3.1MM CS X 39.4MM ID BLACK BUNA 90D

APG stocks the H90M3.1X39.4, a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 39.4 mm (1.551 in), a cross section of 3.1 mm (0.122 in), and an outside diameter of 45.6 mm (1.8 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. Source specification: Metric O-RING, JIS G40.

Buna-N (Nitrile) is specified here for economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. The compound resists water, petroleum-based oils, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or strong acids.

Maintenance and OEM teams specify it across automotive, construction equipment, and general industrial maintenance.

Stocked as H90M3.1X39.4 and sold individually. Unit weight is approximately 1.3999 g. Check the compound against your process media, pressure and temperature before committing to a design.