AS568-049 O-Ring

Inside diameter 4.989″
Cross-section 0.070″
Outside diameter 5.129″
Metric (ID × CS) 126.72 × 1.78 mm

OD is derived: ID + 2 × CS = 4.989″ + 2 × 0.070″ = 5.129″.

Neighboring sizes (CS 0.070″ series)

Dash ID OD ID mm vs -049
-047 4.489″ 4.629″ 114.02 ID −0.500″
-048 4.739″ 4.879″ 120.37 ID −0.250″
-049 4.989″ 5.129″ 126.72
-050 5.239″ 5.379″ 133.07 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.