568-387 FKM 75 SQUARE CUT RINGS

This quad-ring is supplied in AS568-387 black Viton® (FKM) 70 Shore A square profile measuring an inside diameter of 17.955 in (456.06 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 18.375 in (466.73 mm), catalogued under part number SV70387. It delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to aggressive chemicals, aromatic hydrocarbons, and engine and transmission fluids. That behavior comes from the compound itself: Viton® (FKM) is valued for the industry benchmark where nitrile reaches its thermal limit, excellent resistance to compression set and permeation. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Verify compatibility before use with hot water and steam or ketones and esters.

Maintenance and OEM teams specify it across automotive fuel systems, oil and gas, and chemical processing.

SV70387 ships individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.