Yuyao Ruihua Hardware Factory

Choose Your Country/Region

  Service Line: 


  Email:


You are here: Home » News and Events » Industry News » JIS and JIC Fittings

JIS and JIC Fittings

Views: 25     Author: Site Editor     Publish Time: 2024-01-15      Origin: Site


facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button

Welcome to our information about JIC and JIS hydraulic fittings! If you're into hydraulics, whether you're a pro or just starting out, you're in the right place. We're going to break down everything you need to know about these two fitting types. From how they're used to the benefits they offer and the differences between them – we've got it all covered. Did you know, for instance, that JIS and JIC fittings might look similar at first glance, but they're actually quite different and can't be swapped out for each other? Let's jump in and find out more about these differences in standards, sealing abilities, and how they're used.

Understanding JIS Fitting Standards


Origin and Development of JIS Standards

The Japanese Industrial Standard (JIS) was established post-World War II to streamline manufacturing and industrial processes in Japan. It was a move to fuel their growth in the international markets. JIS standards for hydraulic fittings were developed to ensure efficiency and safety in hydraulic systems, particularly for Japanese and Korean heavy equipment manufacturers like Komatsu, Kobelco, Hitachi, and Kubota.


Key Features of JIS Fittings

JIS hydraulic fittings are known for their high-quality services and precision engineering. One key feature is their 30-degree flare angle, which differs from the 37-degree angle used in American JIC fittings. This small but critical difference in flare angle means that JIS and JIC fittings are not interchangeable, emphasizing the importance of understanding industrial and regional standards.

Types of Japanese Hydraulic Fittings

JIS B 0202: Features and Applications

This specification covers tapered threads used on JIS fittings. It is commonly employed in applications where fluid power and fuel delivery are critical, ensuring a secure connection.


JIS Metric 60 Cone Seal: Characteristics

It features a metric thread and a 60-degree cone which provides a reliable seal for high-pressure environments. This type is favored in hydraulic systems within Asian countries.


JIS B 0203: Usage and Specifications

This standard details parallel threads for JIS fittings. It's widely used for tubing and hoses connection systems in heavy equipment.


Komatsu Style 30° Flare Parallel Threads

Specifically designed for Komatsu equipment, these fittings use a 30-degree seat for sealing, ensuring reliable performance in demanding conditions.


Komatsu Flange Fitting: A Detailed Analysis

These are flange-type fittings providing strong connections in high-vibration systems. They are crucial for high-pressure applications and are a staple in the product lines of many wholesale distributors and brand manufacturers.


Common Applications and Industries Using JIS

JIS hydraulic fittings are prevalent in industries where Japanese and Korean heavy equipment is used. This includes construction, mining, and agriculture. North America also has a significant market share for JIS fittings due to the presence of Japanese equipment manufacturers like Caterpillar and John Deere.


Advantages of JIS Fittings in Specific Scenarios

In scenarios where equipment manufacturers specify JIS standards, using these fittings is non-negotiable for maintaining equipment integrity and safety. Additionally, in markets dominated by Japanese connections, JIS fittings offer unmatched compatibility and reducing production costs while growing market share. They are essential in maintaining the efficiency and safety of hydraulic systems.

JIS fittings are tailored for specific sealing requirements and pressure ratings. For instance, when dealing with Japanese hydraulic systems, the JIS hydraulic fittings are the go-to choice over American thread types or British connections due to their design compatibility and sealing efficiency.


Exploring JIC Fitting Standards


Background of JIC Standards: SAE J514 and MIL-DTL-18866


JIC fittings, or Joint Industry Council fittings, trace their standards back to the SAE J514 and MIL-DTL-18866. These standards were developed to ensure consistency and reliability in hydraulic systems. The SAE J514 standard is widely recognized in the North American market and has been adopted internationally for hydraulic fittings. It specifies the requirements for a 37-degree flare seating surface. MIL-DTL-18866, on the other hand, provides the specifications for the performance of fittings suitable for use in high-pressure applications.

Distinctive Characteristics of JIC Fittings


JIC fittings are known for their 37-degree flare angle, which is a key characteristic differentiating them from other fittings such as British Standard or Japanese Industrial Standard (JIS) fittings, which often have a 30-degree seat. This flare angle allows for a metal-to-metal seal, which is essential for high-pressure applications. The flare angle ensures that when the fitting is tightened, it creates a seal that can withstand the pressure without leaking.

