This ball caster kit includes a black ABS housing, a 3/4″ diameter plastic ball, three dowel pin rollers, two spacers (1/16″ and 1/8″ thick), and two #2 screw sets. The total height of the ball caster, 0.91″, can be increased to about 1.1″ using the included spacers. The two included #2 screws can be used to mount the ball caster to your chassis (the distance between the screw holes is 0.24″).

Note that our ball casters are designed for small robots; they are not intended to bear more than a few pounds. With more weight than this, friction between the ball and the housing will probably keep it from rolling well.

Pololu ball caster
ball diameter
height with
no spacers
screw holes
weight with
no spacers
or screws
0.40″ 0.53″ 0.03 oz
0.40″ 0.53″ 0.14 oz
0.53″ 0.58″ 0.07 oz
0.53″ 0.58″ 0.32 oz
3/4″ plastic ball
0.91″ 0.24″ 0.25 oz
0.83″ 0.61″ 1.05 oz
1.10″ 0.48″ 0.65 oz
1.10″ 0.48″ 0.58 oz
1.10″ 0.70″ 0.36 oz



Ball diameter: 0.75 in
Weight: 7 g1

General specifications

Ball material: plastic


Without screws or spacers.


SKU PL-954
Brand Pololu

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