-311 BLACK FKM 90D O-RING

V90311 is an AS568-311 black Viton® (FKM) 90 Shore A O-Ring with an inside diameter of 0.537 in (13.64 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.957 in (24.31 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

As a material, Viton® (FKM) is valued for the industry benchmark where nitrile reaches its thermal limit and very low compression set at elevated temperature. The material holds up against engine and transmission fluids, chlorinated solvents, and petroleum oils and fuels. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. It is not the right choice where hot water and steam or amines are present.

Maintenance and OEM teams specify it across chemical processing, aerospace, and high-temperature process equipment.

V90311 ships individually. Unit weight is approximately 2.4497 g and nominal inside diameter is listed as 9/16 inch. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.