AS568-257 O-Ring
Inside diameter 5.859″
Cross-section 0.139″
Outside diameter 6.137″
Metric (ID × CS) 148.82 × 3.53 mm
OD is derived: ID + 2 × CS = 5.859″ + 2 × 0.139″ = 6.137″.
Neighboring sizes (CS 0.139″ series)
| Dash | ID | OD | ID mm | vs -257 |
|---|---|---|---|---|
| -255 | 5.609″ | 5.887″ | 142.47 | ID −0.250″ |
| -256 | 5.734″ | 6.012″ | 145.64 | ID −0.125″ |
| -257 | 5.859″ | 6.137″ | 148.82 | — |
| -258 | 5.984″ | 6.262″ | 151.99 | ID +0.125″ |
| -259 | 6.234″ | 6.512″ | 158.34 | ID +0.375″ |