AS568-031 O-Ring

Inside diameter 1.739″
Cross-section 0.070″
Outside diameter 1.879″
Metric (ID × CS) 44.17 × 1.78 mm

OD is derived: ID + 2 × CS = 1.739″ + 2 × 0.070″ = 1.879″.

Neighboring sizes (CS 0.070″ series)

Dash ID OD ID mm vs -031
-029 1.489″ 1.629″ 37.82 ID −0.250″
-030 1.614″ 1.754″ 41.00 ID −0.125″
-031 1.739″ 1.879″ 44.17
-032 1.864″ 2.004″ 47.35 ID +0.125″
-033 1.989″ 2.129″ 50.52 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.