*4235-366Y MINNESOTA RUBBER QUAD RING

HQ4235 is an AS568-235 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 3.109 in (78.97 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 3.387 in (86.03 mm). In service, this quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

This material stands up to propane and butane, many alcohols, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or automotive brake fluid. The profile itself contributes a parting line located away from the sealing surface and lower compressive load required to achieve a seal.

It sees regular use in general industrial maintenance, agricultural equipment, and fluid power.

Stocked as HQ4235 and sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.