4MM CS X 90MM ID BLACK BUNA 90D

Ordered as H90M4X90, this is a black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 90 mm (3.543 in), a cross section of 4 mm (0.157 in), and an outside diameter of 98 mm (3.86 in). The o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists greases and lubricants, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or polar solvents will shorten service life.

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

Order part number H90M4X90, sold individually. Unit weight is approximately 4.83 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.