8.4MM CS X 249.5MM ID BLACK BUNA 70D

APG stocks the H8.4X249.5, a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 249.5 mm (9.823 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 266.3 mm (10.48 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. Source specification: Metric O-RING, JIS P250.

This material stands up to petroleum-based oils, propane and butane, and greases and lubricants. Buna-N (Nitrile) is valued for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to polar solvents or strong acids will shorten service life.

Maintenance and OEM teams specify it across general industrial maintenance, fluid power, and construction equipment.

Order part number H8.4X249.5, sold individually. Unit weight is approximately 55.44 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.