Pulleys, High Speed Spindle, HiTorque Mini Mill 

Pulleys, High Speed Spindle, HiTorque Mini Mill
  • Fits HiTorque mini mills
  • 5000 rpm top speed
  • Includes two pulleys
Part Number: 4152
Weight: 0.38 lb

Price: $59.95

In stock
These pulleys change the spindle speed range to 5000 rpm max.

The increased speed is great for small cutters such as those used for engraving. Just remember that doubling the speed will cut the torque in half.

This high speed spindle kit uses the same belt as the standard drive pulleys.

We do not have installation instructions completed yet, so you are on your own for installation.

Switching pulleys to the original set shouldn't take more than 20 minutes.

Chris Chris' Tips
If your machine is not a HiTorque mini mill you need to get the High Speed Spindle Kit that includes replacement bearings. The factory bearings are not rated for 5000 RPM.

The HiTorque Mini Mills have genuine NSK bearings that are rated for well over 5000 RPM.


This product works with the following mills. (If your machine is not on this list, we cannot verify compatibility.)

  • 3900 HiTorque Mini Mill
  •   SIEG SX2L Mini Mill
  • 3960 HiTorque Mini Mill
  • 3990 HiTorque Mini Mill
  • 4190 HiTorque Mini Mill
  • 6450 HiTorque Mini Mill
  •   SIEG SX2LF Mini Mill