-050 BLACK BUNA 70D O-RING

H70050 is an AS568-050 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 5.239 in (133.07 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 5.379 in (136.63 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists greases and lubricants, hydraulic fluids, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving automotive brake fluid or ketones call for a different compound.

It sees regular use in fluid power, agricultural equipment, and general industrial maintenance.

Order part number H70050, sold individually. Unit weight is approximately 0.0013 g and nominal inside diameter is listed as 5 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.