Ordered as H70039, this is an AS568-039 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 2.739 in (69.57 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 2.879 in (73.13 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.
Expect good resistance to greases and lubricants, propane and butane, and many alcohols. Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or polar solvents.
It sees regular use in general industrial maintenance, agricultural equipment, and hydraulic and pneumatic systems.
Stocked as H70039 and sold individually. Unit weight is approximately 0.6812 g. Review your operating media and conditions against this specification before 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 -039 BLACK BUNA 70D O-RING
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 2.739 inch (69.57 mm)
Actual Outside Diameter 2.879 inch (73.13 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity