3MM CS X 143MM ID BLACK BUNA 70D

The H3X143 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 143 mm (5.63 in), a cross section of 3 mm (0.118 in), and an outside diameter of 149 mm (5.87 in). This o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

As a material, Buna-N (Nitrile) offers strong abrasion and tear resistance, low compression set under sustained load. The material holds up against propane and butane, water, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across construction equipment, fluid power, and agricultural equipment.

Order part number H3X143, sold individually. Unit weight is approximately 4.05 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.