-139 BLACK BUNA 70D O-RING

H70MD139 is an AS568-139 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 2.175 in (55.25 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.381 in (60.48 mm). In service, this o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to propane and butane, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where polar solvents or ketones are present.

This item is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include construction equipment, fluid power, and hydraulic and pneumatic systems.

Order part number H70MD139, sold individually. Nominal inside diameter is listed as 2 3/16 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.