Q-252 BUNA 70 Q RING

Ordered as QH70252, this is an AS568-252 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 5.234 in (132.94 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.512 in (140 mm). The quad-ring provides a dual sealing band on each contact face for improved reliability.

The compound resists greases and lubricants, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where ketones or polar solvents are present. The profile itself contributes two sealing bands per contact face rather than one and lower compressive load required to achieve a seal.

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

Order part number QH70252, sold individually. Unit weight is approximately 5.398 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.