HS-645MG High Torque, Metal Gear Premium Sport Servo

Part No: 32645S

Product Description

The powerful HS-645MG is one of Hitec’s most popular servos. It’s the perfect choice for those larger sport planes or monster trucks and buggies requiring a durable high torque servo. Featuring our unique M/P and metal gear train technology, the HS-645MG offers one of the strongest gear trains available in any servo.


  • Top Selling High Torque Metal Gear Servo
  • Strong Three-Pole Ferrite Motor
  • Heavy Duty Metal Gear Train Featuring our Revolutionary Metal/Plastic First Gear (MP Gear)
  • Dual Ball Bearing-Supported Output Shaft

Related Products (Right Column)

Programmer (if applicable), Gears Set, 1st Gear set (if applicable), Case Set, Applicable horns and mounting hardware.

Downloads (Button Below Charts)

2D Drawings, output shaft 2D drawing, available horns 2D drawings

Programmable Functions

List of programmable features and interface type

HS-645MG Servo Specifications

Performance Specifications Min. Max. Unit
Operating Voltage Range 4.8 6 V
Speed 0.24 0.20 Sec @ 60º
Maximum Torque 107 133 oz / in
7.7 9.6 kg / cm
Current Draw at Idle -- 9.1 mAh
No Load Operating Current Draw -- 450 mAh
Stall Current -- 2500 mAh


Physical Specifications   Unit
Dimensions (W x D x H) 1.59 0.77 1.48 in
40.6 19.8


Weight 1.94 g
55.2 oz
Motor Type 3 Pole Metal Brush Ferrite --
Gear Material Metal --
Bearing Type Dual Ball Bearing --
Output Shaft STD 24 --
Dust Resistance IP 63 --
Water Resistance N / A --
Control Wire Gauge / Strand Count 22 / 60 AWG