AS568-326 O-Ring

Inside diameter 1.600″
Cross-section 0.210″
Outside diameter 2.020″
Metric (ID × CS) 40.64 × 5.33 mm

OD is derived: ID + 2 × CS = 1.600″ + 2 × 0.210″ = 2.020″.

Neighboring sizes (CS 0.210″ series)

Dash ID OD ID mm vs -326
-324 1.350″ 1.770″ 34.29 ID −0.250″
-325 1.475″ 1.895″ 37.47 ID −0.125″
-326 1.600″ 2.020″ 40.64
-327 1.725″ 2.145″ 43.81 ID +0.125″
-328 1.850″ 2.270″ 46.99 ID +0.250″
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.