Q-428 BUNA 70 Q RING

Part number QH70428 is an AS568-428 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 4.85 in (123.19 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.4 in (137.16 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

The compound resists petroleum-based oils, water, and hydraulic fluids. Buna-N (Nitrile) is widely chosen 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). Applications involving automotive brake fluid or ozone and direct sunlight call for a different compound. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

Typical settings include automotive, agricultural equipment, and general industrial maintenance.

Stocked as QH70428 and sold individually. Unit weight is approximately 19.19 g and nominal inside diameter is listed as 4 7/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.