Continuous Rotation Servos

Continuous rotation servos are standard hobby RC servos that have been modified to offer open-loop speed control instead of their usual closed-loop position control. The modification effectively turns them into motors with integrated motor drivers in a compact, inexpensive package. Just throw on a wheel and you have a drive system for your robot that can be controlled using an RC signal or a simple direct connection to a single microcontroller I/O line. The following table shows how our continuous rotation servos compare to each other.

Continuous rotation servo size comparison. From left to right: SpringRC SM-S4303R, Power HD AR-3606HB, FEETECH FS5106R, Parallax Feedback 360°, Parallax (Futaba S148), and FEETECH FS90R.

6 V 4.8 V Weight (g) Size (mm) Digital? Feed­back? Price
Max speed
(RPM)
Stall torque
(oz·in)
Max speed
(RPM)
Stall torque
(oz·in)
SpringRC SM-S4303R 54 71 43 46 41  41.3 × 20.7 × 40.2  $12.95
PowerHD AR-3606HB 71 93 62 83 40  40.5 × 20.0 × 38.0  $14.95
FEETECH FS5106R 95 83 78 70 39  40.8 × 20.1 × 38.0  $13.95
Parallax Feedback 360° 140 35 41  40.0 × 20.0 × 37.2  yes yes $27.99
FEETECH FT90R 170 21 135 18 9  22.9 × 12.1 × 26.5  yes $7.95
FEETECH FS90R 130 21 100 18 9  23.2 × 12.5 × 22.0  $4.95

Products in category “Continuous Rotation Servos”

Pololu item #: 2149
Brand: Power HD
Temporarily out of stock. See product page to backorder.
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The AR-3606HB is a standard-sized servo that has been built by Power HD specifically for continuous rotation, making it an easy way to get your robot moving. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. This is the strongest continuous rotation servo we carry.

Key specs at 6 V: 71 RPM (no-load), 93 oz-in (6.7 kg-cm), 40 g

Pololu item #: 1248
Brand: SpringRC
Temporarily out of stock. See product page to backorder.
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The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for continuous rotation, making it an easy way to get your robot moving. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. This is the most popular continuous rotation servo we carry.

Key specs at 6 V: 54 RPM (no-load), 71 oz-in (5.1 kg-cm), 41 g

Pololu item #: 3430
Brand: FEETECH
Temporarily out of stock. See product page to backorder.
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The FS5106R is a standard-sized servo that has been built by FEETECH specifically for continuous rotation, making it an easy way to get your robot moving. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. This servo can work with both 5 V and 3.3 V servo signals.

Key specs at 6 V: 95 RPM (no-load), 83 oz-in (6 kg-cm), 40 g

Pololu item #: 536
Brand: Parallax
Status: Clearance 
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We recommend the SM-S430R, AR-3606HB, and FS5106R continuous rotation servos as alternatives with superior performance and nearly identical sizes to the Futaba S148.

The Parallax continuous rotation servo is a Futaba S148 servo that has been modified for continuous rotation. Since servos have their own integrated control circuitry, this unit gives you an easy way to get your robot moving.

Key specs at 6 V: 50 RPM (no-load), 38 oz-in (2.7 kg-cm), 43 g

Pololu item #: 3432
Brand: Parallax
Temporarily out of stock. See product page to backorder.
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The Parallax Feedback 360° provides the functionality of a light-duty standard servo, a continuous rotation servo, a high-speed servo, and encoder feedback in one convenient package. Its speed is controlled with standard RC servo pulses, just like a typical continuous rotation servo, and it provides a return signal line from an internal Hall effect sensor that provides digital angular position feedback. An external microcontroller can use this signal to make the servo hold any angle, much like a standard servo except without any limits on the range of motion, or it can use it for closed-loop speed control. Recommended operating voltage range is 5.8 V to 8.4 V

Key specs at 6 V: 140 RPM (no-load), 35 oz-in (2.5 kg-cm), 41 g

Pololu item #: 2820
Brand: FEETECH
Temporarily out of stock. See product page to backorder.
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The FS90R is a micro servo that has been built by FEETECH specifically for continuous rotation, offering an inexpensive and easy way to get your small turret spinning or miniature robot moving, especially when paired with our 60×8mm wheels designed specifically for this servo. This servo can work with both 5 V and 3.3 V servo signals.

Key specs at 6 V: 130 RPM (no-load), 21 oz-in (1.5 kg-cm), 9 g

Pololu item #: 2817
Brand: FEETECH
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

The FT90R is a digital micro servo that has been built by FEETECH specifically for continuous rotation, offering an inexpensive and easy way to get your small turret spinning or miniature robot moving, especially when paired with our 60×8mm wheels designed specifically for this servo. This servo can work with both 5 V and 3.3 V servo signals.

Key specs at 6 V: 170 RPM (no-load), 21 oz-in (1.5 kg-cm), 9 g

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RC Servos
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