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
Pololu ball caster ball diameter |
height with no spacers |
distance between screw holes |
weight with no spacers or screws |
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0.40" |
0.53" |
0.03 oz |
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0.40" |
0.53" |
0.14 oz |
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0.53" |
0.58" |
0.07 oz |
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0.53" |
0.58" |
0.32 oz |
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0.91" |
0.24" |
0.25 oz |
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0.83" |
0.61" |
1.05 oz |
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1.10" |
0.70" |
0.36 oz |
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Order the Pololu ball caster variety pack and save! The variety pack consists of all seven Pololu ball casters.
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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".
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This small ball caster uses a 3/8" diameter metal ball. The height of the assembled kit ranges from 0.4" to 0.6".
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This light ball caster uses a 1/2" diameter plastic ball. The height of the assembled kit ranges from 0.5" to 0.8".
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This ball caster uses a 1/2" diameter metal ball. The height of the assembled kit ranges from 0.5" to 0.8".
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This light ball caster uses a 3/4" diameter plastic ball. The height of the assembled kit ranges from 0.9" to 1.2". Dowel pins are used to minimize the friction between the ball and the ABS housing.
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This light ball caster uses a 3/4" diameter metal ball. The height of the assembled kit ranges from 0.8" to 1.1".
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This light ball caster uses a 1" diameter plastic ball. The height of the assembled kit ranges from 1.1" to 1.4". Dowel pins are used to minimize the friction between the ball and the ABS housing.
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