Ordered as H90M3.53X55.56, this is a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 55.56 mm (2.187 in), a cross section of 3.53 mm (0.139 in), and an outside diameter of 62.62 mm (2.47 in). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
As a material, Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Expect good resistance to water, greases and lubricants, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or ketones are present.
It sees regular use in construction equipment, hydraulic and pneumatic systems, and fluid power.
Order part number H90M3.53X55.56, sold individually. 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.
Description 3.53MM CS X 55.56MM ID BLACK BUNA 90D
Actual Outside Diameter 62.62 mm (2.47 inch)
Actual Cross Section 3.53 mm (0.139 inch)
Actual Inside Diameter 55.56 mm (2.187 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity