4MM CS X 37MM ID BLACK BUNA 70D

This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 37 mm (1.457 in), a cross section of 4 mm (0.157 in), and an outside diameter of 45 mm (1.77 in), catalogued under part number H4X37. It creates a positive seal at flange, piston and rod interfaces without added hardware.

Expect good resistance to propane and butane, many alcohols, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or strong acids.

You will find this material specified across construction equipment, agricultural equipment, and general industrial maintenance.

Stocked as H4X37 and sold individually. Unit weight is approximately 1.9768 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.