CM-785HB Servo Gearbox

Product Code:
CM-785HB-5-U
£117.06 £97.55

The CM-785HB Servo Gearbox utilizes the Hitec HS-785HB sail winch servo (included) to create a high-torque Servo Gearbox.

  • Ratio: 5:1
  • Assembled : No
CM-785HB Servo Gearbox CM-785HB Servo Gearbox CM-785HB Servo Gearbox
CM-785HB Servo Gearbox

The stock Hitec servo can rotate several turns in factory form (approximately 4 turns on most Tx/Rx systems; up to 8 turns with a 650-2350usec signal). When the servo is installed into the gearbox, the total amount of rotation is decreased by the ratio selected but the torque and precision is increased by the ratio. The lower the gear ratio, the more precision and torque it will provide but the speed and amount of rotation will be decreased.  

By incorporating threaded side mounts you can now easily attach these servo gearboxes to numerous ServoCity products including tubing and channel; making it easier than ever to incorporate a servo gearbox into a custom pan & tilt, mechanical device, or robotic structure.

Five different gear ratios are available in order to find the right balance between torque and rotation. Positioning feedback remains since the servo is completely stock and unmodified in any way. The CM-785HB can handle tremendous side loads with the dual ABEC-5 precision ball bearings which support the hardened 1/2” stainless steel hollow shaft.

The shaft is hollow with a .382” inner diameter to allow wires from cameras, sensors or other devices to not tangle during multi-turn movements.

The brass pinion gear meshes to a high-grade 7075 aluminium 32 pitch hub gear which is fastened to the output shaft of the gearbox with a 1/2” clamping hub. The .770” clamping hub has 6-32 tapped holes which allow easy attachment of various components. Patented

Output Shaft Diameter 0.500"
Servo included Yes
Voltage Range (Recommended) 4.8V-6.0V
Max PWM Signal Range (Standard) 600-2400 μsec
Travel per 1µs Signal Change (Standard Rotation) 1.57°
Max Travel (Standard Rotation) 2826°
Direction w/ Increasing PWM Signal Counter Clockwise
Internal Feedback Style 5KΩ Potentiometer
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