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″.

Our ball casters (often called ball transfers when used with the ball facing up) are great third contact points for small differential-drive robots. These units have larger ball diameter-to-weight ratios than industrial units, giving your robot the ability to drive over larger obstacles without adding too much weight.

These ball casters are intended for robots weighing up to a few pounds. The larger ball casters are not made for more weight but rather to allow greater obstacle clearance.

Comparison of Pololu ball casters

Alternatives available with variations in these parameter(s): ball diameter ball material Select variant…

Pololu ball caster
ball diameter
height with
no spacers
distance
between
screw holes
weight with
no spacers
or screws
0.40″ 0.53″ 0.03 oz
0.40″ 0.53″ 0.14 oz
0.53″ 0.58″ 0.07 oz
0.53″ 0.58″ 0.32 oz
0.88″ 0.24″ 0.25 oz
0.82″ 0.61″ 1.05 oz
1.10″ 0.48″ 0.65 oz
1.10″ 0.48″ 0.58 oz
1.10″ 0.70″ 0.36 oz

Products in category “Pololu Ball Casters”

Pololu item #: 950
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

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″, depending on the combination of included spacers used.

Pololu item #: 951
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This small ball caster uses a 3/8″ diameter metal ball. The height of the assembled kit ranges from 0.4″ to 0.6″, depending on the combination of included spacers used.

Pololu item #: 952
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This light ball caster uses a 1/2″ diameter plastic ball. The height of the assembled kit ranges from 0.5″ to 0.8″, depending on the combination of included spacers used.

Pololu item #: 953
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This ball caster uses a 1/2″ diameter metal ball. The height of the assembled kit ranges from 0.5″ to 0.8″, depending on the combination of included spacers used.

Pololu item #: 954
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This light ball caster uses a 3/4″ diameter plastic ball. The height of the assembled kit ranges from 0.9″ to 1.2″, depending on the combination of included spacers used. Included dowel pins can be used to reduce the friction between the ball and the ABS housing, but they are not necessary for operation.

Pololu item #: 955
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

This ball caster uses a 3/4″ diameter metal ball. The height of the assembled kit ranges from 0.8″ to 1.1″, depending on the combination of included spacers used.

Pololu item #: 2692
Brand: Pololu supply outlook
Status: Active and Preferred 
Out of stock.
Quantity:

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 ball bearings that minimize friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).

Pololu item #: 2691
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant
Out of stock.
Quantity:

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 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).

Pololu item #: 956
Brand: Pololu supply outlook
Status: Active 
RoHS 3 compliant
Out of stock.
Quantity:

This light ball caster uses a 1″ diameter plastic ball. The height of the assembled kit ranges from 1.1″ to 1.4″, depending on the combination of included spacers used. Included dowel pins can be used to reduce the friction between the ball and the ABS housing, but they are not necessary for operation.

Pololu item #: 957
Brand: Pololu supply outlook
Status: Active 
RoHS 3 compliant
Out of stock.
Quantity:

This ball caster was originally released as a replacement part for the 3pi robot, but the 1/2″ ball can also be used a replacement part for the newer 3pi+ robot, which has the housing for the ball built directly into the chassis. This ball caster can also be used as a general-purpose ball caster: when mounted through a hole in a chassis that uses our micro metal gearmotors and our 32×7mm wheels, as on the 3pi, this ball caster is just the right height to keep the chassis level.

Related Products

Tamiya 70144 Ball Caster Kit (2 casters)

Related Categories

Ball Casters
Wheels, Tracks, and Ball Casters
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