Buna 70-442-Black-Pk2

APG stocks the SB-H70442-2, an AS568-442 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 7.225 in (183.52 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.775 in (197.49 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. Supplementary detail from the product record: 0.275CSX7.225"IDX7.775"OD.

The material holds up against petroleum-based oils, many alcohols, and propane and butane. Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or ketones.

Typical settings include general industrial maintenance, construction equipment, and automotive.

Stocked as SB-H70442-2 and sold by the bag. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.