This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three plastic rollers or ball bearings that reduce the friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).

This ball caster is an improved version of our original Pololu Ball Caster with 1″ Plastic Ball; we recommend this new version over the older version for all applications that are not somehow specifically tied to the previous design.

This ball caster kit includes a two-part black ABS housing, a 1″ diameter POM (also know as acetal or by the brand name Delrin) plastic ball, and three ABS rollers/ (in ball bearing variable it is three 3×7×3mm ball bearings, and three dowel pins used to hold the ball bearings). When assembled, the ball caster is capable of rolling in any direction with low friction, making it suitable for use as a third contact point for wheeled, differential-drive robots weighing up to around ten pounds.

The base piece of the housing has holes for three #4 or M3 mounting screws (not included) and slots for the three rollers. The second part of the housing snaps into the base piece to secure the ball and rollers. The assembled ball caster has an overall height of 1.1″ (29 mm).

This ball caster is available with both variable i.e. ball bearings and plastic rollers.This ball caster available with ball bearings is for smoother performance.

Dimensions

Dimensions of the Pololu Ball Caster with 1″ Plastic Ball and Plastic Rollers/ Ball Bearings. Units are mm over [inches].

This dimension diagram is also available as a downloadable PDF (133k pdf).

Download pdf for Plastic Rollers variant

Download pdf for Ball Bearings variant  (134k pdf).

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″.

Dimensions