1.5MM CS X 18MM ID BLACK BUNA 70D

Ordered as H1.5X18, this is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 18 mm (0.709 in), a cross section of 1.5 mm (0.059 in), and an outside diameter of 21 mm (0.83 in). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The compound resists petroleum-based oils, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving polar solvents or automotive brake fluid call for a different compound.

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

Order part number H1.5X18, sold individually. Unit weight is approximately 0.134 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.