5.3MM CS X 40MM ID BLACK BUNA 70D

APG stocks the H5.3X40, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 40 mm (1.575 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 50.6 mm (1.99 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Buna-N (Nitrile) is known for low compression set under sustained load, strong abrasion and tear resistance. The material holds up against many alcohols, greases and lubricants, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving strong acids or ozone and direct sunlight call for a different compound.

It sees regular use in agricultural equipment, automotive, and general industrial maintenance.

Order part number H5.3X40, sold individually. Unit weight is approximately 3.9028 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.