AS568-270 O-Ring

Inside diameter 8.984″
Cross-section 0.139″
Outside diameter 9.262″
Metric (ID × CS) 228.19 × 3.53 mm

OD is derived: ID + 2 × CS = 8.984″ + 2 × 0.139″ = 9.262″.

Neighboring sizes (CS 0.139″ series)

Dash ID OD ID mm vs -270
-268 8.484″ 8.762″ 215.49 ID −0.500″
-269 8.734″ 9.012″ 221.84 ID −0.250″
-270 8.984″ 9.262″ 228.19
-271 9.234″ 9.512″ 234.54 ID +0.250″
-272 9.484″ 9.762″ 240.89 ID +0.500″
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.