Pololu Ball Casters

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

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	Pololu item #: 949 Price: $24.95 Quantity:
Pololu Ball Caster Variety Pack Order the Pololu ball caster variety pack and save! The variety pack consists of all seven Pololu ball casters. The replacement 3pi ball caster is not included with this variety pack.

	Pololu item #: 950 Price: $2.99 Quantity:
Pololu Ball Caster with 3/8" Plastic Ball 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".

	Pololu item #: 951 Price: $2.99 Quantity:
Pololu Ball Caster with 3/8" Metal Ball This small ball caster uses a 3/8" diameter metal ball. The height of the assembled kit ranges from 0.4" to 0.6".

	Pololu item #: 952 Price: $3.99 Quantity:
Pololu Ball Caster with 1/2" Plastic Ball This light ball caster uses a 1/2" diameter plastic ball. The height of the assembled kit ranges from 0.5" to 0.8".

	Pololu item #: 953 Price: $3.99 Quantity:
Pololu Ball Caster with 1/2" Metal Ball This ball caster uses a 1/2" diameter metal ball. The height of the assembled kit ranges from 0.5" to 0.8".

	Pololu item #: 954 Price: $5.99 Quantity:
Pololu Ball Caster with 3/4" Plastic Ball 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.

	Pololu item #: 955 Price: $4.99 Quantity:
Pololu Ball Caster with 3/4" Metal Ball This light ball caster uses a 3/4" diameter metal ball. The height of the assembled kit ranges from 0.8" to 1.1".

	Pololu item #: 956 Price: $6.99 Quantity:
Pololu Ball Caster with 1" Plastic Ball 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.

	Pololu item #: 957 Price: $2.75 Quantity:
Replacement 3pi Ball Caster with 1/2" Plastic Ball This ball caster can be used as a replacement 3pi robot part or 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.