmental conditions.

Types and Variations of ORS Fittings

ORS hydraulic fittings are integral components in various hydraulic systems, and understanding their types and variations is crucial for selecting the appropriate fitting for specific applications.

The different types of ORS fittings include:

1. Standard ORS Fittings: These are the most common types used in general hydraulic applications. They are known for their robust construction and effectiveness in preventing leaks.

2. Adjustable ORS Fittings: These fittings offer flexibility in installation, allowing for adjustments to be made for proper alignment and sealing.

3. Swivel ORS Fittings: Designed to provide rotational movement, these fittings are ideal in applications where hoses and tubes need to move without twisting or kinking.

4. Bulkhead ORS Fittings: Used in applications where hoses or tubes need to pass through a panel or bulkhead, maintaining a leak-proof seal.

5. Elbow and Tee ORS Fittings: These fittings are used to change the direction of the hydraulic lines or to branch out connections, respectively.

Identifying ORS fittings typically involves examining the characteristics of the O-ring seal and the threading. ORS fittings have a flat face for the O-ring to seat and a threaded section for connection. The presence of a visible O-ring is a distinctive feature in identifying these fittings.

In comparison to other hydraulic fitting types, such as JIC (Joint Industry Council) and NPT (National Pipe Thread), ORS fittings have some distinct differences. JIC fittings are known for their 37-degree flare seating surface, which differs from the flat face of ORS fittings. NPT fittings, on the other hand, have tapered threads and do not use an O-ring for sealing, unlike the ORS fittings. These differences are important in determining the right fitting type for specific pressure ratings and applications.

Understanding the types, identification methods, and comparative features of ORS hydraulic fittings aids in making informed decisions in hydraulic system design and maintenance.

Advantages of Using ORS Hydraulic Fittings

ORS hydraulic fittings, known for their robustness and efficiency, offer several advantages making them a preferred choice in various hydraulic applications.

Leak Prevention

One of the primary benefits of ORS fittings is their exceptional ability to prevent leaks. The O-Ring seal in these fittings provides a tight and secure connection, ensuring that hydraulic fluid is contained within the system. This is especially critical in systems where even a small leak can lead to significant operational issues or safety hazards.

Pressure Resistance

ORS fittings are designed to withstand high-pressure conditions, making them suitable for use in heavy-duty hydraulic systems. Their robust construction ensures that they can handle the stress and strain of high-pressure applications without failing, ensuring the reliability and longevity of the hydraulic system.


Constructed with high-quality materials, ORS fittings are built to last. They are resistant to wear and tear, which is essential in systems that are in constant use or exposed to harsh environments. Their durability translates into less frequent replacements, reducing downtime and maintenance costs.

Advantageous in Specific Scenarios

In scenarios such as mobile hydraulics, agricultural machinery, and industrial applications, the advantages of ORS fittings are particularly evident. Their ability to maintain a leak-proof seal in dynamic and vibrating environments makes them indispensable in these sectors. In mobile hydraulics, for instance, the constant movement and vibration could compromise the integrity of a hydraulic system, but ORS fittings maintain a secure connection, ensuring the smooth operation of the machinery.

Technical Specifications of ORS Fittings

The technical specifications of ORS (O-Ring Seal) hydraulic fittings are crucial for ensuring proper functionality and compatibility within hydraulic systems.

Sizes, Pressure Ratings, Materials

ORS fittings come in a range of sizes to accommodate various hydraulic hose and tubing diameters. The size of the fitting is typically correlated with the inner diameter of the hose or tube it is meant to connect. Pressure ratings for ORS fittings vary, with some designed to handle extremely high pressures, making them suitable for industrial and heavy machinery applications. The materials used in ORS fittings include steel, stainless steel, and brass, each chosen for its durability and resistance to corrosion and wear. The selection of material depends on the specific application, considering factors like the type of hydraulic fluid, environmental conditions, and pressure requirements.

Understanding Standards

ORS fittings are governed by specific standards, including SAE J1453 and various ISO standards. These standards outline the dimensions, tolerances, and performance requirements for ORS fittings. SAE J1453, for instance, specifies the dimensions for O-ring face seal fittings used in hydraulic tubing. Adhering to these standards is crucial for ensuring the fittings’ compatibility and performance in hydraulic systems.

Specification Sheets

Reading and understanding specification sheets is essential for selecting the right ORS fitting. These sheets provide detailed information about the fittings, including their size, material, pressure rating, and compliance with relevant standards. The specification sheet will also often include information about the O-ring material and its compatibility with different hydraulic fluids. Understanding how to interpret these sheets helps in making informed decisions when selecting fittings for a hydraulic system.

