4.5MM CS X 21MM ID BLACK BUNA 70D

Part number H4.5X21 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 21 mm (0.827 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 30 mm (1.18 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Buna-N (Nitrile) is widely chosen for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The compound resists water, many alcohols, and propane and butane. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving automotive brake fluid or ketones call for a different compound.

You will find this material specified across automotive, construction equipment, and general industrial maintenance.

This item is sold individually under part number H4.5X21. Check the compound against your process media, pressure and temperature before committing to a design.