-209 BLACK BUNA 50D O-RING

Ordered as H50209, this is an AS568-209 black Buna-N (Nitrile) 50 Shore A O-Ring built to an inside diameter of 0.671 in (17.04 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.949 in (24.1 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Expect good resistance to hydraulic fluids, many alcohols, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is specified 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).

Typical settings include hydraulic and pneumatic systems, general industrial maintenance, and construction equipment.

Reference part number H50209 when ordering; the item is sold individually. 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.