Buna 70-328-Black-Pk50

SB-H70328-50 is an AS568-328 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 1.85 in (46.99 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.27 in (57.66 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint. The catalog record notes: 2.25IDX1.875"ODX.1875"CS.

Buna-N (Nitrile) is valued for low compression set under sustained load, strong abrasion and tear resistance. Expect good resistance to greases and lubricants, propane and butane, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving automotive brake fluid or ketones call for a different compound.

It sees regular use in construction equipment, automotive, and fluid power.

Reference part number SB-H70328-50 when ordering; the item is sold by the bag. Check the compound against your process media, pressure and temperature before committing to a design.