AS568-033 O-Ring

Inside diameter 1.989″
Cross-section 0.070″
Outside diameter 2.129″
Metric (ID × CS) 50.52 × 1.78 mm

OD is derived: ID + 2 × CS = 1.989″ + 2 × 0.070″ = 2.129″.

Neighboring sizes (CS 0.070″ series)

Dash ID OD ID mm vs -033
-031 1.739″ 1.879″ 44.17 ID −0.250″
-032 1.864″ 2.004″ 47.35 ID −0.125″
-033 1.989″ 2.129″ 50.52
-034 2.114″ 2.254″ 53.70 ID +0.125″
-035 2.239″ 2.379″ 56.87 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.