Installation Guide for ORS Hydraulic Fittings

Step-by-Step Instructions for Fitting Installation

Installing ORS hydraulic fittings correctly is crucial for the efficiency and safety of hydraulic systems. Here’s a step-by-step guide, common mistakes to avoid, and tips for a secure installation:

ORFS Hydraulic fittings installation

Step-by-Step Installation Guide


  1. Preparation: Before starting, ensure that all components are clean and free from debris. Check the fitting and tubing for any damage.
  2. Inspect the O-Ring: Make sure the O-ring is in good condition and properly seated in its groove on the fitting.
  3. Lubrication: Lightly lubricate the O-ring with a fluid compatible with the system to facilitate a smooth installation.
  4. Aligning the Fitting: Carefully align the ORS fitting with the tube or hose. Misalignment can cause the O-ring to pinch or tear.
  5. Hand Tightening: Initially, tighten the fitting by hand to ensure that the threads are correctly engaged.
  6. Final Tightening: Use appropriate tools to tighten the fitting to the manufacturer’s specified torque. Over-tightening can damage the O-ring, while under-tightening might lead to leaks.

Common Installation Mistakes

Overlooking O-Ring Inspection: Not inspecting the O-ring for damage or proper placement is a common oversight.

Cross-threading: Starting the fitting at an incorrect angle can lead to cross-threading, damaging both the fitting and the receiving port.

Incorrect Torque: Applying too much or too little torque can compromise the fitting’s integrity.

Tips for Secure and Leak-Free Installation

Follow Manufacturer Guidelines: Always adhere to the manufacturer’s installation instructions, especially regarding torque specifications.

Use Proper Tools: Employ the correct tools for installation to avoid damaging the fitting.

Regular Inspection: After installation, periodically inspect the fitting to ensure it remains secure and leak-free.

Correctly installing ORS hydraulic fittings ensures the longevity and reliability of hydraulic systems. Proper installation reduces the risk of leaks and potential system failures, contributing to overall operational efficiency.

Maintenance and Troubleshooting

Maintaining and troubleshooting ORS (O-Ring Seal) hydraulic fittings are essential to ensure the longevity and efficient performance of hydraulic systems.

Routine Maintenance Tips

  • Regular Inspection: Periodically inspect ORS fittings for signs of wear, corrosion, or damage. Pay special attention to the condition of the O-ring.
  • Cleanliness: Keep the fittings clean. Accumulated dirt and debris can compromise the integrity of the hydraulic system.
  • Check for Leaks: Regularly check for leaks around the fittings. Even small leaks can lead to significant issues over time.
  • Lubrication: Ensure that the O-rings are properly lubricated with a fluid that is compatible with the hydraulic system. This helps in maintaining a good seal and prolongs the life of the O-ring.
  • Tightening Check: Periodically check and retighten the fittings as needed, adhering to the manufacturer’s torque specifications.

Troubleshooting Common Issues

  • Leaks: If a leak is detected, first try tightening the fitting to the recommended torque. If the leak persists, inspect the O-ring for damage and replace it if necessary.
  • Decreased Performance: If there is a noticeable decrease in system performance, check for any obstructions or damages to the fittings that might be causing flow restrictions.
  • Unusual Noises: Sounds like whining or banging may indicate problems in the fitting connections. Inspect for loose fittings or air in the system.

When to Replace and Upgrade Your Fittings

  • Wear and Tear: Over time, fittings can wear out, especially in high-pressure environments. Replace fittings that show signs of significant wear.
  • System Upgrade: If the hydraulic system is being upgraded or modified, it may be necessary to replace ORS fittings to ensure they are compatible with the new system requirements.
  • Damage: Any visible damage, such as cracks or thread stripping, is a clear indication that the fitting should be replaced.

Maintaining and troubleshooting ORS hydraulic fittings are key practices that contribute to the efficiency and safety of the entire hydraulic system. Regular maintenance, coupled with timely troubleshooting and replacement, helps in avoiding system failures and prolongs the lifespan of the hydraulic components.

Purchasing Guide for ORS Hydraulic Fittings

When purchasing ORS hydraulic fittings, several factors should be considered to ensure you select the right components for your hydraulic system.

Quality Considerations

The quality of ORS fittings is paramount. When selecting these fittings, consider the material composition – stainless steel, brass, or carbon steel – each offering different levels of strength and corrosion resistance. Also, look at the manufacturing standards; fittings that meet or exceed industry standards like SAE J1453 or ISO standards are generally more reliable. Durability is another key factor; choose fittings that are known for their long-lasting performance, especially in challenging environments.

