8.4MM CS X 174.5MM ID BLACK BUNA 70D

Part number H8.4X174.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 174.5 mm (6.87 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 191.3 mm (7.53 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. Source specification: Metric O-RING, JIS P175.

This material stands up to propane and butane, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or ozone and direct sunlight.

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

Stocked as H8.4X174.5 and sold individually. Unit weight is approximately 38.742 g. 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.