5.7MM CS X 55.6MM ID BLACK BUNA 70D

H5.7X55.6 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 55.6 mm (2.189 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 67 mm (2.64 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope. Source specification: Metric O-RING, JIS P56.

The compound resists hydraulic fluids, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

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

H5.7X55.6 ships individually. Unit weight is approximately 5.9641 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.