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 |