-439 BLACK BUNA 90D O-RING

The H90439 is an AS568-439 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. This material stands up to hydraulic fluids, petroleum-based oils, and many alcohols. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or automotive brake fluid call for a different compound.

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

H90439 ships individually. Unit weight is approximately 28.923 g and nominal inside diameter is listed as 6 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.