3.1MM CS X 54.4MM ID BLACK BUNA 70D

H3.1X54.4 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 54.4 mm (2.142 in), a cross section of 3.1 mm (0.122 in), and an outside diameter of 60.6 mm (2.39 in). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint. The catalog record notes: Metric O-RING, JIS G55.

Expect good resistance to greases and lubricants, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ozone and direct sunlight or polar solvents call for a different compound.

Maintenance and OEM teams specify it across agricultural equipment, fluid power, and hydraulic and pneumatic systems.

Stocked as H3.1X54.4 and sold individually. Unit weight is approximately 1.7172 g. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.