4.5MM CS X 51MM ID BLACK BUNA 70D

H4.5X51 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 51 mm (2.008 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 60 mm (2.36 in). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

As a material, Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. It resists water, hydraulic fluids, and greases and lubricants. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ozone and direct sunlight are present.

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

Order part number H4.5X51, sold individually. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.