This o-ring is supplied in AS568-037 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 2.489 in (63.22 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 2.629 in (66.78 mm), catalogued under part number H70037. It compresses into its gland to block fluid or gas migration across a joint.
The compound resists propane and butane, greases and lubricants, and many alcohols. Buna-N (Nitrile) is widely chosen for low compression set under sustained load, reliable performance in both static and dynamic service. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound.
It sees regular use in general industrial maintenance, construction equipment, and hydraulic and pneumatic systems.
This item is sold individually under part number H70037. Unit weight is approximately 0.643 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description -037 BLACK BUNA 70D O-RING
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 2.489 inch (63.22 mm)
Actual Outside Diameter 2.629 inch (66.78 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity