The H3X57.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 57.5 mm (2.264 in), a cross section of 3 mm (0.118 in), and an outside diameter of 63.5 mm (2.5 in). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.
The material holds up against hydraulic fluids, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for low compression set under sustained load, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where strong acids or ozone and direct sunlight are present.
Typical settings include construction equipment, automotive, and general industrial maintenance.
Order part number H3X57.5, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 3MM CS X 57.5MM ID BLACK BUNA 70D
Actual Outside Diameter 63.5 mm (2.5 inch)
Actual Cross Section 3 mm (0.118 inch)
Actual Inside Diameter 57.5 mm (2.264 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity