5.7MM CS X 64.2MM ID BLACK BUNA 70D

Part number H5.7X64.2 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 64.2 mm (2.528 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 75.6 mm (2.98 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

This material stands up to petroleum-based oils, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or strong acids.

Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number H5.7X64.2 when ordering; the item is sold individually. Unit weight is approximately 6.9215 g. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.