-253 BLACK BUNA 70D O-RING

The H70253 is an AS568-253 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 5.359 in (136.12 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.637 in (143.18 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.

Expect good resistance to petroleum-based oils, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. 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, hydraulic and pneumatic systems, and general industrial maintenance.

This item is sold individually under part number H70253. Unit weight is approximately 5.2438 g and nominal inside diameter is listed as 5 3/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.