AS568-216 O-Ring

Inside diameter 1.109″
Cross-section 0.139″
Outside diameter 1.387″
Metric (ID × CS) 28.17 × 3.53 mm

OD is derived: ID + 2 × CS = 1.109″ + 2 × 0.139″ = 1.387″.

Neighboring sizes (CS 0.139″ series)

Dash ID OD ID mm vs -216
-214 0.984″ 1.262″ 24.99 ID −0.125″
-215 1.046″ 1.324″ 26.57 ID −0.063″
-216 1.109″ 1.387″ 28.17
-217 1.171″ 1.449″ 29.74 ID +0.062″
-218 1.234″ 1.512″ 31.34 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.