Japanese (JIS) O-rings

The Japanese Industrial Standard (JIS B 2401) lists 194 sizes of O-rings which are unique to Japan's automotive and manufacturing industries. JIS O-Rings consist of 4 series of sizes for different applications. These series include; P series for dynamic sealing applications, G series for fixed or static applications, S series for special sizes, and V series for vacuum flange applications.

Metric O-Ring Dimensions are defined by CS Cross Section and ID Inside Diameter. N2.00X012 = 2mm CS X 12mm ID