3MM CS X 91MM ID BLACK BUNA 70D

APG stocks the H3X91, a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 91 mm (3.583 in), a cross section of 3 mm (0.118 in), and an outside diameter of 97 mm (3.82 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The compound resists propane and butane, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or ketones are present.

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

H3X91 ships individually. Unit weight is approximately 2.56 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.