3MM CS X 40MM ID BLACK BUNA 90D

APG stocks the H90M3X40, a black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 40 mm (1.575 in), a cross section of 3 mm (0.118 in), and an outside diameter of 46 mm (1.81 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The compound resists many alcohols, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to ozone and direct sunlight or automotive brake fluid will shorten service life.

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

Order part number H90M3X40, sold individually. Unit weight is approximately 1.264 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.