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 plastic 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||1.10″||0.70″||0.36 oz|