-178 BLACK BUNA 70D O-RING

This o-ring is supplied in AS568-178 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm), catalogued under part number H70178. It compresses into its gland to block fluid or gas migration across a joint.

It resists water, many alcohols, 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. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or strong acids will shorten service life.

Typical settings include automotive, construction equipment, and hydraulic and pneumatic systems.

This item is sold individually under part number H70178. Unit weight is approximately 5.1701 g and nominal inside diameter is listed as 9 3/4 inch. Check the compound against your process media, pressure and temperature before committing to a design.