3MM CS X 25.5MM ID BLACK BUNA 70D

Part number H3X25.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 25.5 mm (1.004 in), a cross section of 3 mm (0.118 in), and an outside diameter of 31.5 mm (1.24 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The material holds up against petroleum-based oils, many alcohols, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers reliable performance in both static and dynamic service, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in polar solvents or ozone and direct sunlight.

Common environments for this compound include fluid power, construction equipment, and general industrial maintenance.

Stocked as H3X25.5 and sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. 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.