Hydraulic JIS Fittings Manufacturer in China

❖ 30° and 60° tapered connections

❖ BSPP and BSPT ports available

❖ Made of brass, carbon and stainless steel

❖ Tight connection. No O-ring required

Product List

JIS hydraulic fitting dimensions define these fittings’ size and wall thickness according to Japanese standards. We offer various types of JIS fittings with tapered and parallel threads. JIS fittings are commonly used as hose fittings on Japanese and Korean equipment, such as Komatsu, Hitachi, Kubota, and Kagome. Topa JIS adapters have 30° flare and 60° tapered fitting with BSP and BSPT two types of hose ends. JIS hydraulic fitting ranges in sizing from 1/8″ t and is available in steel, brass, or, stainless steel, Steel hydraulifittingsng have higher fatigue and impact resistance. JIS fittings can be reused multiple times.

Products Video

This video provides an in-depth look at the complete manufacturing and testing process of our JIS hydraulic fittings. From raw material selection to final inspection, we demonstrate our commitment to precision, quality, and excellence in every step.

You’ll see advanced CNC machining in action, ensuring exact thread cutting and flawless surface finishing. The video also highlights our rigorous quality control procedures, including pressure and leakage tests, to guarantee that each fitting meets industry standards.

Watch the video to discover how Topa delivers reliable, high-performance hydraulic fittings tailored for your needs. Let us show you why our products are trusted across various industries worldwide!

Application

JIS hydraulic fittings are available in BSPP and BSPT designs with both 30 and 60 degree hose ends. JIS hydraulic fittings are used for hydraulic fluid handling connections. They are commonly used as hose couplings on equipment designed and/or manufactured in Japan and Korea.

Custom JIS Fittings for OEM & Supply Programs

Send us your drawings, samples, technical specifications, estimated quantities, and application requirements. Topa supports custom JIS fittings for OEM projects, distributor product ranges, private-label programs, and recurring industrial purchasing.

Product Structure and Principles

JIS hydraulic fittings are available in a wide variety of sizes and configurations, including 30° flare fittings, BSPP thread fittings, and Komatsu-style adapters. These fittings cater to various industries like construction, agriculture, and industrial equipment, ensuring durability and leak-proof performance under high-pressure conditions.

Features

JIS hydraulic fittings are characterized by their clean, robust design and precise machining. They feature a 30-degree flare angle, which is unique to JIS standards, ensuring a reliable connection. The fittings often come with a smooth, corrosion-resistant finish, achieved through zinc plating or stainless steel polishing, making them durable and visually appealing. Depending on the type, JIS fittings include male or female threads, BSPP or metric threads, and sealing surfaces designed for leak-proof performance.

Working Principles

The key to JIS hydraulic fittings’ effectiveness lies in their 30-degree flare angle and metal-to-metal sealing mechanism. During assembly, the flare cone of the fitting mates securely with the corresponding hose or tube, creating a tight, leak-free connection. This design distributes pressure evenly across the connection point, minimizing the risk of leaks even under high-pressure conditions. In some cases, additional O-rings are used for enhanced sealing in applications requiring extra reliability.

JIS Fittings Types

JIS hydraulic fittings come in a diverse range of types, each tailored to meet the unique demands of various hydraulic systems. Whether used in construction, agriculture, or industrial applications, JIS fittings provide versatility and precision to support high-pressure operations and complex hydraulic requirements.

JIS 60° Cone Seat Fittings(BSPP）

Designed with BSPP threads and a 60-degree cone seat, these fittings ensure reliable fluid transfer. They are widely used in Japanese and Korean machinery for their adaptability and ease of installation.

JIS Tapered Thread (BSPT) Fittings

With tapered threads, these fittings provide secure, thread-to-thread sealing without additional components. Ideal for high-pressure systems, they conform to JIS B 0203 standards for performance.

Komatsu Style 30° Flare Fittings

Tailored for Komatsu equipment, these fittings feature a 30-degree internal cone and metric threads for precise compatibility. They are essential in heavy machinery like excavators and loaders.

JIS Flange Fittings

JIS Flange Fittings, adhering to JIS B 8363 standards, deliver robust connections for large-diameter hoses. They are perfect for industrial and construction systems requiring high-pressure durability.

Request a Free Consultation

Unsure which fittings are best for your system? Schedule a consultation with our expert team for personalized recommendations.

JIS vs Other Threads

When choosing hydraulic fittings, it’s essential to understand the differences between JIS threads and other popular thread types like BSP, JIC, and NPT. Each thread standard has its own design, thread angles, sealing mechanisms, and compatibility requirements, which can significantly impact the performance and reliability of your hydraulic systems. Whether you’re working with Japanese machinery, European equipment, or North American systems, understanding these differences helps ensure the correct fittings are selected, minimizing the risk of leaks, pressure failures, and maintenance issues.

