4MM CS X 131MM ID BLACK BUNA 70D

This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 131 mm (5.157 in), a cross section of 4 mm (0.157 in), and an outside diameter of 139 mm (5.47 in), catalogued under part number H4X131. It seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The compound resists propane and butane, petroleum-based oils, and greases and lubricants. Buna-N (Nitrile) delivers 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).

You will find this material specified across fluid power, agricultural equipment, and automotive.

Stocked as H4X131 and sold individually. Unit weight is approximately 6 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.