Buna 70-239-Black-Pk50

APG stocks the SB-H70239-50, an AS568-239 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 3.609 in (91.67 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.887 in (98.73 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. This item is further identified as 3.875IDX3.625"ODX.125"CS.

It resists petroleum-based oils, water, and greases and lubricants. Buna-N (Nitrile) offers reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Common environments for this compound include automotive, construction equipment, and hydraulic and pneumatic systems.

Reference part number SB-H70239-50 when ordering; the item is sold by the bag. Nominal inside diameter is listed as 3 5/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.