The general standards for the accuracy of ER collets are as follows:
Level 1: Accuracy: 0.01mm. The ER collet made of bearing steel has high elasticity and service life. All ER elastic collets are precision ground and manufactured in accordance with the German DIN6499 precision specification. ER has a stretchable elastic space of 1mm.
Level 2: Accuracy: 0.01--0.015mm. ER elastic collets made of bearing steel have high elasticity and service life. All ER elastic collets are precision ground and manufactured in accordance with German DIN6499 precision specifications. ER has a stretchable elastic space of 1mm. The ER collet uses the elastic deformation of a spring collet in the middle to clamp the tool. The clamping is relatively simple and convenient, and the precision of the tool handle is not high.
