Q-253 BUNA 70 Q RING

This quad-ring is supplied in AS568-253 black Buna-N (Nitrile) 70 Shore A built to 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), catalogued under part number QH70253. It provides a dual sealing band on each contact face for improved reliability.

Buna-N (Nitrile) is valued for low compression set under sustained load, reliable performance in both static and dynamic service. This material stands up to greases and lubricants, many alcohols, and propane and butane. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or ozone and direct sunlight are present. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and a parting line located away from the sealing surface.

Maintenance and OEM teams specify it across construction equipment, agricultural equipment, and automotive.

This item is sold individually under part number QH70253. Unit weight is approximately 5.1511 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.