Description: This ball caster kit from Pololu 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 this ball caster is 0.4" with no spacers. You can also adjust the height by adding the spacers.
The ball caster can be mounted to a chassis by the two screw sets included in the kit. The distance between the two screw holes is 0.53".
Based on 1 ratings:
A recent hackathon had us using a servo to twist a plate with a load on top and we wanted to take the weight off the servo. These proved to be perfect. They don’t spin freely, but have a bit of resistance to them. That said, they are definitely better than just trying to rub two smooth surfaces together.