Pololu Ball Caster with 3/8″ Metal Ball

Product Code: Pololu #951

Pololu Ball Caster with 3/8″ Metal Ball
Pololu Ball Caster with 3/8″ Metal Ball
Pololu Ball Caster with 3/8″ Metal Ball
Pololu Ball Caster with 3/8″ Metal Ball

GST inclusive


Availability: 2 In Stock

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This small ball caster uses a 3/8″ diameter metal ball. The height of the assembled kit ranges from 0.4″ to 0.6″.

This ball caster kit includes a black ABS housing, a 3/8″ diameter metal ball, two spacers (1/16″ and 1/8″ thick), and two #2 screw sets. The total height of the ball caster, 0.4″, can be increased to about 0.6″ 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 0.53″).

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.

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

0.91″ 0.24″ 0.25 oz

3/4″ metal ball

0.83″ 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
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