Buna 70-348-Black-Pk5

Ordered as SB-H70348-5, this is an AS568-348 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 4.35 in (110.49 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.77 in (121.16 mm). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. Source specification: 4.75IDX4.375"ODX.1875"CS.

As a material, Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. The compound resists water, petroleum-based oils, and propane and butane. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or ozone and direct sunlight call for a different compound.

It sees regular use in automotive, hydraulic and pneumatic systems, and general industrial maintenance.

Stocked as SB-H70348-5 and sold by the bag. Nominal inside diameter is listed as 4 3/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.