5.7MM CS X 109.1MM ID BLACK BUNA 90D

APG stocks the H90M5.7X109.1, a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 109.1 mm (4.295 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 120.5 mm (4.74 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against petroleum-based oils, greases and lubricants, and hydraulic fluids. Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or automotive brake fluid call for a different compound.

Maintenance and OEM teams specify it across agricultural equipment, automotive, and hydraulic and pneumatic systems.

This item is sold individually under part number H90M5.7X109.1. 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.