-439 BLACK BUNA 70D O-RING

H70439 is an AS568-439 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.

Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Expect good resistance to water, greases and lubricants, and hydraulic fluids. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or ketones.

Maintenance and OEM teams specify it across agricultural equipment, general industrial maintenance, and construction equipment.

This item is sold individually under part number H70439. Unit weight is approximately 25.31 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.