4MM CS X 395MM ID BLACK BUNA 70D

APG stocks the H4X395, a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 395 mm (15.551 in), a cross section of 4 mm (0.157 in), and an outside diameter of 403 mm (15.87 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

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

You will find this material specified across hydraulic and pneumatic systems, agricultural equipment, and general industrial maintenance.

H4X395 ships individually. Unit weight is approximately 19.238 g. Review your operating media and conditions against this specification before installation.