AS568-102 O-Ring

Inside diameter 0.049″
Cross-section 0.103″
Outside diameter 0.255″
Metric (ID × CS) 1.24 × 2.62 mm

OD is derived: ID + 2 × CS = 0.049″ + 2 × 0.103″ = 0.255″.

Neighboring sizes (CS 0.103″ series)

Dash ID OD ID mm vs -102
-102 0.049″ 0.255″ 1.24
-103 0.081″ 0.287″ 2.06 ID +0.032″
-104 0.112″ 0.318″ 2.84 ID +0.063″
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.