3MM CS X 142MM ID BLACK BUNA 70D

H3X142 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 142 mm (5.591 in), a cross section of 3 mm (0.118 in), and an outside diameter of 148 mm (5.83 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The material holds up against many alcohols, propane and butane, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life.

Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and agricultural equipment.

H3X142 ships individually. 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.