JIS B 2401 Metric O-Rings Size Chart
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.
For a complete listing of all metric o-ring sizes, visit our
Metric O-Ring Cross Reference Table.
Click on a Series below to view the size chart for that particular series, or scroll down to see the size chart for all JIS sizes sorted from smallest to largest, C/S then I.D.
- JIS: P Series – Moving (dynamic)
- JIS: G Series – Fixed (static)
- JIS: S Series – Special Sizes
- JIS: V Series – Vacuum Flange

