Buna 70-118-Black-Pk100

SB-H70118-100 is an AS568-118 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 0.862 in (21.89 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.068 in (27.13 mm). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. Source specification: 1.0625IDX.875"ODX.0938"CS.

The compound resists many alcohols, greases and lubricants, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for low compression set under sustained load and an economical choice for high-volume maintenance programs. 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.

You will find this material specified across agricultural equipment, construction equipment, and fluid power.

Reference part number SB-H70118-100 when ordering; the item is sold by the bag. Nominal inside diameter is listed as 7/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.