-421 BLACK FKM 75D O-RING

This o-ring is supplied in AS568-421 black Viton® (FKM) 75 Shore A with an inside diameter of 3.975 in (100.97 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.525 in (114.94 mm), catalogued under part number V75421. It delivers dependable bidirectional sealing in a compact groove envelope.

The compound resists aggressive chemicals, engine and transmission fluids, and many acids. That behavior comes from the compound itself: Viton® (FKM) delivers outstanding high-temperature capability and the industry benchmark where nitrile reaches its thermal limit. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C).

Typical settings include chemical processing, automotive fuel systems, and semiconductor equipment.

Reference part number V75421 when ordering; the item is sold individually. Nominal inside diameter is listed as 4 inch. Check the compound against your process media, pressure and temperature before committing to a design.