Universal O-ring Standard Size Chart
Standard size o-rings are often the most commonly used, widely available, and highest inventory size options. There are many sizing standards that have been developed by various nations and industries around the world. Marco's Universal O-ring Standard Size Chart combines some of the most popular standard size specifications including USA AS568, British BS 1806, Japanese JIS B 2401, Dupont™ K Dash, and Parker™ 5 Dash. This combined size chart allows you to filter by dimensions and standard size codes to quickly find the size you're looking for. Order o-rings online from the world's largest inventory network including custom o-rings typically without tooling fees. O-ring tolerances vary by use, please refer to our o-ring tolerance pages pages or contact us for responsive expert service.
| Size | CS (IN) | ID (IN) | OD (IN) | CS (MM) | ID (MM) | OD (MM) | USA AS568 | Japanese JIS B 2401 | British BS 1806 | 5 Dash | K Dash |
|---|---|---|---|---|---|---|---|---|---|---|---|
.64X10.8 | 0.025 | 0.425 | 0.476 | 0.64 | 10.8 | 12.08 | 218 | ||||
.79X10.41 | 0.031 | 0.41 | 0.472 | 0.79 | 10.41 | 11.99 | 134 | ||||
.79X13.36 | 0.031 | 0.526 | 0.588 | 0.79 | 13.36 | 14.94 | 135 | ||||
.79X16.33 | 0.031 | 0.643 | 0.705 | 0.79 | 16.33 | 17.91 | 136 | ||||
.79X19.69 | 0.031 | 0.775 | 0.837 | 0.79 | 19.69 | 21.27 | 137 | ||||
.79X22.81 | 0.031 | 0.898 | 0.96 | 0.79 | 22.81 | 24.39 | 138 | ||||
.79X25.07 | 0.031 | 0.987 | 1.049 | 0.79 | 25.07 | 26.65 | 139 | ||||
.79X28.24 | 0.031 | 1.112 | 1.174 | 0.79 | 28.24 | 29.82 | 140 | ||||
.79X31.14 | 0.031 | 1.226 | 1.288 | 0.79 | 31.14 | 32.72 | 141 | ||||
.79X8.43 | 0.031 | 0.332 | 0.394 | 0.79 | 8.43 | 10.01 | 133 | ||||
.91X1.78 | 0.036 | 0.07 | 0.142 | 0.91 | 1.78 | 3.6 | 187 | ||||
.91X7.92 | 0.036 | 0.312 | 0.383 | 0.91 | 7.92 | 9.74 | 204 | ||||
.97X2.54 | 0.038 | 0.1 | 0.176 | 0.97 | 2.54 | 4.48 | 101 | ||||
.97X2.95 | 0.038 | 0.116 | 0.193 | 0.97 | 2.95 | 4.89 | 102 | ||||
.97X3.91 | 0.038 | 0.154 | 0.23 | 0.97 | 3.91 | 5.85 | 148 |
