5.7MM CS X 53MM ID BLACK BUNA 70D

H5.7X53 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 53 mm (2.087 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 64.4 mm (2.54 in). In service, this o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

This material stands up to many alcohols, propane and butane, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or automotive brake fluid.

Maintenance and OEM teams specify it across construction equipment, fluid power, and agricultural equipment.

Reference part number H5.7X53 when ordering; the item is sold individually. Unit weight is approximately 5.7942 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.