3MM CS X 38.5MM ID BLACK BUNA 70D

Ordered as H3X38.5, this is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 38.5 mm (1.516 in), a cross section of 3 mm (0.118 in), and an outside diameter of 44.5 mm (1.75 in). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

It resists many alcohols, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or strong acids call for a different compound.

Common environments for this compound include agricultural equipment, hydraulic and pneumatic systems, and automotive.

H3X38.5 ships individually. Unit weight is approximately 1.1441 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.