5.3MM CS X 77.5MM ID BLACK BUNA 70D

Ordered as H5.3X77.5, this is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 77.5 mm (3.051 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 88.1 mm (3.47 in). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

As a material, Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Expect good resistance to petroleum-based oils, propane and butane, and greases and lubricants. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or polar solvents will shorten service life.

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

Order part number H5.3X77.5, sold individually. Unit weight is approximately 7.0912 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. 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.