AS568-380 O-Ring

Inside diameter 11.475″
Cross-section 0.210″
Outside diameter 11.895″
Metric (ID × CS) 291.46 × 5.33 mm

OD is derived: ID + 2 × CS = 11.475″ + 2 × 0.210″ = 11.895″.

Neighboring sizes (CS 0.210″ series)

Dash ID OD ID mm vs -380
-378 10.475″ 10.895″ 266.06 ID −1.000″
-379 10.975″ 11.395″ 278.76 ID −0.500″
-380 11.475″ 11.895″ 291.46
-381 11.975″ 12.395″ 304.16 ID +0.500″
-382 12.975″ 13.395″ 329.56 ID +1.500″

Same ID, other cross-sections

Data provenance. SAE AS568, Aerospace Size Standard for O-rings (SAE International). Nominal dimensions per AS568; size tolerances vary by dash number and are not yet cataloged. Groove/gland design depends on the application — consult a gland design reference. See all data sources.