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
The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for continuous rotation. At 6 V, it has a maximum rotation speed of 54 RPM (no-load) and can produce up to 71 oz-in (5.1 kg-cm) of torque. It features two ball bearings on the output shaft for reduced friction, and it offers easy access to the rest-point adjustment potentiometer. The servo can be controlled using a direct connection to a single microcontroller I/O line without any additional electronics, which makes it a great actuator for beginner robotics projects.
The SM-S4303R continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. The default rest point is 1.5 ms, but this can be adjusted by using a small slotted screwdriver to turn the middle-point positioner. Pulse widths above the rest point result in counterclockwise rotation, with speed increasing as the pulse width increases; pulse widths below the rest point result in clockwise rotation, with speed increasing as the pulse width decreases.
The servo has an 11" (270 mm) lead that is terminated with a JR-style connector and includes additional servo horns and mounting hardware. The following picture shows an example of the hardware that might be included (actual hardware could vary):
This robotics servo is compatible with our servo controllers and has a Futaba-compatible output shaft, which means it works with our servo wheels and sprockets.
Note: Our Futaba servo wheels are a very tight fit with this servo’s output shaft (tighter than our other continuous rotation servos). They do work together, but typically you must push hard to get them on.
Continuous rotation servo comparison
|SpringRC SM-S4303R (left), Power HD AR-3606HB (middle), and Parallax (right) continuous rotation servos.|
||Parallax (Futaba S148)
|Max Speed @ 6 V:
|Stall torque @ 6 V:
|Max Speed @ 4.8 V:
|Stall torque@ 4.8 V:
People often buy this product together with: