5.7MM CS X 89.6MM ID BLACK BUNA 90D

Part number H90M5.7X89.6 is a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 89.6 mm (3.528 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 101 mm (3.98 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. The catalog record notes: Metric O-RING, JIS P90.

As a material, Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Expect good resistance to greases and lubricants, hydraulic fluids, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound.

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

Reference part number H90M5.7X89.6 when ordering; the item is sold individually. Unit weight is approximately 10.591 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.