1.9MM CS X 4.2MM ID BLACK BUNA 70D

H1.9X4.2 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 4.2 mm (0.165 in), a cross section of 1.9 mm (0.075 in), and an outside diameter of 8 mm (0.31 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists greases and lubricants, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or automotive brake fluid are present.

Common environments for this compound include construction equipment, agricultural equipment, and automotive.

H1.9X4.2 ships individually. Unit weight is approximately 0.0792 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.