5MM CS X 129MM ID BLACK BUNA 70D

H5X129 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 129 mm (5.079 in), a cross section of 5 mm (0.197 in), and an outside diameter of 139 mm (5.47 in). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.

Buna-N (Nitrile) is known for low compression set under sustained load and an economical choice for high-volume maintenance programs. It resists greases and lubricants, hydraulic fluids, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound.

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

Stocked as H5X129 and sold individually. Unit weight is approximately 10.757 g. Check the compound against your process media, pressure and temperature before committing to a design.