High performance brushless servo motor using neodymium (NdFeB) magnets Dual shaft to allow the motor to drive a gearhead and an encoder stock no. 420-4975 has a pinion fitted to the front shaft, enabling the motor to be used with a 42mm gearhead Encoder can be fitted to the shaft using mounting kit stock no. 420-5120 Suitable controller Maxon DEC50-5 (stock no. 418-4045) Speed Constant: 250rpm/V (stock nos. 420-4969 and 420-4975)