Note: We have released an improved ball caster with 1″ plastic ball that we recommend over this older version for applications that are not somehow specifically tied to this item #956 design. The new version is available with better plastic rollers or with ball bearings and it holds the ball more securely.

Pololu 1" ball caster (old version) with included hardware.

Overview

This ball caster kit includes a black ABS housing, a 1″ diameter plastic ball, three dowel pin rollers, two spacers (1/16″ and 1/8″ thick), and mounting hardware. The total height of the ball caster, 1.1″, can be increased to about 1.3″ using the included spacers. The mounting hardware consists three 7/16″ #2 screws and three 1″ #2 screws (and three nuts) so you can pick the most appropriate length for your particular application. You can also use your own #2 or M2 screws if your application requires some other length.

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 generally 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″.

People often buy this product together with:

Pololu Ball Caster with 3/4″ Metal Ball

Pololu Ball Caster with 3/8″ Metal Ball

Pololu Micro Metal Gearmotor Bracket Extended Pair