*4358-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4358, an AS568-358 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 5.6 in (142.24 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 6.02 in (152.91 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

The material holds up against propane and butane, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones 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 hydraulic and pneumatic systems, agricultural equipment, and automotive.

Stocked as HQ4358 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. 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.