AS568-168 O-Ring

Inside diameter 7.237″
Cross-section 0.103″
Outside diameter 7.443″
Metric (ID × CS) 183.82 × 2.62 mm

OD is derived: ID + 2 × CS = 7.237″ + 2 × 0.103″ = 7.443″.

Neighboring sizes (CS 0.103″ series)

Dash ID OD ID mm vs -168
-166 6.737″ 6.943″ 171.12 ID −0.500″
-167 6.987″ 7.193″ 177.47 ID −0.250″
-168 7.237″ 7.443″ 183.82
-169 7.487″ 7.693″ 190.17 ID +0.250″
-170 7.737″ 7.943″ 196.52 ID +0.500″
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.