H5.7X39.2 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 39.2 mm (1.543 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 50.6 mm (1.99 in). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.
As a material, Buna-N (Nitrile) is specified for low compression set under sustained load and an economical choice for high-volume maintenance programs. The material holds up against hydraulic fluids, petroleum-based oils, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or automotive brake fluid are present.
You will find this material specified across construction equipment, agricultural equipment, and hydraulic and pneumatic systems.
Order part number H5.7X39.2, sold individually. Check the compound against your process media, pressure and temperature before committing to a design.
Description 5.7MM CS X 39.2MM ID BLACK BUNA 70D
Actual Outside Diameter 50.6 mm (1.99 inch)
Actual Cross Section 5.7 mm (0.224 inch)
Actual Inside Diameter 39.2 mm (1.543 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity