Servo - Full Rotation (SM-S4303R)

Model No: ROB-00029

TK. 1015.54

Availability: In stock


Category: Motor

Supplier: Made in China

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.

Question & Answer

Total 3 questions

Q: Will this be available any time soon ?? Questioned by Hasib_Rahman, 02-Apr-2014

Yes. Soon. If you are interested, please click on the Notify me W/A icon. Answered by A.R, 03-Apr-2014 04:04 AM

We are selling this one now. Answered by A.R, 22-Apr-2014 10:24 AM

Q: এইটা কবে আবার আসবে, যতবার আসি, ততবারই Out of Stock Questioned by protanvir, 20-Sep-2014

Q: can i rotate this servo at a certain angle like other servos? Questioned by rhpallock, 07-Nov-2018

No. Please see the description, specs and documents for clarification. Answered by A.R, 08-Nov-2018 03:29 AM

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