-370 BLACK BUNA 90D O-RING

Ordered as H90370, this is an AS568-370 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 8.225 in (208.92 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 8.645 in (219.58 mm). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

It resists water, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and 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 sees regular use in automotive, general industrial maintenance, and agricultural equipment.

Reference part number H90370 when ordering; the item is sold individually. Unit weight is approximately 19.61 g and nominal inside diameter is listed as 8 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.