5.7MM CS X 99.2MM ID BLACK BUNA 90D

APG stocks the H90M5.7X99.2, a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 99.2 mm (3.906 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 110.6 mm (4.35 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

It resists propane and butane, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, 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). It should not be specified for service in ozone and direct sunlight or ketones.

Typical settings include general industrial maintenance, automotive, and agricultural equipment.

Stocked as H90M5.7X99.2 and sold individually. 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.