Q-429 BUNA 70 Q RING

This quad-ring is supplied in AS568-429 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 4.975 in (126.37 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.525 in (140.34 mm), catalogued under part number QH70429. It delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to water, many alcohols, and greases and lubricants. Buna-N (Nitrile) offers reliable performance in both static and dynamic service, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, agricultural equipment, and fluid power.

Reference part number QH70429 when ordering; the item is sold individually. Unit weight is approximately 19.63 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.