-390 BLACK BUNA 70D O-RING

Ordered as H70MD390, this is an AS568-390 black Buna-N (Nitrile) 70 Shore A O-Ring built to 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). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists hydraulic fluids, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in ketones or automotive brake fluid.

This item is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include fluid power, general industrial maintenance, and hydraulic and pneumatic systems.

This item is sold individually under part number H70MD390. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.