3.53MM CS X 49.21MM ID BLACK BUNA 70D

H3.53X49.21 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 49.21 mm (1.937 in), a cross section of 3.53 mm (0.139 in), and an outside diameter of 56.27 mm (2.22 in). In service, this o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

This material stands up to propane and butane, hydraulic fluids, and greases and lubricants. Buna-N (Nitrile) offers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 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 construction equipment, fluid power, and general industrial maintenance.

This item is sold individually under part number H3.53X49.21. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.