5.3MM CS X 212MM ID BLACK BUNA 70D

The H5.3X212 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 212 mm (8.346 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 222.6 mm (8.76 in). This o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The material holds up against water, hydraulic fluids, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is known for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Typical settings include general industrial maintenance, fluid power, and automotive.

Stocked as H5.3X212 and sold individually. Unit weight is approximately 18.425 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.