3MM CS X 19.5MM ID BLACK BUNA 70D

Ordered as H3X19.5, this is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 19.5 mm (0.768 in), a cross section of 3 mm (0.118 in), and an outside diameter of 25.5 mm (1 in). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The compound resists petroleum-based oils, water, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to automotive brake fluid or strong acids will shorten service life.

You will find this material specified across fluid power, automotive, and hydraulic and pneumatic systems.

H3X19.5 ships individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.