Hydraulic systems are critical in various industries, and selecting the right fittings is paramount for their proper function and safety. Two common standards for hydraulic fittings are JIS (Japanese Industrial Standard) and JIC (Joint Industry Council). While both serve the purpose of connecting components in hydraulic systems, they have distinct characteristics and are not always interchangeable.
This blog post will delve into the key differences between JIS and JIC fittings, helping you understand their unique features and make informed decisions when selecting the appropriate fittings for your hydraulic applications.
We’ll explore crucial aspects such as thread types, flare angles, and their typical applications. By understanding these differences, you can ensure compatibility within your hydraulic system and prevent potential issues like leaks, poor performance, and safety hazards.
What Are JIS Hydraulic Fittings

JIS (Japanese Industrial Standard) hydraulic fittings are essential components in hydraulic systems, facilitating the connection of various components like pipes, hoses, and valves. Manufactured according to the stringent quality standards set by the Japanese Industrial Standards, these fittings ensure reliable and leak-free connections in a wide range of applications. JIS fittings are recognized for their high quality, precision manufacturing, and adherence to strict quality control measures.
Available in a variety of sizes and materials, including steel, stainless steel, and brass, JIS fittings offer versatility and adaptability for diverse hydraulic system requirements. They are widely used in industries with significant Japanese manufacturing presence, ensuring compatibility and ease of maintenance within these specific applications.
What Are JIC Hydraulic Fittings

JIC (Joint Industry Council) fittings are a type of hydraulic fitting commonly used in North America and other parts of the world. They are characterized by their 37-degree flare angle, which creates a strong and reliable seal between the fitting and the hydraulic hose or tubing. This flare angle, combined with parallel threads, allows for a secure connection that can withstand high pressures and minimize the risk of leaks. JIC fittings are typically manufactured from materials such as steel, stainless steel, and brass, offering durability and compatibility with various hydraulic fluids.
Due to their reliability and versatility, JIC fittings are widely used in a variety of applications, including industrial machinery, construction equipment, agricultural machinery, and mobile hydraulic systems. They are an essential component in many fluid power systems, ensuring efficient and reliable fluid transfer.
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JIS vs JIC Fittings

