This small, light ball caster uses a 3/8" diameter plastic 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.
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 with rollers | 1.10" | 0.48" | 0.58 oz |
