AS568-020 O-Ring

Inside diameter 0.864″
Cross-section 0.070″
Outside diameter 1.004″
Metric (ID × CS) 21.95 × 1.78 mm

OD is derived: ID + 2 × CS = 0.864″ + 2 × 0.070″ = 1.004″.

Neighboring sizes (CS 0.070″ series)

Dash ID OD ID mm vs -020
-018 0.739″ 0.879″ 18.77 ID −0.125″
-019 0.801″ 0.941″ 20.35 ID −0.063″
-020 0.864″ 1.004″ 21.95
-021 0.926″ 1.066″ 23.52 ID +0.062″
-022 0.989″ 1.129″ 25.12 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.