- BT TAPER is the most commont type of standard.
- Bt tool holders use metrical screw thread pull stud.
- Bt stands for "bottle grip taper"and is marked by a tapered shank.It is used by attaching it to the spindle of the machine.
TYPES OF HOLDERS
- BT ENDMILL HOLDERS
- BT SHELL MILL HOLDERS
- BT MORSE TAPER ADAPTERS
- BT SIDE LOCK HOLDERS
- BT HYDROGRIP HOLDERS
| SIZE | D-1 | D-2 | D-3 | LGT | F | A | G |
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | |
| BT-30 | 31.75 | 46 | 32.6 | 48.4 | 22 | 2 | M12 |
| BT-40 | 44.45 | 63 | 43.2 | 65.4 | 27 | 2 | M16 |
| BT-50 | 69.85 | 100 | 70.8 | 101.8 | 38 | 3 | M24 |