The HS-645MG has been tried and tested in many robot kits, and is the servo of choice for our MSR-H01 hexapod kit. For the price, this is a hard servo to beat when it comes to power and quality, however, these servos are slow. This isn't an issue within most robotics uses, as the slower output tends to give better resolution and less cogging.
Torque 4.8V/6.0V – 7.7 / 9.6 kg
Speed 4.8V/6.0V – 0.24 / 0.20 sec
Dimensions – 40.60 x 19.80 x 37.30mm
Weight – 55.2g
Dual Ball Bearing, Metal Gears
Good metal gearbox