Q-390 BUNA 70 Q RING

QH70390 is an AS568-390 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). In service, this quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Expect good resistance to many alcohols, hydraulic fluids, and propane and butane. Buna-N (Nitrile) is specified for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or automotive brake fluid. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

It sees regular use in hydraulic and pneumatic systems, general industrial maintenance, and automotive.

Reference part number QH70390 when ordering; the item is sold individually. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.