AS568-214 O-Ring

Inside diameter 0.984″
Cross-section 0.139″
Outside diameter 1.262″
Metric (ID × CS) 24.99 × 3.53 mm

OD is derived: ID + 2 × CS = 0.984″ + 2 × 0.139″ = 1.262″.

Neighboring sizes (CS 0.139″ series)

Dash ID OD ID mm vs -214
-212 0.859″ 1.137″ 21.82 ID −0.125″
-213 0.921″ 1.199″ 23.39 ID −0.063″
-214 0.984″ 1.262″ 24.99
-215 1.046″ 1.324″ 26.57 ID +0.062″
-216 1.109″ 1.387″ 28.17 ID +0.125″
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.