Spektrum SPMS651 Standard 7kg 7.2V Metal Geared Waterproof Servo
Spektrum SPMS651 Standard 7kg 7.2V Metal Geared Waterproof Servo
 Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience 'brown-outs' where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver smoothing the current delivery. However, in some cases, you may need to install an external BEC.
Spektrum S651 7kg Servo with 15% more torque than the previous ADS-7M servo for enhanced steering.
SpecificationsGear Material: Brass
Speed: 0.143 @ 6V - 0.122 @ 7.2V
Torque: 6.37 @ 6V, 7.42kg @ 7.2V
Voltage: 6V/7.2V
Waterproof: Yes
Spline Count: 23T
In this video, Hamish gives a step-by-step guide on installing a Servo and how to avoid stripping your servo gears.

Spektrum S651 Servo Dimensions
Total Height (A) = 43mm
Body Width (B) = 40.5mm
Below Mount (C) = 25mm
Above Mount (D) = 18mm
Total Length (E) = 54mm
Total Width (F) = 20mm
Included items
| Description | QTY |
|---|---|
| Standard SPMS651 7kg 7.2V Steel/Brass Geared Servo | 1 |
-
Input Voltage Range
- 6VV
-
Total Width
- 20mm
-
Servo Spline Count
- 23Tooth
-
Top to Under Mount
- 18mm
-
Total Length
- 54mm
-
Body Length
- 40.5mm
-
Bottom to Under Mount
- 25mm
-
6V Sec/60 DegreesSeconds per 60 degrees of rotation
- 0.143
-
Total Height
- 43mm
-
Case Material
- Plastic
-
Rotational Degrees
- 120° (Normal)
-
Signal Type
- Digital
-
6V Torque kg/cmKilograms of torque at 25mm away from the center of the spline
- 7
-
Gear Material
- Steel & Brass
-
Waterproof Casing
- Yes
-
SizeConventionally sized servo names
- Standard













