APG stocks the H70143, an AS568-143 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 2.425 in (61.6 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.631 in (66.83 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.
As a material, Buna-N (Nitrile) is valued for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Expect good resistance to many alcohols, water, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving ozone and direct sunlight or ketones call for a different compound.
It sees regular use in construction equipment, fluid power, and automotive.
Stocked as H70143 and sold individually. Unit weight is approximately 1.36 g and nominal inside diameter is listed as 2 7/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.
Description -143 BLACK BUNA 70D O-RING
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.425 inch (61.6 mm)
Actual Outside Diameter 2.631 inch (66.83 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity