2MM CS X 4.5MM ID BLACK BUNA 70D

This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 4.5 mm (0.177 in), a cross section of 2 mm (0.079 in), and an outside diameter of 8.5 mm (0.33 in), catalogued under part number H2X4.5. It compresses into its gland to block fluid or gas migration across a joint.

As a material, Buna-N (Nitrile) is widely chosen for low compression set under sustained load, reliable performance in both static and dynamic service. It resists many alcohols, hydraulic fluids, and greases and lubricants. 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 strong acids or automotive brake fluid are present.

Maintenance and OEM teams specify it across agricultural equipment, fluid power, and hydraulic and pneumatic systems.

This item is sold individually under part number H2X4.5. Unit weight is approximately 0.0811 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.