-391 BLACK FKM 75D O-RING

Ordered as V70391, this is an AS568-391 black Viton® (FKM) 75 Shore A O-Ring with an inside diameter of 21.953 in (557.61 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 22.373 in (568.27 mm). The o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Expect good resistance to chlorinated solvents, aromatic hydrocarbons, and aggressive chemicals. Viton® (FKM) is valued for excellent resistance to compression set and permeation, long service life in hot, chemically aggressive environments. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). Applications involving ketones and esters or low-molecular-weight organic acids call for a different compound.

Maintenance and OEM teams specify it across semiconductor equipment, aerospace, and oil and gas.

Reference part number V70391 when ordering; the item is sold individually. Unit weight is approximately 71.883 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.