1.78MM CS X 3.17MM ID BLACK BUNA 90D

APG stocks the H90M1.78X3.17, a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 3.17 mm (0.125 in), a cross section of 1.78 mm (0.07 in), and an outside diameter of 6.73 mm (0.26 in). An 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, an economical choice for high-volume maintenance programs. The material holds up against many alcohols, greases and lubricants, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

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

H90M1.78X3.17 ships individually. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.