3MM CS X 30.5MM ID BLACK BUNA 70D

H3X30.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 30.5 mm (1.201 in), a cross section of 3 mm (0.118 in), and an outside diameter of 36.5 mm (1.44 in). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to greases and lubricants, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or polar solvents.

Maintenance and OEM teams specify it across automotive, construction equipment, and fluid power.

H3X30.5 ships individually. Check the compound against your process media, pressure and temperature before committing to a design.