JIC Fittings in North American Markets


In North America, JIC fittings hold a significant market share due to their compatibility with a wide range of American thread types. They are commonly found in hydraulic systems of heavy equipment brands like Caterpillar and John Deere. JIC fittings have become the standard in many industrial and regional standards, making them the go-to choice for equipment manufacturers and wholesale distributors.

Benefits of JIC Fittings in High-Pressure Applications


The design of JIC fittings offers numerous benefits in high-pressure environments. Their robust construction, often made of stainless steel, allows for reliable performance under stress. The metal-to-metal seal minimizes the risk of leaks, which is crucial for maintaining efficiency and safety in hydraulic systems. Furthermore, JIC fittings are interchangeable, simplifying the tubing and hoses connection system and reducing production costs for manufacturers. The ability to withstand high pressure without compromising on safety or performance fuels their growth in international markets.


JIC fittings, with their 37-degree flare seating surface and adherence to strict standards like SAE J514 and MIL-DTL-18866, are pivotal in high-pressure hydraulic systems. Their distinctive characteristics and benefits ensure they are a staple in the North American market and beyond, supporting industries that require reliable and efficient fluid power applications.


Comparative Analysis of JIS Vs JIC Fittings

Standards Difference: A Technical Perspective


When we delve into the standards difference, we're looking at the Japanese Industrial Standard (JIS) versus the Joint Industry Council (JIC) standards. Both set guidelines for hydraulic fittings, but they stem from different origins. JIS hydraulic fittings adhere to Japanese industrial specifications, while JIC fittings follow North American standards, including SAE J514 and MIL-DTL-18866.

Dimensional Differences


Thread types and sizes

JIS fittings often use British Standard (BSPP) thread or metric thread types, while JIC fittings typically employ UN thread. This means that JIS and JIC have distinct thread patterns and pitches, which affect how they connect with tubing.


Sealing surfaces and methods

Sealing requirements differ between the two. JIS fittings may feature a 30-degree flare tube connector or other sealing methods, whereas JIC fittings standardize on a 37-degree flare seating surface. This flare angle is crucial for ensuring a tight seal.


Fitting angles and shapes

The shape of JIS couplings can vary, with some designed for Japanese connections, while JIC adapter fittings maintain a consistent design suitable for North American and international markets. The fitting angles are specific to each standard and must match the corresponding tubing for proper installation.

Performance and Reliability


Pressure ratings and tolerances

JIS hydraulic fittings are designed for high-pressure environments, just like JIC. However, the pressure ratings and tolerances may differ due to the standards they follow. Each type of fitting is engineered to meet the demands of heavy equipment and hydraulic systems.

Material specifications

Both JIS and JIC fittings are often made from durable materials like stainless steel. These materials are chosen for their strength and heat insulation properties, ensuring reliable performance.

Quality and certification standards

Quality and certification standards are paramount for both types of fittings. Equipment manufacturers often require certification to guarantee efficiency and safety of hydraulic systems. JIS and JIC fittings must meet their respective industrial and regional standards to be considered for use.

Interchangeability and Compatibility


Non-interchangeability is a significant concern. Using the wrong fitting can lead to leaks, equipment damage, and safety hazards. It's essential to match the fitting type to the corresponding standard to avoid these issues.

Guidelines for proper fitting selection To ensure proper fitting selection, always check the thread type, sealing method, and pressure requirements. When in doubt, consult with wholesale distributors or brand manufacturers who can provide high quality services and guidance.

Availability and Global Usage


Regional preferences for JIS or JIC

JIS fittings are prevalent in Asian countries, particularly with Japanese and Korean heavy equipment brands like Komatsu, Kobelco, Hitachi, and Kubota. Conversely, JIC fittings dominate the North American market, with manufacturers such as Caterpillar and John Deere relying on them.

Influence of industry standards on availability

Industry standards heavily influence the availability of fittings. JIS and JIC fittings are readily available from suppliers who cater to their respective markets and standards.

