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.

SHOP FOR METRIC O-RINGS

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.

All JIS Sizes – Sorted by Size

Reference C/S (MM) I.D. (MM) C/S (Inch) I.D. (Inch)

JIS – P Series

Reference C/S (MM) I.D. (MM)

JIS – G Series

Reference C/S (MM) I.D. (MM)

JIS – S Series

Reference C/S (MM) I.D. (MM)

JIS – V Series

Reference C/S (MM) I.D. (MM)
V15 4 14.5
V24 4 23.5
V34 4 33.5
V40 4 39.5
V55 4 54.5
V70 4 69
V85 4 84
V100 4 99
V120 4 119
V150 4 148.5
V175 4 173
V225 6 222.5
V275 6 272
V325 6 321.5
V380 6 376
V430 6 425.5
V480 10 475
V530 10 524.5
V585 10 579
V640 10 633.5
V690 10 683
V740 10 732.5
V790 10 782
V845 10 836.5
V950 10 940.5
V1055 10 1044