3MM CS X 15MM ID BLACK BUNA 70D

Ordered as H3X15, this is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 15 mm (0.591 in), a cross section of 3 mm (0.118 in), and an outside diameter of 21 mm (0.83 in). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against greases and lubricants, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers 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). Applications involving strong acids or polar solvents call for a different compound.

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

H3X15 ships individually. Unit weight is approximately 0.5073 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.