AS568-355 O-Ring

Inside diameter 5.225″
Cross-section 0.210″
Outside diameter 5.645″
Metric (ID × CS) 132.71 × 5.33 mm

OD is derived: ID + 2 × CS = 5.225″ + 2 × 0.210″ = 5.645″.

Neighboring sizes (CS 0.210″ series)

Dash ID OD ID mm vs -355
-353 4.975″ 5.395″ 126.36 ID −0.250″
-354 5.100″ 5.520″ 129.54 ID −0.125″
-355 5.225″ 5.645″ 132.71
-356 5.350″ 5.770″ 135.89 ID +0.125″
-357 5.475″ 5.895″ 139.06 ID +0.250″

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.