4MM CS X 180MM ID BLACK BUNA 90D

H90M4X180 is a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 180 mm (7.087 in), a cross section of 4 mm (0.157 in), and an outside diameter of 188 mm (7.4 in). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Buna-N (Nitrile) is specified here for low compression set under sustained load and economical choice for high-volume maintenance programs. It resists propane and butane, water, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or polar solvents are present.

Typical settings include construction equipment, automotive, and fluid power.

Stocked as H90M4X180 and sold individually. Unit weight is approximately 9.38 g. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.