*4028-366Y MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-028 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 1.364 in (34.65 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.504 in (38.2 mm), catalogued under part number HQ4028. It delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to water, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: 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). It is not the right choice where ozone and direct sunlight or polar solvents are present. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

Maintenance and OEM teams specify it across general industrial maintenance, hydraulic and pneumatic systems, and automotive.

Order part number HQ4028, sold individually. Check the compound against your process media, pressure and temperature before committing to a design.