-444 BLACK BUNA 90D O-RING

Part number H90444 is an AS568-444 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 7.725 in (196.22 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.275 in (210.19 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

As a material, Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and low compression set under sustained load. The compound resists many alcohols, water, and propane and butane. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound.

Common environments for this compound include fluid power, construction equipment, and general industrial maintenance.

Stocked as H90444 and sold individually. Unit weight is approximately 34.168 g and nominal inside diameter is listed as 7 3/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.