The H90M3X64.5 is a black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 64.5 mm (2.539 in), a cross section of 3 mm (0.118 in), and an outside diameter of 70.5 mm (2.78 in). This o-ring compresses into its gland to block fluid or gas migration across a joint.
Expect good resistance to greases and lubricants, hydraulic fluids, and petroleum-based oils. Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or strong acids.
You will find this material specified across agricultural equipment, fluid power, and construction equipment.
This item is sold individually under part number H90M3X64.5. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description 3MM CS X 64.5MM ID BLACK BUNA 90D
Actual Outside Diameter 70.5 mm (2.78 inch)
Actual Cross Section 3 mm (0.118 inch)
Actual Inside Diameter 64.5 mm (2.539 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity