Parts/Radio & control/Servos/Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z
Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z
Hitec

Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

Part # HRC32645S3.6(19)
Where to buy
$43.99
AMain Hobbies
Seen Oct 11, 2026
$43.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

This is the HS-645MG Metal-Geared, Coreless, Ball Bearing, Hi-Torque Servo from Hitec. This version of the servo has a universal connector which will fit Airtronics, JR, Hitec and Futaba receivers (be careful with the polarity of the connector for Futaba radios).

Specifications:
  • Speed:
    • 4.8V: 0.24 sec/60 deg.
    • 6.0V: 0.2 sec/60 deg.
  • Torque:
    • 4.8V: 107 oz/in
    • 6.0V: 133 oz/in
  • Length: 1.5in (38mm)
  • Width: 0.79in (20mm)
  • Height: 1.61in (41mm)
  • Weight: 1.95oz (55.2g)
Limited Warranty:
Hitec Servo Warranty: Each Hitec servo is backed by a limited two-year warranty from the date of purchase. Hitec RCD USA, INC. shall REPAIR OR REPLACE, at Hitec RCD, INC., defective equipment covered by this warranty, otherwise the purchaser and/or consumer is responsible for any charges for the repair or replacement of the product.

Reviews3.6 · 19 reviews

Matthew Zornon Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

I've has these servos for quite a while. This is a high torque servo, and a slower servo as described in the numbers in the specs. So why is there a bunch of complaining with these servos???? If you don't understand the numbers in the specs, then get off your ass and call Amain for help!!!!!

4 found this helpful
Anonymouson Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

Theres nothing wrong with this servo, or at least nothing wrong with the one i have. it has a VERY slight centering problem, and i cant tell when im driving. it is very quiet too. i like it.

3 found this helpful
Anonymouson Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

Excellant value! Torquey and reasonably quick. Cant beat it for the money.

2 found this helpful
Anonymouson Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

I have this servo in my traxxas sport maxx which i bought a few years ago. i bought it when the traxxas one went bad which wasn't very long and it has worked great for me. no complaints at all.

1 found this helpful
SHANE FOOTEon Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

Decent Servo for the money. Hitec has great customer support.

1 found this helpful
What reviewers say

Reviewers are divided. Several owners in budget RC builds, including Tamiya trucks and buggies, report reliable service, solid torque and good value for the price. Others describe the servo as slow, prone to centering problems, or failing early, with some saying it broke within a day or a few heat cycles. Speed is the most frequently criticised trait, and some reviewers note it is not suited to high-speed or racing use. One reviewer reports the servo worked at 5V but glitched at 6V. A verified owner found stock Tamiya servo savers incompatible. Several comments compare it unfavourably with Futaba or JR alternatives, while others say it is adequate for backyard use.

  • + Good torque for the price
  • + Affordable value
  • + Quiet operation
  • + Works well in budget builds
  • − Slow speed
  • − Reliability and early failures reported
  • − Centering problems reported
  • − Glitching at 6V in one report
Summary generated from the reviews above.

Builds using this part3