8-144 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-144 black Buna-N (Nitrile) 90 Shore A supplied with an inside diameter of 2.487 in (63.17 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.693 in (68.4 mm), catalogued under part number HB90144. It allows a standard o-ring to operate at higher pressures than it could unsupported.

The compound resists propane and butane, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life.

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

HB90144 ships individually. Unit weight is approximately 0.727 g. Review your operating media and conditions against this specification before installation.