Pololu Ball Caster with 1/2 inch Metal Ball Pololu 953

PololuSKU: ACC056

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This ball caster uses a 1/2″ diameter metal ball. The height of the assembled kit ranges from 0.5″ to 0.8″, depending on the combination of included spacers used.


Pololu ball caster with 1/2" metal ball with included hardware.


This ball caster kit includes a black ABS housing, a 1/2″ diameter metal ball, two spacers (1/16″ and 1/8″ thick), and two 7/16″ #2 screws and nuts. The total height of the ball caster, 0.53″, can be increased to about 0.7″ using the included spacers. The two included #2 screws can be used to mount the ball caster to your chassis, or you can use your own #2 or M2 screws if your application requires a different length.

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 generally keep it from rolling well.

For detailed dimensions, see the dimension diagram (162k pdf).

Comparison of Pololu ball casters


Pololu ball casters with plastic and metal balls. Ball diameter from left to right: 1″, 3/4″, 1/2″, and 3/8″.


Pololu ball caster
ball diameter
height with
no spacers
screw holes
weight with
no spacers
or screws
3/8″ plastic ball
0.40″ 0.53″ 0.03 oz
3/8″ metal ball
0.40″ 0.53″ 0.14 oz
1/2″ plastic ball
0.53″ 0.58″ 0.07 oz
1/2″ metal ball
0.53″ 0.58″ 0.32 oz
3/4″ plastic ball
0.88″ 0.24″ 0.25 oz
3/4″ metal ball
0.82″ 0.61″ 1.05 oz
1″ plastic ball, ball bearings
1.10″ 0.48″ 0.65 oz
1″ plastic ball, plastic rollers
1.10″ 0.48″ 0.58 oz
1″ plastic ball (old version)
1.10″ 0.70″ 0.36 oz


Parameter Value
Ball diameter 0.5 in
Weight 9 g
Ball material metal


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