Impact of globalization on fitting selection

Globalization has made it easier to source both JIS and JIC fittings. However, it's crucial to understand the standards difference, usage difference, and sealing difference to make an informed choice. Fittings are not just about connecting tubing and hoses; they play a vital role in the efficiency and safety of hydraulic systems.

By focusing on these details, we can ensure that the right fittings are used for the right applications, fueling the growth of businesses and maintaining high standards of safety and efficiency in hydraulic systems.


Identifying and Choosing the Correct Fittings

Guide to Identifying JIS vs JIC Fittings


When working with hydraulic systems, it's crucial to distinguish between JIS (Japanese Industrial Standard) and JIC (Joint Industry Council) fittings. Both have unique characteristics that cater to different sealing requirements and industrial standards.

JIS fittings, often used in Japanese hydraulic applications, feature a 30-degree flare angle. They are common in equipment from manufacturers like Komatsu, Kobelco, Hitachi, and Kubota. In contrast, JIC fittings, prevalent in North American markets, use a 37-degree flare seating surface. They meet the specifications of standards such as SAE J514 and MIL-DTL-18866.

To identify them, look for the flare angle on the tube connector fittings. A JIS fitting will have a smaller angle compared to a JIC fitting. Additionally, check the threads. JIS fittings often follow metric or British Standard, while JIC fittings usually have UN thread types.

Best Practices for Selecting the Right Fittings


Selecting the right fittings is not just about efficiency and safety; it's also about ensuring reliable performance in high-pressure environments. Here's how to choose correctly:

1. Match the Standards: Ensure the fitting type corresponds with the equipment manufacturers' specifications.

2. Consider the Application: High-pressure applications may require stainless steel hydraulic fittings for durability.

3. Verify the Sealing Surface: A mismatch in sealing difference can lead to leaks. Confirm the flare angle and seating surface.

4. Check Compatibility: Non-interchangeability is a common issue. Verify that the fittings are designed to work together.


Common Mistakes to Avoid in Fitting Selection


Mistakes in fitting selection can lead to downtime and costly repairs. Here are some pitfalls to steer clear of:

lIgnoring Standards: Overlooking the difference between JIS vs JIC fitting standards can result in incompatible connections.

lMixing Connections: Using a JIS coupling with a JIC adapter fitting is a recipe for failure. Stick to one standard.

lNeglecting Pressure Ratings: Not all fittings are suitable for all pressure levels. Check the ratings to avoid breaches.


By focusing on these aspects, you can ensure that the tubing and hoses connection system in your hydraulic equipment is secure and functional, whether you're dealing with Japanese and Korean heavy equipment or machinery in the North American market. Remember, in the realm of hydraulic fittings, precision is key to maintaining high quality services and reducing production costs, ultimately helping to fuel their growth in the competitive industrial landscape.


Maintenance and Troubleshooting

Routine Maintenance Tips


Regular maintenance is crucial for the longevity and efficiency of your hydraulic systems, particularly when it comes to JIS and JIC fittings. Here's what you can do to keep things running smoothly:

1. Inspect Regularly: Check for signs of wear, such as cracks or corrosion on stainless steel hydraulic fittings.

2. Cleanliness is Key: Ensure the fittings and surrounding areas are free from contaminants to maintain sealing requirements.

3. Tighten Correctly: Over-tightening can cause damage. Follow the torque specifications provided by equipment manufacturers.

4. Lubricate Threads: Use appropriate lubricants on threads of British connections and others to prevent galling.

5. Replace O-Rings: Worn O-rings can lead to leaks. Replace them as part of routine maintenance for tube connector fittings.

Identifying and Resolving Common Issues


Encountering problems with JIS hydraulic fittings or JIC fittings? Here's how to tackle some common issues:

lLeaks: Look for the source. It might be a simple fix like tightening a connection or replacing a damaged O-ring.

lPressure Drops: This could indicate a blockage or a faulty fitting. Check for obstructions or damage to tubing.

lNon-interchangeability: Mixing up JIS and JIC can lead to improper fits. Ensure you're using the correct industrial and regional standards.


When to Replace or Upgrade

Knowing when to replace or upgrade your hydraulic fittings can save you from unexpected downtime:

lVisible Wear: If there's noticeable damage to JIS couplings or JIC fittings, it's time for a replacement.

lPressure Mismanagement: In case your system can't maintain the right pressure, consider upgrading to fittings that meet the Japanese industrial specifications.

lMarket Evolution: With changes in market share and technology, upgrading to newer standards like JIS B8363 or SAE J514 could enhance efficiency and safety.

