Buna 70-206-Black-Pk100

APG stocks the SB-H70206-100, an AS568-206 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 0.484 in (12.29 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.762 in (19.35 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint. The catalog record notes:0.75IDX.5"ODX.125"CS.

The compound resists hydraulic fluids, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to automotive brake fluid or strong acids will shorten service life.

You will find this material specified across fluid power, general industrial maintenance, and construction equipment.

Stocked as SB-H70206-100 and sold by the bag. Nominal inside diameter is listed as 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.