AS568-313 O-Ring

Inside diameter 0.662″
Cross-section 0.210″
Outside diameter 1.082″
Metric (ID × CS) 16.81 × 5.33 mm

OD is derived: ID + 2 × CS = 0.662″ + 2 × 0.210″ = 1.082″.

Neighboring sizes (CS 0.210″ series)

Dash ID OD ID mm vs -313
-311 0.537″ 0.957″ 13.64 ID −0.125″
-312 0.600″ 1.020″ 15.24 ID −0.062″
-313 0.662″ 1.082″ 16.81
-314 0.725″ 1.145″ 18.41 ID +0.063″
-315 0.787″ 1.207″ 19.99 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.