Introduction to Basic Knowledge of_BT Type CNC Tool Handle

July 29, 2019

BT CNC tool holder is mainly a Japanese standard, and it is also a commonly used standard. The universal tool handle with taper of 7:24 has five standards and specifications, namely NT (traditional type), DIN69871 (German standard), IS07388/1 (international standard), MASBT (Japanese standard) and ANSI/ASME (American standard).

The German standard of NT type tool holder is DIN2080, which is to tighten the tool holder by pulling rod on traditional machine tools, also known as ST in China; the other four kinds of tool holders are tightened by pulling nails at the end of the tool holder on the processing center. MASBT (BT) BT is a Japanese standard. Its installation size is totally different from DIN69871, IS07388/1 and ANSI. It can not be replaced.

The symmetrical structure of BT type tool holder makes it better than the other three kinds of tool holders in high speed stability. Titanium Hao is selected as the tool shank. The tool shank has 30, 35, 40, 45, 50 and 60 gauges, which indicate the diameter of the taper shank somewhere (the specific position is different in different standards). Cone specifications are usually chosen by machine tool manufacturers according to the effective power of the machine tool or the total length of the tool used. They are also related to the country of manufacture (DIN standard in Europe, ANSI standard in America and JIS standard in Japan). The commonly used specifications of tool shank are 30, 40, 50, of which 40 is the most widely used.

bt tool holder