JIS vs JIC Threads

JIS (Japanese Industrial Standard) and JIC (Joint Industrial Council) threads are designed to meet the specific needs of different hydraulic systems, with distinct thread angles and sealing mechanisms. JIS fittings use a 30-degree flare angle for a secure metal-to-metal seal, making them ideal for moderate pressure applications, particularly in Japanese and Asian machinery. They typically feature metric threads or BSPP threads, which are widely used in Japan and surrounding regions. On the other hand, JIC fittings utilize a 37-degree flare angle, providing a more aggressive seal suitable for high-pressure systems. JIC fittings are commonly paired with UNF (Unified National Fine) threads, which are standard in North American hydraulic systems.

The sealing mechanism also differs: JIS fittings achieve their seal through metal-to-metal contact, ensuring leak-proof performance in medium-pressure systems, while JIC fittings rely on a more aggressive flare design, making them better suited for high-pressure applications. These differences in thread angles, types, and sealing methods mean that JIS and JIC fittings are not interchangeable, and selecting the appropriate type for a given system is critical for maintaining reliability and performance.

JIS vs BSP Threads

JIS (Japanese Industrial Standard) threads are commonly found in hydraulic systems in Japan and other parts of Asia. They typically feature metric threads and a 30-degree flare angle. JIS fittings are designed for moderate-pressure applications, providing reliable metal-to-metal sealing. They are often used in industries such as construction, agriculture, and manufacturing, where standardization with Japanese machinery is crucial.

BSP (British Standard Pipe) threads, on the other hand, are widely used in Europe and other parts of the world. BSP fittings can either have parallel threads (BSPP) or tapered threads (BSPT). BSPP fittings provide a seal using a flat surface and an O-ring or washer, while BSPT fittings use a tapered thread design for a tighter seal. BSP threads are commonly found in British and European hydraulic systems and are ideal for high-pressure fluid transfer.

Avoid Common Pitfalls

Hydraulic NPT fittings are renowned for their exceptional sealing capabilities and versatility, making them a cornerstone in fluid and gas systems. Designed with a tapered thread structure, they ensure a reliable, leak-free connection that withstands high pressures, extreme temperatures, and demanding environments.

Pressure Compatibility

Hydraulic fittings' pressure ratings are closely linked to the pressure ratings of the hoses they are paired with. As long as the hose is suitable, the fitting will also perform without issues. Most of our fittings are designed to withstand pressures ranging from 300 bar to 1000 bar. We've conducted extensive pressure testing, but it's important to note that these tests are only applicable to the specific fitting types tested.

Compatibility with Other Brands

Our hydraulic fittings are designed to meet Parker and Eaton standards, ensuring compatibility with widely used market brands. If you are already using fittings from other brands in your hydraulic system, we can provide you with precise model cross-references to ensure seamless integration with your existing setup.

System Connectivity

Our fittings are compatible with most hydraulic systems, including standard thread types like BSP, NPT, JIC, and sealing methods such as O-rings and cone seals. These conform to globally accepted specifications. If you need custom fittings for specialized equipment or non-standard pipelines, we can offer tailored solutions to ensure perfect compatibility.

Stainless Steel Selection

304 Stainless Steel: The most commonly used stainless steel, ideal for general environments and offering excellent corrosion resistance. It’s widely used in hydraulic systems where the environment doesn’t expose the fittings to extreme corrosive conditions. For more demanding applications, 316 Stainless Steel may be used for even better resistance against harsh environments like marine or chemical systems.

Planning a JIS Fitting Purchase?

Send us your product numbers, thread specifications, sizes, quantities, material requirements, packaging requirements, and destination. For multi-SKU requirements, Excel or PDF purchasing lists are recommended. Our team can organize the models and prepare a consolidated quotation.

Choose Topa

More Than Just a Hydraulic Fittings Manufacturer

At Topa, we are committed to providing top-quality hydraulic solutions tailored to meet the diverse needs of our clients. With a focus on precision, reliability, and customer satisfaction, we offer a range of services designed to support every stage of your project—from custom fittings and rapid prototyping to expert consultation and after-sales support. Let Topa be your trusted partner in hydraulic solutions, delivering excellence at every turn.

Custom Fitting Solutions

Tailored hydraulic fittings to meet specific requirements for various industries.

Quality Assurance Testing

Rigorous inspection and pressure testing to ensure all fittings meet high standards.

Multi-SKU Supply

Combine different JIS fitting sizes, thread types, configurations, and series in one purchasing program.

Flexible Proudtcs Options

Customizable designs for fittings, hoses, and couplings to suit any specific requirement.

Expert Consultation

Our team of experts provides advice on the best hydraulic solutions for your needs.

