BT40 Tool Holder accepts all ER11 collets
The thread inside internal stop screw
Made from alloy steel hardened to 54 – 56rc
Balanced to G6.3 at 12,000 rpms
Concentricity is less than .005 microns
All critical tool holder surfaces precision ground
Coolant through capability
The gage length is 70mm
The rear thread for the pull stud is M16 X 2.0
All holders have the capability to become through coolant by simply removing the screw in the center with allen key
