Q-357 BUNA 70 Q RING

Part number QH70357 is an AS568-357 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 5.475 in (139.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.895 in (149.73 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

The compound resists propane and butane, many alcohols, and water. Buna-N (Nitrile) is known for strong abrasion and tear resistance, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or ozone and direct sunlight will shorten service life. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Common environments for this compound include hydraulic and pneumatic systems, general industrial maintenance, and automotive.

Stocked as QH70357 and sold individually. Unit weight is approximately 12.453 g and nominal inside diameter is listed as 5 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.