Buna 70-164-Black-Pk25

The SB-H70164-25 is an AS568-164 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 6.237 in (158.42 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 6.443 in (163.65 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. Supplementary detail from the product record: 6.4375IDX6.25"ODX.0938"CS.

The compound resists propane and butane, petroleum-based oils, and hydraulic fluids. Buna-N (Nitrile) is widely chosen for low compression set under sustained load and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to strong acids or ozone and direct sunlight will shorten service life.

Maintenance and OEM teams specify it across general industrial maintenance, automotive, and hydraulic and pneumatic systems.

Reference part number SB-H70164-25 when ordering; the item is sold by the bag. Nominal inside diameter is listed as 6 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.