JINING QINFENG MACHINERY HARDWARE CO.,LTD

JINING QINFENG MACHINERY HARDWARE CO.,LTD

What are the differences in the contact surfaces between BT and BBT chucks?

2025 09/04

The BBT collet chuck features a dual-contact design, where both the end face and the taper of the BT Collet Chuck make contact with the spindle. This dual-contact design primarily enhances the rigidity, stability, and precision of the Tool Holder.
 
Bt Er Collet Chuck
toolholdertool holder

Based on mechanical theory, the larger the diameter of the reference point, the stronger the rigidity. The common system is the standard diameter of the taper shank end; the reference BBT diameter is the flange diameter, which significantly enhances the rigidity.
 
Bt Tool Holder
Improve the stability of the tool holder during high-speed machining;
S reduces the phenomenon of poor quality caused by the tool rack during high-speed cutting;
A larger contact diameter helps increase the number of extensions;
The improved tool stability can extend tool life, ensure repeatable positioning accuracy after tool changes, and enhance drilling roundness during hole cutting