Understanding JIS vs JIC Fittings Your Ultimate Guide

Understanding JIS vs JIC Fittings: Your Ultimate Guide

Understanding JIS vs JIC Fittings: Your Ultimate Guide

Table of Contents


In the world of hydraulic systems, fittings play a crucial role in ensuring the efficiency and safety of fluid transfer. Among the numerous types of fittings available, JIS and JIC hydraulic fittings are commonly used but often confused due to their similar appearances. This guide aims to clarify the differences between JIS and JIC fittings, helping you make informed decisions for your hydraulic system needs.

What are JIS Fittings?

JIS fittings, standardized by the Japanese Industrial Standards (JIS), play a crucial role in hydraulic systems, particularly within Japanese machinery and equipment. The Japanese Industrial Standards Committee (JISC) oversees these standards to ensure quality, safety, and interoperability. JIS fittings are renowned for their precision, reliability, and widespread use in various industries, including automotive, construction, and manufacturing.

Design and Construction

JIS fittings are designed with a 30-degree flare seating surface and metric threads. This unique design ensures a secure and leak-proof connection, which is essential for maintaining the integrity and efficiency of hydraulic systems. The 30-degree flare provides an effective sealing surface, reducing the risk of fluid leakage under high pressure and temperature variations.

International Standard

JIS fittings adhere to international standards, ensuring they meet rigorous quality and safety benchmarks. These standards facilitate global compatibility and interoperability, making JIS fittings a preferred choice in international markets. Compliance with international standards also means that JIS fittings can be integrated seamlessly with other globally recognized systems, enhancing their versatility and applicability.

Relevant Standards:

JIS B 8363: This standard specifies the dimensions, materials, and performance requirements for JIS hydraulic fittings.

ISO 8434: The International Organization for Standardization (ISO) often aligns its standards with JIS, ensuring compatibility and standardization across different regions.

Regional Usage

JIS fittings are predominantly used in Japan and regions with significant Japanese machinery and automotive industry presence. However, their use extends globally due to Japan’s strong influence in various industries. In addition to Japan, countries like China, South Korea, and Taiwan, with robust manufacturing sectors, extensively use JIS fittings. These fittings are crucial in automotive manufacturing, heavy machinery, and industrial hydraulics.


JIS fittings are widely used in various applications due to their reliability and compatibility with metric systems.

Automotive Industry: Used in hydraulic brake systems, fuel lines, and other fluid transfer applications in vehicles.

Construction Equipment: Essential in hydraulic systems of construction machinery like excavators, loaders, and cranes.

Industrial Machinery: Integral in manufacturing equipment, including presses, molds, and automated systems.

Agriculture: Employed in hydraulic systems of tractors, harvesters, and other agricultural machinery.

What are JIC Fittings?

JIC fittings, standardized by the Joint Industry Council (JIC), are a staple in hydraulic systems, particularly within North American and international markets. These fittings are designed to meet the rigorous demands of high-pressure hydraulic applications. The Joint Industry Council, comprising various industry leaders, established these standards to ensure consistency, reliability, and safety in hydraulic systems. JIC fittings are widely recognized for their durability, ease of assembly, and robust sealing capabilities.

Design and Construction

JIC fittings feature a 37-degree flare seating surface and Unified National Fine (UNF) threads. This design ensures a strong, leak-proof connection that can withstand high pressures and demanding conditions. The 37-degree flare angle is particularly effective in creating a tight seal, which is crucial for maintaining system integrity under varying pressure and temperature conditions.

Key Features:

37-Degree Flare: This specific flare angle provides an optimal sealing surface, ensuring a leak-free connection even under extreme pressures.

UNF Threads: The Unified National Fine thread pattern is a standard in North American and many international hydraulic systems, facilitating compatibility and ease of assembly.

Materials: Typically manufactured from high-strength materials such as stainless steel, carbon steel, and brass, JIC fittings are designed to endure harsh environments and corrosive fluids.

International Standard

JIC fittings conform to international standards, ensuring they meet high-quality and safety benchmarks. This compliance allows JIC fittings to be used globally, providing a reliable option for various hydraulic applications across different industries.

Relevant Standards:

SAE J514: This Society of Automotive Engineers (SAE) standard specifies the dimensions, performance requirements, and testing procedures for JIC fittings.

ISO 8434-2: The International Organization for Standardization (ISO) has standards that align with JIC specifications, ensuring compatibility and global standardization.

Regional Usage

JIC fittings are predominantly used in North America but have a strong presence in international markets due to their reliability and versatility.

North America: Widely used across various industries, including automotive, aerospace, agriculture, and heavy machinery. The standardization and availability of JIC fittings make them a preferred choice.

Europe: Employed in sectors such as hydraulics and pneumatics, particularly where American machinery is used.

Asia: Increasingly used in markets that interact with North American machinery and technology, including China and India.

