ER collet wrench, commonly used to tighten and loosen ER collet nuts in CNC machining, milling and other precision tooling applications.

The ER wrench is designed to fit specific ER collet sizes (such as ER8, ER11, ER16, ER20, ER25) and provides the leverage needed to secure the collet nut onto the chuck or tool holder.

To use it correctly, it is important to ensure that the machine is turned off and the spindle is stopped. To loosen the ER collet nut, simply insert the head of the wrench into the teeth of the nut and turn counterclockwise until it comes loose, allowing the collet to be removed with the tool mounted. Once the new collet is inserted into the nut, it must be placed in the machine spindle and tightened by turning clockwise with the wrench until everything is firmly locked, being careful not to overtighten to avoid damage. ER wrenches are available in different sizes, such as ER8, ER11, ER16, ER20, ER25, and it is essential to use the correct model to ensure effective and safe tightening.