-321 BLACK BUNA 70D O-RING

The H70MD321 is an AS568-321 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 1.162 in (29.51 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.582 in (40.18 mm). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.

The material holds up against propane and butane, greases and lubricants, and water. Buna-N (Nitrile) is known for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to strong acids or ozone and direct sunlight will shorten service life.

The compound is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include agricultural equipment, hydraulic and pneumatic systems, and general industrial maintenance.

H70MD321 ships individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. 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.