Key Differences Between JIS and JIC Fittings

Thread Type and Pitch

JIS Fittings:

Thread Type: JIS (Japanese Industrial Standard) fittings use metric threads. The threads are designed to meet specific metric standards, which are widely used in Japan and other regions that follow the metric system.

Thread Pitch: The pitch of JIS threads refers to the distance between threads and is measured in millimeters. JIS threads have a finer pitch compared to some other standards, which allows for precise adjustments and tight connections in hydraulic systems.

JIC Fittings:

Thread Type: JIC (Joint Industry Council) fittings use Unified National Fine (UNF) threads. These threads are standardized in North America and are characterized by their fine threading, which provides a strong and secure connection.

Thread Pitch: The pitch of UNF threads is measured in threads per inch (TPI). JIC threads typically have a higher TPI, meaning they are more closely spaced than standard threads, which enhances the strength and integrity of the connection.

Sealing Mechanism

JIS Fittings:

30-Degree Flare: JIS fittings utilize a 30-degree flare seating surface. The flare creates a seal by compressing the tubing against the fitting, which is effective in preventing leaks under high pressure.

Sealing Method: The seal is achieved through metal-to-metal contact between the flare and the fitting, ensuring a secure and leak-proof connection.

JIC Fittings:

37-Degree Flare: JIC fittings feature a 37-degree flare seating surface. This design provides a slightly wider angle than JIS fittings, which can enhance the sealing capability under higher pressure conditions.

Sealing Method: Similar to JIS fittings, JIC fittings also rely on metal-to-metal contact between the flare and the fitting to create a leak-proof seal. The 37-degree flare is particularly effective in handling higher pressures and more severe hydraulic conditions.

Pressure Ratings

JIS Fittings:

Typical Pressure Ratings: JIS fittings are designed to handle moderate to high pressure, with typical ratings varying based on the specific fitting and material. They are suitable for many industrial applications but may have limitations in extremely high-pressure environments.

Application Suitability: JIS fittings are well-suited for applications that require precise metric connections and reliable sealing under moderate to high pressure.

JIC Fittings:

Typical Pressure Ratings: JIC fittings are known for their high-pressure ratings, often exceeding those of JIS fittings. They are designed to perform under extreme pressure conditions, making them ideal for heavy-duty applications.

Application Suitability: Due to their higher pressure ratings, JIC fittings are preferred in industries where hydraulic systems are subjected to severe pressures and require robust connections.


Interchangeability Conditions: JIS fittings are not directly interchangeable with JIC fittings due to differences in thread type, pitch, and flare angle. Adapters or conversion fittings are required to connect JIS fittings to systems designed for JIC fittings.

Considerations: When attempting to interchange JIS and JIC fittings, it is crucial to use appropriate adapters to ensure a secure and leak-proof connection. Direct interchange without adapters can lead to leaks and system failure.

How to Choose the Suitable Thread Between JIC and JIS

Selecting the appropriate thread type between JIC (Joint Industry Council) and JIS (Japanese Industrial Standard) fittings is crucial for ensuring the efficiency and reliability of hydraulic systems. Here’s a detailed guide to help you make the right choice:

Precision Engineering JIS
JIC 74° Topa

Understand Your Application Requirements

Pressure and Temperature Conditions:

High-Pressure Applications: JIC fittings are designed to handle higher pressure ratings, making them suitable for demanding environments like aerospace, defense, and heavy machinery.

Moderate to High Pressure: JIS fittings can handle moderate to high pressure but may not be as robust as JIC in extremely high-pressure scenarios.

Fluid Compatibility:

Corrosive Fluids: Both JIC and JIS fittings are available in materials like stainless steel and brass, which are resistant to corrosion. Choose the material based on the specific fluid being used.

Environmental Conditions:

Harsh Environments: If the system will operate in harsh environments with exposure to elements like saltwater or chemicals, consider the material and design durability. JIC fittings, with their robust construction, might be more suitable.

Compatibility with Existing Systems

Thread Type:

Metric Systems: If your existing system uses metric components, JIS fittings with their metric threads are a natural choice.

Imperial Systems: For systems that use Unified National Fine (UNF) threads, JIC fittings will be more compatible.

Equipment Origin:

Japanese Machinery: Equipment and machinery manufactured in Japan or following Japanese standards will likely require JIS fittings.

North American Machinery: Machinery made in the US or following North American standards will typically use JIC fittings.


Adaptability: If you need to adapt JIS fittings to a JIC system or vice versa, ensure you have the correct adapters. This is crucial for maintaining system integrity and preventing leaks.

Assess Availability and Cost

Regional Availability:

Local Markets: Consider the availability of fittings in your region. JIC fittings are widely available in North America, while JIS fittings are more common in Asia.

Cost Implications:

Cost Efficiency: While both types of fittings are similar in price, the cost can vary based on material and regional availability. Consider the total cost, including any necessary adapters or conversion fittings.

