AS568-026 O-Ring

Inside diameter 1.239″
Cross-section 0.070″
Outside diameter 1.379″
Metric (ID × CS) 31.47 × 1.78 mm

OD is derived: ID + 2 × CS = 1.239″ + 2 × 0.070″ = 1.379″.

Neighboring sizes (CS 0.070″ series)

Dash ID OD ID mm vs -026
-024 1.114″ 1.254″ 28.30 ID −0.125″
-025 1.176″ 1.316″ 29.87 ID −0.063″
-026 1.239″ 1.379″ 31.47
-027 1.301″ 1.441″ 33.05 ID +0.062″
-028 1.364″ 1.504″ 34.65 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.