Global Shipping

Reliable and efficient shipping options for fast delivery worldwide.

OEM & Private Label

Support for product labels, SKU identification for qualified purchasing programs.

After-Sales Support

Dedicated after-sales support to resolve any issues and ensure long-term satisfaction.

Compatible JIS Hydraulic Fitting Manufacturer in China

Unlike JIC fittings, which typically use a 37° flare, many JIS hydraulic fittings use a 30° flare or cone sealing surface. The connection is sealed by precise metal-to-metal contact between the mating surfaces, making correct thread and seat identification essential.

Key advantages of JIS hydraulic fittings include:

Reliable sealing for hydraulic fluid connections
Compact design for installation in limited spaces
Good resistance to vibration in mobile and industrial equipment
Available in corrosion-resistant materials and surface finishes
Suitable for a wide range of Japanese and Asian hydraulic systems
Multiple sizes, thread types, and configurations available for replacement and distributor supply

FAQ

What is JIS Hydraulic Fittings?

JIS fittings are commonly used as hose fittings on equipment designed and/or manufactured in Japan and Korea.

What is the difference between JIS and JIC hydraulic fitting?

The standards are different, JIS hydraulic fitting uses the Japanese Industrial Standard and JIC hydraulic fitting uses the Joint Industry Council Standard. Sealing is different, JIS hydraulic fitting uses a Komatsu type fitting installation, while JIC hydraulic fitting uses a 37-degree cone installation.

What does JIS stand for in fittings?

JIS stands for Japanese Industrial Standards. It is the most important and authoritative national standard in Japan and is now widely used in the hydraulic industry worldwide.

How is the JIS hydraulic fitting connected?

JIS hydraulic fitting is mostly used for heavy equipment hose connection, using 30 degrees flare or 60 degrees cone for metal to metal link, also can use o-ring for sealing on this basis.

Can you produce custom JIS fittings from drawings or samples?

Yes. For OEM, distributor, and volume purchasing projects, we can review drawings, samples, dimensions, materials, thread specifications, and surface finish requirements for custom production.

Can you identify a JIS fitting from a part number or photo?

Yes. You can send us the current part number, fitting photo, drawing, thread details, or dimensions. Our team can help identify possible corresponding JIS fitting options for technical verification.

Can BSP hydraulic adapters and JIS hydraulic fitting be used interchangeably?

No, because JIS hydraulic fitting and BSP hydraulic adapters have got different application standards, varying cone diameters, and lengths of threads.

What information should I send for JIS fitting identification?

Please provide the part number, thread type and size, hose size, fitting angle, sealing surface, dimensions, material, and photos or drawings if available.

Can I combine different JIS fitting sizes and types in one order?

Yes. Distributors and wholesalers can combine different JIS fitting sizes, thread types, angles, and configurations in one purchasing list. This makes it easier to source multiple SKUs through one supplier.

Can you supply JIS fittings for Japanese equipment replacement programs?

Yes. JIS fittings are commonly used on Japanese and Asian hydraulic equipment. Send us the equipment reference, existing part number, photos, drawings, or fitting dimensions so we can help check suitable replacement options.

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Send Your JIS Fitting Requirements

Send us your JIS fitting part numbers, specifications, purchasing list, estimated quantities, and destination. Topa can help organize multiple models, check technical details, and prepare quotations for distributor inventory, equipment replacement programs, OEM requirements, and regular replenishment.

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Hydraulic JIS Fittings Manufacturer in China

❖ 30° and 60° tapered connections

❖ BSPP and BSPT ports available

❖ Made of brass, carbon and stainless steel

❖ Tight connection. No O-ring required

Product List

18611 JIS Hose Fitting

28611- JIS Hose Fitting

28641- JIS Hose Fitting

28691- JIS Hose Fitting

19611 JIS GAS Hose Fitting

29641- JIS GAS Hose Fitting

29691- JIS GAS Hose Fitting

29611- JIS GAS Hose Fitting

Metric to JIS Plug

88111 Komatsu Straight JIS Flange

88141 Komatsu 45° JIS Flange

88191 Komatsu 90° JIS Flange

1S Male JIS 30° Cone Adapter

1ST-SP JIS to BSPT Adapter

1ST4-SP 45° JIS to BSPT Adapter

1ST9-SP 90° JIS to BSPT Adapter

Metric to JIS Fitting

Male JIS x JIS Hydraulic Fitting BSPP Threads 30°Cone

JIS Male x JIS Male Hydraulic Fitting Metric Threads 30°Cone

BSPP JIC Male 37° Cone x JIS Male 30° Cone

JIC Male 37°Cone x JIS Female Extended 60°

JIS Female Cap-BSPP Threads Blanking Cap

JIS Female Cap-Metric Threads Blanking Cap

JIS Hydraulic Plug BSP Thread 30° Cone