AS568-280 O-Ring

Inside diameter 13.984″
Cross-section 0.139″
Outside diameter 14.262″
Metric (ID × CS) 355.19 × 3.53 mm

OD is derived: ID + 2 × CS = 13.984″ + 2 × 0.139″ = 14.262″.

Neighboring sizes (CS 0.139″ series)

Dash ID OD ID mm vs -280
-278 11.984″ 12.262″ 304.39 ID −2.000″
-279 12.984″ 13.262″ 329.79 ID −1.000″
-280 13.984″ 14.262″ 355.19
-281 14.984″ 15.262″ 380.59 ID +1.000″
-282 15.955″ 16.233″ 405.26 ID +1.971″
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.