Buna 70-340-Black-Pk25

The SB-H70340-25 is an AS568-340 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 3.35 in (85.09 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.77 in (95.76 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint. The catalog record notes: 3.75IDX3.375"ODX.1875"CS.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The compound resists propane and butane, water, and greases and lubricants. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or polar solvents will shorten service life.

Common environments for this compound include agricultural equipment, general industrial maintenance, and construction equipment.

Order part number SB-H70340-25, sold by the bag. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.