ER tool holder BT ER Collet Chuck,Er tool holder is a kind of numerical control tool holder, there are bt30, bt40, bt50, and there are many models, which are widely used. Used for boring, milling, drilling, tapping, grinding and carving. It is a common tool holder. Er shank tool holder and ER chuck, also known as spring chuck, Er nut, BT pull stud, Er elastic shank can be used to clamp milling cutters and taps. Er tool holder is a kind of accessory for edge-jointing tool machine tool, also known as Er tool holder, which is used to install on the spindle of drilling, tapping, milling machine or machining center. It is a kind of fixed locking device for fixing and reinforcing parts that need to be reconstructed and processed.

Specifications 

1.modle No.: BT30,BT40,BT50 
2.Materail: 20CrMnTi
3.Taper tolerance:<AT3
4.Carbon depth: 0.8mm±0.2mm
5.Surface Roughness: Ra<0.005mm
6. Hardness: HRC 56-58
7. Max run out: <0.005mm
8. Cooling AD+B type can be made by request
9. When Order, please specify balancing G6.3 or G2.5
10. Shank body standard: MAS 403 and B63396.