Controlled toolholder thread runout for more-accurate alignment with the collet nut. Full lot traceability of all toolholders for maximum reliability and process control. Tighter thread tolerances for reduced friction with greater holding torque and lower TIR. All toolholders 100% precision balanced for use at the highest rpm ratings.

Hi-Q / ERC clamping nuts for coolant through tools. Designed for application with DS/ER and KS/ER.

When it comes to nuts, there are choices aside from the standard ER nut—our ERN is interchangeable with any other holder brand, but accuracy cannot be guaranteed. Let’s look at the other options.

We've got both ER collet nuts and ER Mini Nuts in your choice of standard and high-speed coated versions. Available in sizes ER 8 thru ER 40. Coated nuts give up to 100% more clamping pressure over bearing nuts. For use when speeds exceed 15,000 rpm. Recommended torque is 80 to 90% of max value.

We offer a wide selection of ER clamping nuts for virtually any application. Our innovative collet-locking system retains the collet safely in the nut and makes assembling and disassembling really easy. Our innovative and high-quality clamping nuts fit your machining needs.

Chiloskit ER16 A Type ER Collet Clamping Nuts for Milling Chuck Holder Lathe CNC (ER16A(M19x1))

Simply replace your existing ER collet nut with an easyZERO runout compensation nut. The easyZERO nut features six adjustment screws that allow for up to 0.002” (0.050mm) runout to be dialed out in seconds.

Grab ahold of your runout problems with the easyZERO NUT: An easy-to-use replacement nut designed to quickly correct runout errors and misalignment for all round tools using ER collets - sizes ER16 to ER40. Simply replace your existing ER collet nut with an easyZERO runout compensation nut!

The MEGA ER Nut features built-in thrust ball bearings for high accuracy and clamping force. This ER collet nut is ideal for solid carbide drills and reamers. They have a slot-free outer diameter, which increases the rigidity of the ER nut itself.