AS568-120 O-Ring

Inside diameter 0.987″
Cross-section 0.103″
Outside diameter 1.193″
Metric (ID × CS) 25.07 × 2.62 mm

OD is derived: ID + 2 × CS = 0.987″ + 2 × 0.103″ = 1.193″.

Neighboring sizes (CS 0.103″ series)

Dash ID OD ID mm vs -120
-118 0.862″ 1.068″ 21.89 ID −0.125″
-119 0.924″ 1.130″ 23.47 ID −0.063″
-120 0.987″ 1.193″ 25.07
-121 1.049″ 1.255″ 26.64 ID +0.062″
-122 1.112″ 1.318″ 28.24 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.