Q-018 BUNA 70 Q RING

This quad-ring is supplied in AS568-018 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 0.739 in (18.77 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.879 in (22.33 mm), catalogued under part number QH70018. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Buna-N (Nitrile) offers strong abrasion and tear resistance, low compression set under sustained load. Expect good resistance to propane and butane, petroleum-based oils, and many alcohols. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with polar solvents or ozone and direct sunlight. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

You will find this material specified across agricultural equipment, general industrial maintenance, and automotive.

Reference part number QH70018 when ordering; the item is sold individually. Unit weight is approximately 0.2013 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.