AS568-145 O-Ring

Inside diameter 2.550″
Cross-section 0.103″
Outside diameter 2.756″
Metric (ID × CS) 64.77 × 2.62 mm

OD is derived: ID + 2 × CS = 2.550″ + 2 × 0.103″ = 2.756″.

Neighboring sizes (CS 0.103″ series)

Dash ID OD ID mm vs -145
-143 2.425″ 2.631″ 61.59 ID −0.125″
-144 2.487″ 2.693″ 63.17 ID −0.063″
-145 2.550″ 2.756″ 64.77
-146 2.612″ 2.818″ 66.34 ID +0.062″
-147 2.675″ 2.881″ 67.94 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.