3MM CS X 125MM ID BLACK BUNA 70D

APG stocks the H3X125, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 125 mm (4.921 in), a cross section of 3 mm (0.118 in), and an outside diameter of 131 mm (5.16 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Buna-N (Nitrile) is specified here for low compression set under sustained load and most widely specified general-purpose sealing elastomer. This material stands up to petroleum-based oils, greases and lubricants, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving polar solvents or automotive brake fluid call for a different compound.

It sees regular use in fluid power, hydraulic and pneumatic systems, and general industrial maintenance.

Order part number H3X125, sold individually. Unit weight is approximately 3.5 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.