-373 BLACK BUNA 70D O-RING

Ordered as H70MD373, this is an AS568-373 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 8.975 in (227.97 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.395 in (238.63 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.

The material holds up against greases and lubricants, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is known for strong abrasion and tear resistance, low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or ozone and direct sunlight call for a different compound.

The compound is metal detectable for HACCP and foreign-body control programs. It sees regular use in hydraulic and pneumatic systems, automotive, and general industrial maintenance.

H70MD373 ships individually. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.