What is the difference between the 2.2 Nm and 3.0 Nm versions?

They use the same 2HSS57-C driver and cable set; the motor differs. The 2.2 Nm 57HS20N-GX16-4 is the compact choice for general CNC axes. The 3.0 Nm motor gives more torque for axes that push harder, such as a heavier gantry or a lead-screw Z axis.

What comes in the box?

One closed-loop stepper motor in the chosen torque rating, one 2HSS57-C hybrid step-servo driver, one 5 m GX16-4 motor power cable and one 5 m DB9 encoder cable.

Will it work with my existing controller?

The 2HSS57-C takes standard step and direction signals, so most CNC controllers and breakout boards can drive it. Check that your controller's signal voltage and pulse timing match the driver's input spec before ordering.

Why choose closed-loop over a plain stepper?

The encoder lets the driver detect and correct position error, so the motor is far less likely to lose steps when a cut loads the axis. You get more usable torque and fewer ruined parts than an open-loop stepper of similar size.

Is this a good fit for a small hobby router?

Yes, if the axis can take a 57-frame motor. The 2.2 Nm version is the usual pick for hobby and benchtop routers; the 3.0 Nm version is better for larger or heavier machines.

Can I buy a replacement later if one fails?

It is a clearance item and may not be restocked, so plan on sourcing a replacement driver or motor separately if something fails. The kit is final sale unless defective.