2.5MM CS X 51MM ID BLACK BUNA 70D

This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 51 mm (2.008 in), a cross section of 2.5 mm (0.098 in), and an outside diameter of 56 mm (2.2 in), catalogued under part number H2.5X51. It compresses into its gland to block fluid or gas migration across a joint.

It resists water, greases and lubricants, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or automotive brake fluid will shorten service life.

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

Order part number H2.5X51, sold individually. Unit weight is approximately 1.024 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.