Pololu Ball Caster Kit with 3/4" Plastic Ball

With a 3/4" (19mm) plastic ball this ball caster kit comes complete with mounting screws and spacers to change the final height of the caster. Dowel pins are included to reduce friction between the ball and ABS housing. The caster provides a good 'third point' for a differential drive robot.

AUD$ 7.95

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Our Code: MEC-30008

Supplier Link: [Pololu MPN:954]


A ball caster is a great way to provide stability to a small robot with a differential drive. The ball does not have any directional bias that would cause the robot to go in unexpected directions unlike a traditional pivoting wheel caster which are better suited to bigger heavier robots (and shopping trolleys).

The kit comes with:

  • Strong black ABS plastic housing
  • 3/4" (19mm) plastic ball
  • 3 dowel pin rollers
  • 2 spacers with thicknesses of 1/16" and 1/8",  (1.6mm and 3.2mm)
  • 2 nuts and bolts to mount the caster to a chassis


The total height of the caster is 0.91" (23.1mm) with no spacers. Spacers can then be added to increase the height to a total of 27.9mm.


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