5.7MM CS X 81.2MM ID BLACK BUNA 70D

Part number H5.7X81.2 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 81.2 mm (3.197 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 92.6 mm (3.65 in). An o-ring compresses into its gland to block fluid or gas migration across a joint.

Buna-N (Nitrile) is known for strong abrasion and tear resistance, low compression set under sustained load. Expect good resistance to petroleum-based oils, hydraulic fluids, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in strong acids or ozone and direct sunlight.

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

Order part number H5.7X81.2, sold individually. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.