HSK tool handle is the handle of high-speed cutting tool, which has become an important part of machining and manufacturing technology in high-speed cutting. After several revisions, the International Organization for Standardization issued the official ISO standard ISO12164 for HSK tool systems in 2001.

At present, the most widely used high-speed cutting tools are Germany's HSK (German Hohl Shaft Kegel abbreviation) tool system, the United States' KM tool system, Japan's NC5, BIG-PLUS tool system, etc. All of these belong to the two-sided restrained tool holder.

In high speed machining has become an important part of machining manufacturing technology. The machining performance of traditional BT tool system has been difficult to meet the requirements of high-speed cutting.

The tool system can be cut at high speed, and the following basic conditions should be met:

1. High system accuracy

The system accuracy includes the clamping accuracy of the system positioning and the repeated positioning accuracy of the tool. The former refers to the connection accuracy of the tool and the tool handle, and the tool handle and the machine tool spindle. The latter refers to the consistency of tool system accuracy after each tool change. The tool system has a high system accuracy, in order to ensure the static and dynamic stability of the tool system under high-speed machining conditions.

2. High system stiffness

The static and dynamic stiffness of tool system is an important factor affecting machining accuracy and cutting performance. Insufficient rigidity of the tool system can cause vibration of the tool system, which reduces the machining accuracy, intensifies the wear of the tool and reduces the service life of the tool.

3. Good dynamic balance

Under the conditions of high-speed cutting, the imbalance of small mass will cause huge centrifugal force, causing sharp vibration of the machine tool during the processing. Therefore, the dynamic balance of high-speed tool system is very important.

In July 1991, Germany published the draft DIN standard for HSK tool systems and recommended the development of relevant ISO standards to the International Organization for Standardization. In May 1992, the International Standardization Organization ISOT/TC29 (Tool Technical Committee) decided not to develop an ISO standard for automatic tool change hollow handles. After a second round of study by the Working group, the official industry standard DIN69893 for HSK tool systems was developed in Germany in 1993. In May 1996, at the ISO/TC29/WG33 review meeting, the draft ISO standard ISO/DIS12164 for HSK tool systems based on DIN69893 was developed. After several revisions, the official ISO standard ISO12164 for HSK tool systems was published in 2001.

Can withstand the maximum bending moment, torque and use of the highest speed. These performance data are related to the conditions of the application (such as clamping method and clamping force), as well as factors such as the material used to manufacture the handle and the heat treatment process. For example, the small size shank made of carburized steel has the possibility of quenching due to the very thin wall thickness in the taper shank part, which greatly reduces the ability of the shank to bear dynamic load. In order to avoid overload, in actual use, it is necessary to accurately understand the maximum carrying capacity of HSK shank for bending moment and torque and the highest speed used, both for the user and the manufacturer of the shank, so as to select the correct size and structure of the HSK shank for specific conditions of use, so as to achieve reasonable and safe use.Compared with BT(7/24) tool system, which is widely used at present, HSK tool system has not been developed to become an international standard for a long time, some theoretical problems have not been solved, some problems in use have not been fully exposed, and users have some one-sided or even wrong understanding of this new tool system.