Size and Specifications

measure ORS Hydraulic fittings Topa

Choosing the right size and specification is crucial. The fitting must match the size of the hose or tube it is intended to connect. A mismatch can lead to leaks or system failures. Consider the inner and outer diameters of the hose or tube and the fitting’s thread size and type. The specifications should also align with the system’s pressure requirements and the type of fluid being transported.

Manufacturer Reputation

Opt for fittings from reputable manufacturers. Well-known brands are often synonymous with quality and reliability. Look for manufacturers who offer fittings that comply with international quality standards. Industry certifications or standards are good indicators of a manufacturer’s commitment to quality.

Assessing Needs

Before purchasing, assess the specific needs of your hydraulic system. Consider the operating pressure, the type of hydraulic fluid used, and environmental conditions like temperature and potential exposure to corrosive substances. Compatibility with existing system components is also critical to ensure seamless integration and operation.

By considering these factors, you can make an informed decision when purchasing ORS hydraulic fittings, ensuring the efficiency and reliability of your hydraulic system.


We delve into the basics of ORS fittings, outlining their design, function and different types. We also highlight their benefits. Understanding technical specifications, proper installation procedures, routine maintenance and troubleshooting are key to the optimal use of ORS fittings. Proper selection, installation and maintenance of hydraulic fittings can have a significant impact on the performance of these systems. We encourage readers to continue to explore and learn about hydraulic systems, and with a better understanding of components such as ORS fittings, you will be better able to ensure the smooth operation and longevity of your hydraulic system.

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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ORFS hydraulic adapters supplier in China

ORFS Hydraulic Fittings

ORFS Hydraulic Fitting

ORFS hydraulic adapters are parallel hydraulic fittings. O-ring face seal fittings have grooves on the male threads for the installation of an O-ring. The ORFS adapter has a groove on the male threads for the installation of an O-ring. These types of fittings can provide excellent leakage protection at high-pressure applications.

ORFS hydraulic fittings have different types, like union, elbow, tee, cross, bulkhead, and swivel fittings. And they can play an excellent role in the industry, construction, agriculture, marine, oil and gas applications.

FS2403 ORFS hydraulic fitting Topa


ORFS Union

FS2404 ORFS hydraulic fitting Topa


M ORFS to M Pipe

FS2405 ORFS hydraulic fitting Topa


M ORFS to Female Pipe



FS2501 ORFS hydraulic fitting Topa


90° M ORFS to M Pipe

FS2700 ORFS hydraulic fitting Topa


ORFS Bulkhead

FS6400 ORFS hydraulic fitting Topa


ORFS to O-ring


45° ORFS to O-ring

FS0304 ORFS hydraulic fitting Topa



ORFS Hydraulic Fitting Video

Topa is an excellent Chinese hydraulic adapters supplier, we provide the best-quality o-ring face seal hydraulic fittings. 

Topa offers all types and sizes of hydraulic adapters, and we also supply custom hydraulic adapters.

Our hydraulic adapters will undergo strict quality control, to ensure the quality of all hydraulic products.

If you have any problems with hydraulic ORFS fittings, please contact us!

JIC hydraulic adapters manufacturer catalog Topa

Topa Hydraulic Adapters Catalog

The catalog book of hydraulic fitting adapters includes all kinds of hydraulic adapters, as well as their detailed parameters. If you need more information about hydraulic adapters, please contact us!

As a professional hydraulic adapters manufacturer and supplier, Topa can offer the widest range of hydraulic adapters and our adapters can meet all your needs!


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hydraulic adapters manufacturer Topa in China

Hydraulic Adapters Manufacturer

Hydraulic Adapters Manufacturer

  • High-quality
  • Strength
  • Long-lasting 
  • Durable

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!

BSP hydraulic adapters supplier in China

BSP hydraulic adapters

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

hydraulic bulkhead adapters supplier

Hydraulic bulkhead

JIC, BSP, Metric thread hydraulic bulkhead adapters.

hydraulic plug adapters supplier in China

Hydraulic plug

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

Metric hydraulic adapters supplier in China

Metric hydraulic adapters

Metric hydraulic adapters, DIN standard adapters.

hydraulic tee adapters supplier in China

Hydraulic tee adapters

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

JIS hydraulic adapter supplier in China

JIS hydraulic adapter

JIS standard hydraulic adapters, Japanese standard adapter fittings.

hydraulic test adapter supplier in China

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.

Topa hydraulic adapters China manufacturer air plane


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.

Quality control​


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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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

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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

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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

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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

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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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