ER collet is one kind of the Spring Collet and it is usually to be used with Nc shank. As a speciallized manufacturer of ER collets, QuFu ChongDe Precision Machinery Co.,Ltd has many years mature experience on how to make ER collets.We choose the high grade spring steel-65 Mn as the material,so we can ensure the quality. The product hardness is HRC44-48 and the precision is 5ν and 8ν, With unique process such as ER8,ER11,ER16,ER20,ER25,ER32,ER40,ER50 etc. The clamp force of our ER collet is big, the clamp arrangement is wide and the clamp precision is accurately, so they can be used on the process of boring, milling, drilling, tapping, grinding and carving etc. “Customer First, Quality Crucial” and try the best to provide the best products to the customers all over the world