5.3MM CS X 375MM ID BLACK BUNA 70D

APG stocks the H5.3X375, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 375 mm (14.764 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 385.6 mm (15.18 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

It resists greases and lubricants, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers 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). It is not the right choice where ketones or automotive brake fluid are present.

Typical settings include automotive, general industrial maintenance, and hydraulic and pneumatic systems.

Stocked as H5.3X375 and sold individually. Unit weight is approximately 32.664 g. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.