4.5MM CS X 66MM ID BLACK BUNA 70D

The H4.5X66 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 66 mm (2.598 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 75 mm (2.95 in). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against water, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for strong abrasion and tear resistance, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

It sees regular use in general industrial maintenance, construction equipment, and agricultural equipment.

Reference part number H4.5X66 when ordering; the item is sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.