4MM CS X 72MM ID BLACK BUNA 90D

H90M4X72 is a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 72 mm (2.835 in), a cross section of 4 mm (0.157 in), and an outside diameter of 80 mm (3.15 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The material holds up against hydraulic fluids, greases and lubricants, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is valued 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. Exposure to ozone and direct sunlight or polar solvents will shorten service life.

Typical settings include general industrial maintenance, fluid power, and automotive.

Reference part number H90M4X72 when ordering; the item is sold individually. Unit weight is approximately 4.2222 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.