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JIS Hydraulic Fittings Factory

OPK has the largest hydraulic hose range in the market, which is available with the most abrasion-resistant covers. As marketing-leading hydraulic hose manufacturers, we offer a range that can deliver high performance and can withstand the harshest working environments. Our hoses are designed to perform in both high and low temperatures and pressures and are suitable for a variety of applications. Each of our hydraulic hoses is also in compliance with stringent industry standards such as REACH and RoHS.

  • 29611 JIS Gas Female 60° Cone Seat

    29611 JIS Gas Female 60° Cone Seat

    Product Description Product name: JIS Gas Female 60° Cone Seat Pipe Fitting (29611) 1. Raw Material: Carbon Steel & Stainless Steel avail...

  • 18611 JIS Metric Male 60° Cone Seat

    18611 JIS Metric Male 60° Cone Seat

    1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...

  • 28611 JIS Metric Female 60° Cone Seat

    28611 JIS Metric Female 60° Cone Seat

    1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...

  • 19611 JIS BSPP Male 60° Cone Seat

    19611 JIS BSPP Male 60° Cone Seat

    1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...

About OPK Fitting

OPK FITTING Hydraulic Equipment Factory is China JIS Fittings Company and JIS Hydraulic Fittings Factory. We are a professional domestic factory with extensive experience in the production of hydraulic pipes and fittings. Our managing scope relates to various fields such as hydraulic systems etc.; Including all kinds of materials with different pressure levels, flexible hydraulic hoses with various size criteria, hose fitting, adaptor, etc. They have been respectively applied in the hydraulic and fluid conveyance systems of industries, such as machinery, metallurgy petroleum, construction, ships, space-flight, agriculture, pharmaceutical, food, and so forth.
We provide ODM/OEM customization services for a wide range of high-pressure hydraulic fittings and hydraulic oil pipe fittings.
Over 10 years of experience.
A team of skilled design professionals and talent.
Excellent product quality and thoughtful customer service.

Our 10 years of customisation experience has created the OPK Fitting brand value.

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JIS Fitting

1、What Are JIS Fittings ?

JIS Fittings refer to pipe and hydraulic connection components manufactured according to Japanese Industrial Standards (JIS). These fittings are widely used in Asia and international markets due to their precision engineering, high sealing performance, and compatibility with metric systems .

Commonly found in hydraulic systems, JIS fittings are designed to handle high-pressure fluid transfer. According to market data, over 50% of hydraulic equipment exported from Japan and surrounding regions adopts JIS standards , highlighting their importance in global supply chains.

2、Main Types Of JIS Fittings

（1）JIS 30° Flare Fittings

These fittings use a 30-degree flare seating surface to create a tight seal. They are widely used in medium-pressure hydraulic systems and offer reliable performance.

（2）JIS 60° Cone Fittings

JIS 60° cone fittings provide a strong metal-to-metal seal, making them suitable for high-pressure applications. They are commonly used in construction machinery and industrial equipment.

（3）JIS Metric Thread Fittings

These fittings follow metric thread standards and are compatible with modern hydraulic systems. Their standardized dimensions ensure easy integration.

  • Thread sizes range from M10 to M52
  • Pressure ratings can reach 700 bar (≈10,000 PSI)
  • Available in carbon steel, stainless steel, and brass

3、Applications Of JIS Fittings

（1）Construction Machinery

JIS fittings are widely used in excavators, cranes, and loaders. These machines require components that can withstand vibration and high pressure, often exceeding 400 bar .

（2）Automotive And Manufacturing

In automotive production lines, JIS fittings ensure stable hydraulic performance. Their precision helps reduce leakage rates by up to 30% compared to non-standard fittings .

（3）Marine And Shipbuilding

Due to their corrosion resistance, JIS fittings are commonly used in marine environments where durability is critical.

4、JIS Fittings Technical Comparison

Type Sealing Angle Pressure Capacity Application
30° Flare 30° Medium General Hydraulic
60° Cone 60° High Heavy Machinery
Metric Thread Flat/Seal High Modern Systems
Technical Comparison of Different JIS Fitting Types and Their Applications

5、About OPK Fitting

OPK FITTING Hydraulic Equipment Factory is a specialized domestic factory with hydraulic pipes and adaptors production experience. Our managing scope relates to various fields such as hydraulic systems etc.; Including all kinds of materials with different pressure levels, flexible hydraulic hoses with various size criteria, hose fitting, adaptor, etc.

They have been respectively applied in the hydraulic and fluid conveyance systems of industries, such as machinery, metallurgy petroleum, construction, ships, space-flight, agriculture, pharmaceutical, food, and so forth.

  • Over 10 years of experience.
  • A team of skilled design professionals and talent.
  • Excellent product quality and thoughtful customer service.

6、FAQs About JIS Fittings

Q1: What does JIS stand for?

JIS stands for Japanese Industrial Standards, which define specifications for industrial products used in Japan and globally.

Q2: Are JIS fittings interchangeable with BSP or NPT?

No, due to differences in thread type and sealing angles, adapters are required for compatibility.

Q3: What industries use JIS fittings the most?

Construction, automotive, marine, and manufacturing industries widely use JIS fittings.

Q4: How to ensure proper installation?

Always match thread type, apply correct torque, and use proper sealing methods to prevent leaks.