JIS B 2401 is a Japanese Industrial Standard for O-Ring sizes. This standard, often referred to as “Japanese Metrics”, is organized into four series, based on their application. The O-Rings in each section have ascending number codes to complete the size reference.


- JIS: P Series Moving (dynamic)
- JIS: G Series Fixed (static)
- JIS: S Series Special Sizes
- JIS: V Series Vacuum Flange
- All JIS Sizes Sorted by Size


Nitrile 70 rubber (NBR) is the general term for Acrylonitrile Butadiene Copolymer. Nitrile is the most widely used and economical elastomer. Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion resistance. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.


P26 - 25.7mm x CS 3.5mm
P27 - 26.7mm x CS 3.5mm
P28 - 27.7mm x CS 3.5mm
P29 - 28.7mm x CS 3.5mm
P30 - 29.7mm x CS 3.5mm


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