Installation and Maintenance

Ease of Installation

Tool Compatibility: Ensure you have the appropriate tools for installing the chosen fitting type. JIC fittings typically require standard wrenches used in North American systems, while JIS fittings might need metric tools.

Maintenance Requirements:

Durability: JIC fittings are known for their durability in high-pressure environments, potentially reducing the frequency of maintenance.

Ease of Replacement: Choose a fitting type that is readily replaceable in your region to minimize downtime during maintenance.

Industry Standards and Compliance


Compliance: Ensure the fittings comply with relevant industry standards such as SAE J514 for JIC fittings and JIS B 8363 for JIS fittings.

Regulatory Requirements: Some industries have specific regulatory requirements for hydraulic systems. Verify that the chosen fitting type meets these regulations.

Decision-Making Checklist

Identify Pressure and Temperature Requirements: Determine if your system needs high-pressure capabilities (favoring JIC) or moderate to high pressure (favoring JIS).

Check System Compatibility: Match the thread type to your existing system’s standard (metric for JIS, imperial for JIC).

Evaluate Material and Environmental Needs: Choose the material that best suits your operating environment.

Consider Availability and Cost: Ensure fittings are easily available in your region and fit within your budget.

Plan for Installation and Maintenance: Select fittings that are easy to install and maintain with available tools and expertise.

Verify Standards Compliance: Ensure the fittings meet industry and regulatory standards.

Seek Expert Advice: Consult with professionals and follow manufacturer guidelines.

By carefully considering these factors, you can choose the most suitable thread type between JIC and JIS fittings, ensuring a reliable and efficient hydraulic system tailored to your specific needs.


If you found this guide helpful, please share it with your colleagues and networks to spread the knowledge. For more information or assistance in selecting the right fittings for your hydraulic system, feel free to reach out to our experts. Your feedback and questions are always welcome, and we are here to help you make the best choices for your specific needs.


JIS fittings use metric threads and a 30-degree flare, while JIC fittings use UNF threads and a 37-degree flare.

No, JIS and JIC fittings are not directly interchangeable due to differences in thread type and flare angle. Adapters are required for compatibility.

JIC fittings are generally better suited for high-pressure applications due to their robust design and higher pressure ratings.

JIS fittings are primarily available in regions with Japanese machinery, but they can be sourced globally, especially in markets with strong Japanese industrial presence.

Both JIS and JIC fittings are commonly made from stainless steel, brass, and carbon steel, chosen for their durability and resistance to corrosion.

Choose JIS fittings if your system uses metric components and Japanese machinery. Opt for JIC fittings if you need high-pressure capabilities and compatibility with North American standards.

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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.

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What is DIN Hydraulic Fitting?

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What is An ORB Hydraulic Fitting

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An vs JIC Hydraulic Fittings: What's the Difference

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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!

hydraulic adapters manufacturer Topa in China

Hydraulic Adapters Manufacturer

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, DIN standard adapters.

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

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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:

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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.

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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Interlock Hose Fittings

Interlock Hose Fittings Factory in China

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                     ※ High-pressure resistance

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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!

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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!

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

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

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

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Interloc hose ferrule, for use with interlock hose fittings.

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

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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.

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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
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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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Hydraulic Hose Fittings

JIS Hydraulic Hose Fittings

JIS hydraulic hose fittings have various sizes and types, including male and female hydraulic adapters, elbows, tees, and couplings, among others. They are designed to meet the JIS B2351 standard, which specifies the dimensions, materials, and performance requirements for hydraulic hose fittings.

Topa can provide large sizes and materials of JIS hydraulic hose fittings. Please contact us if you need more information on the JIC hydraulic hose crimp fittings.

JIS Hydraulic Hose Fittings Video

This video is about the details of Topa JIS hydraulic hose fitting.

JIS hydraulic hose fittings are designed for high-pressure hydraulic systems. They can be applied to various hydraulic fluids systems, including oil, water, and other fluid applications.

Please contact with us if you have any questions about hydraulic hose end fittings or other products.

Hydraulic Hose Fitting Catalog

Topa offers various types of hydraulic hose fittings, and this catalog includes all of them.

Please contact us If you need more information in selecting the right hydraulic hose fittings, or would like some free samples.

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Metric JIS Adapter

Metric JIS Adapter

Metric JIS adapters typically feature a 30-degree flare on the fitting end, which is used to create a seal with the corresponding flare on the end of the tubing or hose. Topa provides different sizes and types of JIS metric adapters.

Metric JIS Adapter Video

This video shows the details of hydraulic metric JIS adapter.

Metric JIS adapter can be used in a wide range of hydraulic applications, including industrial machinery, construction equipment, and automotive systems.

If you have any questions about metric pipe adapters or other products, please contact us.

Metric Fitting Catalog

Topa offers various types of metric fittings, and this catalog includes all of them.

Please contact us if you need more information on metric fittings or would like some free samples.

METRIC hydraulic fitting catalog Topa
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