-442 BLACK BUNA 70D O-RING

The H70MD442 is an AS568-442 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 7.225 in (183.52 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.775 in (197.49 mm). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to hydraulic fluids, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

The compound is metal detectable for HACCP and foreign-body control programs. Typical settings include agricultural equipment, construction equipment, and general industrial maintenance.

Stocked as H70MD442 and sold individually. Nominal inside diameter is listed as 7 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design.