4MM CS X 120MM ID BLACK BUNA 90D

Part number H90M4X120 is a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 120 mm (4.724 in), a cross section of 4 mm (0.157 in), and an outside diameter of 128 mm (5.04 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists water, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Typical settings include general industrial maintenance, hydraulic and pneumatic systems, and fluid power.

This item is sold individually under part number H90M4X120. Unit weight is approximately 6.8599 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.