5.7MM CS X 399.3MM ID BLACK FKM 75D

Ordered as V5.7X399.3, this is a black Viton® (FKM) 75 Shore A O-Ring built to an inside diameter of 399.3 mm (15.72 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 410.7 mm (16.17 in). The o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. The catalog record notes: Metric O-RING, JIS G400.

This material stands up to petroleum oils and fuels, engine and transmission fluids, and many acids. That behavior comes from the compound itself: Viton® (FKM) is widely chosen for long service life in hot, chemically aggressive environments and very low compression set at elevated temperature. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C).

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

Order part number V5.7X399.3, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.