AS568-208 O-Ring

Inside diameter 0.609″
Cross-section 0.139″
Outside diameter 0.887″
Metric (ID × CS) 15.47 × 3.53 mm

OD is derived: ID + 2 × CS = 0.609″ + 2 × 0.139″ = 0.887″.

Neighboring sizes (CS 0.139″ series)

Dash ID OD ID mm vs -208
-206 0.484″ 0.762″ 12.29 ID −0.125″
-207 0.546″ 0.824″ 13.87 ID −0.063″
-208 0.609″ 0.887″ 15.47
-209 0.671″ 0.949″ 17.04 ID +0.062″
-210 0.734″ 1.012″ 18.64 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.