4MM CS X 440MM ID BLACK BUNA 70D

APG stocks the H4X440, a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 440 mm (17.323 in), a cross section of 4 mm (0.157 in), and an outside diameter of 448 mm (17.64 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against petroleum-based oils, greases and lubricants, and many alcohols. Buna-N (Nitrile) is known for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ketones or automotive brake fluid are present.

It sees regular use in fluid power, construction equipment, and automotive.

Stocked as H4X440 and sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.