4MM CS X 91MM ID BLACK BUNA 70D

Ordered as H4X91, this is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 91 mm (3.583 in), a cross section of 4 mm (0.157 in), and an outside diameter of 99 mm (3.9 in). The o-ring compresses into its gland to block fluid or gas migration across a joint.

Expect good resistance to water, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where polar solvents or strong acids are present.

Common environments for this compound include fluid power, construction equipment, and hydraulic and pneumatic systems.

H4X91 ships individually. Unit weight is approximately 4.6458 g. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.