1.78MM CS X 145.29MM ID BLACK BUNA 70D

Part number H1.78X145.29 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 145.29 mm (5.72 in), a cross section of 1.78 mm (0.07 in), and an outside diameter of 148.85 mm (5.86 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Expect good resistance to propane and butane, hydraulic fluids, and greases and lubricants. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or polar solvents call for a different compound.

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

Stocked as H1.78X145.29 and sold individually. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.