AS568-331 O-Ring
Inside diameter 2.225″
Cross-section 0.210″
Outside diameter 2.645″
Metric (ID × CS) 56.52 × 5.33 mm
OD is derived: ID + 2 × CS = 2.225″ + 2 × 0.210″ = 2.645″.
Neighboring sizes (CS 0.210″ series)
| Dash | ID | OD | ID mm | vs -331 |
|---|---|---|---|---|
| -329 | 1.975″ | 2.395″ | 50.16 | ID −0.250″ |
| -330 | 2.100″ | 2.520″ | 53.34 | ID −0.125″ |
| -331 | 2.225″ | 2.645″ | 56.52 | — |
| -332 | 2.350″ | 2.770″ | 59.69 | ID +0.125″ |
| -333 | 2.475″ | 2.895″ | 62.87 | ID +0.250″ |