Buna 70-248-Black-Pk2

APG stocks the SB-H70248-2, an AS568-248 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 4.734 in (120.24 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.012 in (127.3 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint. Supplementary detail from the product record: 5IDX4.75"ODX.125"CS.

It resists hydraulic fluids, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in automotive brake fluid or ozone and direct sunlight.

Typical settings include construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Stocked as SB-H70248-2 and sold by the bag. Nominal inside diameter is listed as 4 3/4 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.