1.8MM CS X 4MM ID BLACK BUNA 70D

APG stocks the H1.8X4, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 4 mm (0.157 in), a cross section of 1.8 mm (0.071 in), and an outside diameter of 7.6 mm (0.3 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to hydraulic fluids, water, and propane and butane. Buna-N (Nitrile) is valued for strong abrasion and tear resistance, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or polar solvents.

Maintenance and OEM teams specify it across automotive, construction equipment, and fluid power.

H1.8X4 ships individually. Unit weight is approximately 0.057 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. 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.