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HS-645MG Servo

  • HS-645MG in box
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  • HS-645MG with quarter for scale
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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 their unique M/P and metal gear train technology, the HS-645MG offers one of the strongest gear trains available in any servo.

Dimensions 1.59" x 0.77"x 1.48" (40.6 x 19.8 x 37.8mm)
Product Weight 1.94oz. (55.2g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.24sec/60°
No-Load Speed (6.0V) 0.20sec/60°
Stall Torque (4.8V) 106.93 oz/in. (
Stall Torque (6.0V) 133.31 oz/in. (
Max PWM Signal Range (Standard) 553-2520μsec
Travel per µs (out of box) .100°/μsec
Max Travel (out of box) 197°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8.8mA
Current Drain - idle (6.0V) 9.1mA
Current Drain - no-load (4.8V) 350mA
Current Drain - no-load (6V) 450mA
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite
Potentiometer Drive Indirect Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearings
Gear Type Straight Cut Spur
Gear Material 3 Metal Gears and 1 Resin Metal Gear
Wire Length 11.81" (300mm)
Wire Gauge 22AWG

This servo can rotate up to 197° when given a PWM signal ranging from 553 to 2520 microseconds. Since most R/C controllers cannot generate this wide of a signal range, you can purchase our servo stretcher for extended rotation operation.

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