8.4MM CS X 164.1MM ID BLACK BUNA 70D

The H8.4X164.1 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 164.1 mm (6.461 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 180.9 mm (7.12 in). This o-ring compresses into its gland to block fluid or gas migration across a joint.

This material stands up to hydraulic fluids, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for strong abrasion and tear resistance, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in automotive brake fluid or ozone and direct sunlight.

You will find this material specified across general industrial maintenance, agricultural equipment, and fluid power.

Stocked as H8.4X164.1 and sold individually. Unit weight is approximately 36.946 g. Check the compound against your process media, pressure and temperature before committing to a design. 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.