-239 BLACK FKM 90D O-RING

This o-ring is supplied in AS568-239 black Viton® (FKM) 90 Shore A supplied with an inside diameter of 3.609 in (91.67 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.887 in (98.73 mm), catalogued under part number V90239. It compresses into its gland to block fluid or gas migration across a joint.

Expect good resistance to chlorinated solvents, many acids, and aromatic hydrocarbons. That behavior comes from the compound itself: Viton® (FKM) is widely chosen for the industry benchmark where nitrile reaches its thermal limit and long service life in hot, chemically aggressive environments. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving amines or ketones and esters call for a different compound.

It sees regular use in aerospace, high-temperature process equipment, and oil and gas.

Order part number V90239, sold individually. Unit weight is approximately 5.3035 g and nominal inside diameter is listed as 3 5/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.