JIS fittings and JIC fittings have different standards difference, sealing difference, and usage difference. It's critical to understand these to ensure reliable performance in your hydraulic systems.


FAQs on JIS and JIC Fitting Standards

What are the main differences between JIS and JIC fittings?

JIS (Japanese Industrial Standard) and JIC (Joint Industry Council) fittings are both critical in the world of hydraulic fittings, but they have distinct characteristics. The primary standards difference lies in their sealing requirements and flare angles. JIS fittings typically have a 30-degree flare angle, while JIC fittings use a 37-degree flare seating surface. Additionally, JIS often adheres to metric dimensions, whereas JIC fittings usually follow American thread types.

Can JIS and JIC fittings be used interchangeably?

Due to the non-interchangeability of their designs, JIS and JIC fittings cannot be used interchangeably. The flare angle difference and thread types mean that attempting to use one in place of the other could lead to leaks or damage to the hydraulic system. It's crucial for equipment manufacturers and maintenance personnel to use the correct tube connector fittings to ensure reliable performance.

How do JIS and JIC standards impact hydraulic system performance?

The efficiency and safety of hydraulic systems often hinge on the proper selection and installation of fittings. JIS and JIC standards provide guidelines that ensure fittings can withstand high-pressure environments. By following these standards, systems achieve optimal sealing and minimize the risk of leaks, which is vital for maintaining high quality services and reducing production costs.

What industries predominantly use JIS fittings?

JIS fittings are commonly found in Japanese and Korean heavy equipment, such as brands like Komatsu, Kobelco, Hitachi, and Kubota. They are also prevalent in Asian countries where Japanese industrial specifications are standard. However, their market share is growing in the North American market as companies like Caterpillar and John Deere integrate more JIS hydraulic fittings into their machinery.

Are there any safety considerations when using JIC fittings?

When dealing with JIC fittings, it's essential to consider the high-pressure applications they are often involved in. Proper installation and regular maintenance are crucial to avoid potential hazards. Stainless steel hydraulic fittings are preferred for their durability and resistance to corrosion. Moreover, ensuring the correct tubing and fitting match will prevent issues that could compromise the efficiency and safety of the hydraulic system.



In this comprehensive look into the world of hydraulic fittings, we've unraveled the complexities of JIS (Japanese Industrial Standard) and JIC (Joint Industry Council) fittings. Starting with the origins and key features of JIS fittings, we explored a range of types like JIS B 0202 and Komatsu Flange Fittings, understanding their specific applications and advantages in various scenarios.


Shifting to JIC fittings, we delved into their background, distinctive characteristics, and their significant role in North American markets, especially in high-pressure applications. The comparative analysis between JIS and JIC was particularly enlightening, revealing the technical differences, performance aspects, and their interchangeability challenges.


Understanding the correct usage and selection of these fittings is crucial. We've provided guidelines for identifying the right fittings, along with best practices and common mistakes to avoid. Maintenance and troubleshooting were also covered, ensuring longevity and efficiency in hydraulic systems.


In conclusion, whether you're an industry professional or just curious, this guide offers essential insights into the world of JIS and JIC fittings, emphasizing their impact on hydraulic system performance and the importance of correct fitting selection for safety and efficiency.

Hot Keywords: Hydraulic Fittings Hydraulic Hose Fittings, Hose and Fittings,   Hydraulic Quick Couplings, China, manufacturer, supplier, factory, company
Send Inquiry

Product Category

Contact Us

 Tel: +86-574-62268512
 Fax: +86-574-62278081
 Phone: +86-13736048924
 Email: ruihua@rhhardware.com
 Add: 42 Xunqiao, Lucheng, Industrial Zone, Yuyao, Zhejiang, China​

Make Business Easier

​Product quality is RUIHUA’s life. We offer not only products, but also our after-sales service.

View More >

News and Events

Leave a Message
​Copyright © Yuyao Ruihua Hardware Factory.  Supported by Leadong.com  浙ICP备18020482号-2
Choose Your Country/Region