5.7MM CS X 129.1MM ID BLACK BUNA 90D

H90M5.7X129.1 is a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 129.1 mm (5.083 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 140.5 mm (5.53 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

This material stands up to petroleum-based oils, greases and lubricants, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or ozone and direct sunlight call for a different compound.

Typical settings include general industrial maintenance, agricultural equipment, and automotive.

Reference part number H90M5.7X129.1 when ordering; the item is sold individually. 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.