ER Nuts UM Type Product Features 
1. The ER nuts are made from fine 20CrMnTi with treatment to HRC48-52.
2. The ER nuts thread and 60°cone are processed one time to ensure coaxially, the thread tolerance is 4H.
3. Peach-heart circle ensures the balanced distribution of overall weight along the circumference and avoids mechanical vibration.
4. High-quality black oxide ensures an attractive appearance, high corrosion resistance, and durability.
5. According to the requirements of clients, the dynamic balance levels are G2.5*18000rpm, G2.5*2000rpm, G2.5*25000, G6.3*12000rpm, G6.3*18000rpm
6. Other types of nuts will be custom processed according to the drawing.

Technology: High-quality chrome-molybdenum steel is adopted. Finish machining thread, cone, and surface bluing treatment should be achieved after rough machining and overall quenching. 

Feature: Nut is characterized by long process flow. Finish machining thread after overall quenching makes the critical dimensions more accurate and thread grade reaching grade 4H. Surface bluing treatment, the appearance includes all black and white teeth, which is popular in Europe and America. 




Insertion Procedure
1. Insert the collet at an angle, fitting the two extractor teeth which protrude A (figure 1) into the collet's groove (figure 2).
2. Place the two parts on a clean and horizontal work surface, press down with your thumb on the back end of the collet until it clicks into place (figure 3).

Extraction Procedure