5.7MM CS X 445MM ID BLACK BUNA 70D

The H5.7X445 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 445 mm (17.52 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 456.4 mm (17.97 in). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists water, greases and lubricants, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or automotive brake fluid.

Common environments for this compound include agricultural equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Reference part number H5.7X445 when ordering; the item is sold individually. 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.