We've moved, all orders pick-up will now be at 550 Alden Road, Unit 104.
As a precaution to COVID-19, in-store purchase is NOT available but you may place your order online then pickup your order.
Shipping of online order is unaffected. Delivery may be delayed due to carrier backlog. Sorry for the inconvenience.

This light ball caster uses a 3/4" diameter metal ball. The height of the assembled kit ranges from 0.9" to 1.2". Dowel pins are used to minimize the friction between the ball and the ABS housing.

This ball caster kit includes a black ABS housing, a 3/4" diameter metal 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.

Ball Caster Comparison Table

Pololu ball caster ball diameter height with no spacers distance between 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 0.91" 0.24" 0.25 oz
3/4" metal-ball 0.83" 0.61" 1.05 oz
1" plastic-ball 1.10" 0.70" 0.36 oz

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