3.1MM CS X 139.4MM ID BLACK BUNA 90D

This o-ring is supplied in black Buna-N (Nitrile) 90 Shore A built to an inside diameter of 139.4 mm (5.488 in), a cross section of 3.1 mm (0.122 in), and an outside diameter of 145.6 mm (5.73 in), catalogued under part number H90M3.1X139.4. It delivers dependable bidirectional sealing in a compact groove envelope. Additional detail on this item: Metric O-RING, JIS G140.

It resists water, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where strong acids or ozone and direct sunlight are present.

It sees regular use in hydraulic and pneumatic systems, construction equipment, and fluid power.

H90M3.1X139.4 ships individually. Unit weight is approximately 4.6758 g. 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.