4.5MM CS X 71MM ID BLACK BUNA 70D

APG stocks the H4.5X71, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 71 mm (2.795 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 80 mm (3.15 in). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

As a material, Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. The compound resists greases and lubricants, petroleum-based oils, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or strong acids.

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

Stocked as H4.5X71 and sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.