What are the differences between JIS hydraulic fittings and JIC?
JIS (Japanese Industrial Standard) and JIC (Joint Industry Council) are two distinct standards for hydraulic fittings, each with its own set of specifications. Understanding their key standard differences is crucial for selecting the appropriate fittings for your hydraulic system and ensuring proper function and safety.
1. Flare Angle:
- JIS: Typically feature a 30-degree flare angle. This angle, while effective, may not be as robust as the JIC standard for withstanding extreme pressures.
- JIC: Characterized by a 37-degree flare angle. This steeper angle creates a stronger seal, making JIC fittings better suited for high-pressure applications. The 37-degree flare also provides a more secure connection, minimizing the risk of leaks even under demanding conditions.
2. Thread Type:
- JIS: Primarily utilize metric threads, which are standardized in millimeters. This aligns with the metric system commonly used in many parts of the world.
- JIC: Typically employ Unified National Fine (UNF) threads, a standard system of measurement used in North America and other regions.
3. Origin and Common Usage:
- JIS: Originated in Japan and are widely used in Japanese and other Asian markets. They are commonly found in equipment manufactured in these regions.
- JIC: Developed in North America, JIC fittings are prevalent in North American and many other parts of the world. They are widely used in industrial machinery, construction equipment, and various other applications.
4. Interchangeability:
- Limited Interchangeability: Due to the differences in flare angle and thread type, JIS and JIC fittings are generally not directly interchangeable. Attempting to use a JIS fitting in a JIC system, or vice versa, can lead to improper sealing, leaks, and potential system failures.
5. Standards and Quality:
- JIS: Adhere to the rigorous standards set by the Japanese Industrial Standards, ensuring consistent quality and performance across different manufacturers.
- JIC: Conform to industry standards, such as those established by the Society of Automotive Engineers (SAE), ensuring compatibility and interchangeability within the JIC standard.
6. Sealing Surface Quality:
- JIS: The quality of the sealing surfaces on JIS fittings can vary depending on the manufacturing process and adherence to standards.
- JIC: JIC fittings typically adhere to stringent quality control standards, ensuring smooth and consistent sealing surfaces. This minimizes the risk of leaks and enhances the overall performance of the hydraulic system.
IS vs JIC Fittings Comparison
Feature | JIS | JIC |
---|---|---|
Flare Angle | 30 degrees | 37 degrees |
Thread Type | Metric | UNF (Unified National Fine) |
Origin | Japan | North America |
Common Usage | Asian Markets | North America & Globally |
Interchangeability | Limited | Limited |
Sealing | Generally effective, may have limitations in high-pressure applications | Stronger seal due to 37-degree flare angle, better suited for high-pressure applications |
Key Takeaway: Understanding these key differences is crucial for selecting the appropriate fittings for your hydraulic system. Always consult the relevant standards and manufacturer specifications to ensure compatibility and safety.
How to Choose JIS Hydraulic Fittings vs JIC
Choosing Between JIS and JIC Hydraulic Fittings
Selecting the right hydraulic fittings is crucial for the safety, reliability, and performance of your system. Here’s how to decide between JIS and JIC fittings:
1. Determine Your Application:
- Geographic Location: If your equipment is primarily used in Japan or other Asian markets, JIS fittings are likely the more suitable choice.
- Equipment Origin: If your equipment is manufactured in Japan or other parts of Asia, it’s highly probable that it utilizes JIS fittings.
- Industry Standards: Some industries may have specific standards or preferences for either JIS or JIC fittings.
2. Consider Pressure and Temperature Requirements:
- High-Pressure Applications: JIC fittings, with their 37-degree flare angle, generally offer better sealing capabilities for high-pressure applications.
- Temperature Extremes: Choose fittings from materials that can withstand the expected temperature range of your system. Stainless steel is often preferred for extreme temperatures.
3. Evaluate Compatibility:
- Existing System: If you’re working with an existing hydraulic system, determine the type of fittings currently in use. It’s generally best to maintain consistency within the system to avoid compatibility issues.
- Equipment Manufacturer Recommendations: Consult the equipment manufacturer‘s recommendations for compatible fittings. They may have specific requirements or preferences.
4. Consult with Experts:
- Hydraulic Specialists: If you’re unsure which type of fitting is best for your application, consult with a hydraulic specialist or engineer. They can provide expert guidance based on your specific needs and system requirements.
5. Prioritize Safety and Reliability:
- Choose high-quality fittings: Always select fittings from reputable manufacturers that adhere to relevant industry standards (JIS or JIC).
- Proper Installation: Ensure proper installation techniques are followed to prevent leaks and ensure system integrity.
By carefully considering these factors, you can make an informed decision about whether JIS or JIC fittings are the best choice for your specific application.
Conclusion
In conclusion, JIS and JIC fittings are distinct standards for hydraulic components, each with its own specific design and application. While both serve to connect components within hydraulic systems, key differences such as flare angles, thread types, and origins necessitate careful consideration when selecting fittings. Using the wrong type of fitting can lead to compatibility issues, leaks, and potential system failures.
It’s crucial to always adhere to the appropriate standards and consult manufacturer specifications to ensure the correct selection and installation of hydraulic fittings. By carefully considering the specific requirements of your application and choosing the right fittings, you can ensure optimal system performance, reliability, and safety.
Need high-quality JIS or JIC hydraulic fittings for your next project? Contact us today for a free quote and let our experienced team assist you in selecting the perfect fittings for your specific needs. We offer a wide range of options, including both standard and custom fittings, to meet the demands of your hydraulic system.