8.4MM CS X 189.1MM ID BLACK BUNA 70D

Ordered as H8.4X189.1, this is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 189.1 mm (7.445 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 205.9 mm (8.11 in). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to greases and lubricants, petroleum-based oils, and water. Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or ozone and direct sunlight.

Typical settings include fluid power, hydraulic and pneumatic systems, and agricultural equipment.

Stocked as H8.4X189.1 and sold individually. Unit weight is approximately 42.25 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.