AS568-385 O-Ring

Inside diameter 15.955″
Cross-section 0.210″
Outside diameter 16.375″
Metric (ID × CS) 405.26 × 5.33 mm

OD is derived: ID + 2 × CS = 15.955″ + 2 × 0.210″ = 16.375″.

Neighboring sizes (CS 0.210″ series)

Dash ID OD ID mm vs -385
-383 13.975″ 14.395″ 354.96 ID −1.980″
-384 14.975″ 15.395″ 380.36 ID −0.980″
-385 15.955″ 16.375″ 405.26
-386 16.955″ 17.375″ 430.66 ID +1.000″
-387 17.955″ 18.375″ 456.06 ID +2.000″

Same ID, other cross-sections

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.