JIS B 2401 O-Ring
Explore JIS B 2401, the Japanese standard for O-ring sizes, tolerances, and material designations. Find JIS O-rings, cross-reference information, and sealing solutions for industrial, automotive, and OEM applications.
JIS B 2401 is the Japanese Industrial Standard that defines O-ring dimensions, size designations, tolerances, and material classifications for metric sealing applications. Widely used throughout Japan and Asia, this standard provides a consistent sizing system that allows engineers and OEMs to specify interchangeable O-rings, gaskets, seals, and custom molded parts with confidence. JIS B 2401 supports reliable sealing performance by standardizing inside diameters, cross sections, and dimensional tolerances across industrial, automotive, hydraulic, pneumatic, and semiconductor applications. Engineers frequently use JIS B 2401 to cross-reference metric O-ring sizes with other international standards, simplifying replacement, sourcing, and global equipment maintenance.
JIS B 2401 O-rings are manufactured in a broad range of elastomer materials including FKM, FFKM, NBR, HNBR, EPDM, Silicone (VMQ), Fluorosilicone (FVMQ/PVMQ), Aflas® (FEPM), Neoprene (CR), and other specialty compounds selected according to temperature, chemical compatibility, and operating environment. These materials are commonly used in O-rings, gaskets, seals, and custom molded components for automotive, industrial machinery, semiconductor equipment, fluid handling systems, and OEM manufacturing. JIS B 2401 is often referenced alongside ISO 3601, ASTM D2000, and AS568 when selecting replacement seals or designing equipment for global markets, helping ensure dimensional interchangeability and dependable sealing performance across a wide range of applications.
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