Servo - Full Rotation

Model : ROB-00029

Supplier : Made in China

TechshopBD, Bangladesh


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It is a simple, high quality continuous full-rotation servo motor.

The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for continuous rotation (up to 70 RPM at 6 V), and it is the strongest continuous rotation servo we carry (4.8 kg-cm/67 oz-in at 6 V). 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. Note that this is the reverse of what is described in the datasheet.



  • Continuous 360° rotation
  • Rest point adjustment
  • Operating voltage: 4.8-6.0VDC
  • Top operating speed: 60-70RPM (4.8-6.0VDC respectively)
  • Torque: 3.3-4.8 kg-cm (4.8-6.0VDC respectively)
  • 4 plastic gears + 1 metal gear
  • Double ball bearing



39.5 x 20.5 x 42 mm


44 g

General specifications

Speed @ 6V:

0.14 sec/60°(1)

Stall torque @ 6V:

66.7 oz·in

Speed @ 4.8V:

0.16 sec/60°(2)

Stall torque @ 4.8V:

45.8 oz·in

Lead length:

11 in



(1) About 70 RPM.

(2) About 60 RPM.

Login to post comments.
Hasib_Rahman | Apr 2,2014 at 01:56 PM
Will this be available any time soon ??
A.R | Apr 3,2014 at 10:04 AM
Yes. Soon. If you are interested, please click on the Notify me W/A icon.
A.R | Apr 22,2014 at 04:24 PM
We are selling this one now.
Protanvir | Sep 20,2014 at 12:09 PM
এইটা কবে আবার আসবে, যতবার আসি, ততবারই Out of Stock
Rhpallock | Nov 7,2018 at 03:06 PM
can i rotate this servo at a certain angle like other servos?
A.R | Nov 8,2018 at 09:29 AM
No. Please see the description, specs and documents for clarification.

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