-390 BLACK BUNA 90D O-RING

H90390 is an AS568-390 black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The material holds up against water, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

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

This item is sold individually under part number H90390. Unit weight is approximately 52.643 g and nominal inside diameter is listed as 21 inch. Check the compound against your process media, pressure and temperature before committing to a design.