When examining JIS and JIC fittings, it’s crucial to note that while they may have similar flared tube connectors, they have distinct differences that make them non-interchangeable. Let’s delve deeper into understanding these differences across standards, sealing, and usage.
Standards Difference:
JIS Fittings:
JIS fittings adhere to Japanese industry standards, such as JIS B8363. These are tailored for compatibility and use with Japanese industrial specifications.
JIC Fittings:
On the other hand, JIC fittings conform to SAE J514 and MIL-DTL-18866 standards, ensuring their suitability for North American and other international markets.
Sealing Difference:
JIS Adapter Fittings:
JIS adapter fittings feature BSPP thread with a 30-degree flare tube connector, designed for specific sealing requirements within Japanese and Korean heavy machinery.
JIC Fittings Size Chart
JIC Adapter Fittings:
Conversely, JIC adapter fittings feature UN thread with a 37-degree flare seating surface, making them ideal for high-pressure applications (up to 10,000 psi). This difference in sealing surfaces further highlights the incompatibility between JIS and JIC fittings.
Usage Difference:
JIS Hydraulic Fittings:
Primarily used in Japanese and Korean heavy equipment like Komatsu, Kobelco, Hitachi, and Kubota, JIS hydraulic fittings are often utilized as hose adapters. Their use is most prevalent within the regions where these equipment manufacturers are based.
JIC Hydraulic Fittings:
JIC hydraulic fittings find extensive application in the North American market and are gaining popularity worldwide. Prominent heavy equipment manufacturers like Caterpillar and John Deere often use JIC fittings as tube connector fittings due to their reliable performance in high-pressure environments.
In Conclusion:
Despite their similarities, JIS and JIC fittings are two different tubing and hose connection systems, each tailored to specific industrial and regional standards, sealing requirements, and equipment types. Their non-interchangeability emphasizes the importance of selecting the right fitting type to ensure the efficiency and safety of hydraulic systems.
