-249 BLACK FKM 75D O-RING

Ordered as V70249, this is an AS568-249 black Viton® (FKM) 75 Shore A O-Ring measuring an inside diameter of 4.859 in (123.42 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.137 in (130.48 mm). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

It resists engine and transmission fluids, chlorinated solvents, and aggressive chemicals. That behavior comes from the compound itself: Viton® (FKM) is known for long service life in hot, chemically aggressive environments and the industry benchmark where nitrile reaches its thermal limit. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). It should not be specified for service in hot water and steam or ketones and esters.

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

Reference part number V70249 when ordering; the item is sold individually. Unit weight is approximately 7.217 g and nominal inside diameter is listed as 4 7/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.