3MM CS X 280MM ID BLACK BUNA 70D

H3X280 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 280 mm (11.024 in), a cross section of 3 mm (0.118 in), and an outside diameter of 286 mm (11.26 in). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to water, hydraulic fluids, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs and low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or ketones are present.

Maintenance and OEM teams specify it across automotive, fluid power, and hydraulic and pneumatic systems.

Reference part number H3X280 when ordering; the item is sold individually. Unit weight is approximately 7.675 g. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.