4.5MM CS X 31MM ID BLACK BUNA 70D

APG stocks the H4.5X31, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 31 mm (1.22 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 40 mm (1.57 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, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or polar solvents.

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

This item is sold individually under part number H4.5X31. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.