AS568-177 O-Ring

Inside diameter 9.487″
Cross-section 0.103″
Outside diameter 9.693″
Metric (ID × CS) 240.97 × 2.62 mm

OD is derived: ID + 2 × CS = 9.487″ + 2 × 0.103″ = 9.693″.

Neighboring sizes (CS 0.103″ series)

Dash ID OD ID mm vs -177
-175 8.987″ 9.193″ 228.27 ID −0.500″
-176 9.237″ 9.443″ 234.62 ID −0.250″
-177 9.487″ 9.693″ 240.97
-178 9.737″ 9.943″ 247.32 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.