4MM CS X 39.5MM ID BLACK FKM 75D

APG stocks the V4X39.5, a black Viton® (FKM) 75 Shore A O-Ring with an inside diameter of 39.5 mm (1.555 in), a cross section of 4 mm (0.157 in), and an outside diameter of 47.5 mm (1.87 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

As a material, Viton® (FKM) delivers the industry benchmark where nitrile reaches its thermal limit and very low compression set at elevated temperature. The compound resists aggressive chemicals, petroleum oils and fuels, and engine and transmission fluids. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Exposure to amines or low-molecular-weight organic acids will shorten service life.

Maintenance and OEM teams specify it across chemical processing, automotive fuel systems, and aerospace.

Stocked as V4X39.5 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.