Hitec 32645S HS-645MG High Torque 2BB Metal Gear Servo

These are my favorite servos for what and how I fly. My only complaint is they took so long to arrive from when I ordered them. And to top it off, Hitec has a promo, buy 3 get 1 free.

This is highest torque analog servo in Hitec product line. I bought this one for 30$, and digital servo for 70$ to compare them for robotic arm application. This one is nearly silent, and has a very strong torque, nearly as much as 70$ digital one. I would even say, that I really like the way this servo sounds while working. Digital servo for 70$ has very loud, high-pitch sound, which is very unpleasant to everybody around, and people asked me many times to switch off the robotic arm, as they did not want to hear this sound. So I am now using only HS-645MG in all robotic arms. Strong work horse servo, reliable metal gears. Highly recommend this product to anyone, good job, Hitec guys! And if you can, please silence you digital servos, because acoustics is the reason we cannot use them often :)

Perfect fit ! Would buy again.

I use this servo to control the arms of an animatronic skeleton I set up every Halloween. I use to two of them at each shoulder joint, one to move the arm mechanism (which contains a lighter servo at the forearm joint ) frontward and backwards and the other to raise the arm upwards and downwards. While the resulting effect is very lifelike, it exposes the shoulder servos to quite a bit of stress, given they are in essence connected to the end of a relatively large "boom" consisting of the arms, especially when they are engaged in rapid movements. I initially found that the latter caused the round plastic servo horns these come with to crack, so I replaced those with round diecast metal ones that are attached to the arm connections by tightly fastened hex bolts. The only improvement I wish hitec could make to these servos would be to redesign the servo hub to accept a beefier screw to secure the horn.. The ones it currently employs are thin 2.6mm ones, which are much too light given the stresses this servo is exposed to in robotic/animatronic applications.

The product operates correctly so far after giving it a test on September 14, 2025.

As described

I could have bought 2 or three servos for the price I paid for this one, but man am I glad I didn't. This is the strongest servo I've ever bought. I built a mechanical arm and used two of these and two cheaper servos, let me tell you there is no comparison.

I received exactly what was ordered. No issues.

Over the last two decades I have used hundreds of servos for dozens of builds. Radio controlled devices, stage props, special fx devices and arduino projects. The Hitec brand servos are without a doubt the most reliable with the most consistant quality servos I have ever used.

habe ich als starken Lenkservo für einen LRP Scout Crawler eingebaut. Sehr wichtig . kauft auf jedenfall einen Aluhebel für den Servo und nehmt bei einem Crawler nicht die Plastikhebel. Der Servo hat 24 Zähne (wichtig als Angabe für den Aluhebel). Funktioniert bestens mit einem BEC Spannungsregler.

These are a great strong servo. Have used them for years in helicopters, jets and prop planes. Excellent Hitec quality!

My favourite servo if I want to save a few bucks. Speed is fine and the torque is great.

Does the job. Quality product, well built, solid. I use it in a trail vehicule and it works very well.