BT40 JT6 holders are mainly used to hold JT6 Female Taper. This holder has JT6 Male taper, similar to drill chucks, which have an internal taper of JT6 so that it can carry it easily with rigidity.
Made from alloy steel hardened to 54 56rcBalanced to G6.3 at 12,000 rpmsConcentricity is less than .005 micron up to 100 Length and 0.012 up to 200 Length.All critical tool holder surfaces are precision-groundRear thread for pull stud is M16 X 2.0
