HSK tool holder is a double-sided clamping tool holder invented in Germany. It is also the most representative of double-sided clamping tool holders and has become one of the important links in high-speed cutting processing. Regarding its structure, type, and usage points, we can learn about it through the following answers:
Q1 What is the taper of HSK tool holder?
The tail connection of the HSK tool holder is shown in the figure. The hollow shank has a taper of 1:10, is light in weight and has a short stroke. The taper surface and end surface are in double-sided contact, and has high static and dynamic stiffness. The right is a common 7:24 taper shank.

Q2 What is the connection form of HSK tool holder?

During the positioning and clamping process, the positioning surface of the tool holder and the equipment spindle must fit very tightly without any gaps that affect accuracy. The high system rigidity and dynamic balance also prompt the clamping mechanism to tighten the tool holder, which requires an interference fit between the positioning surface of the tool holder and the equipment spindle.


Only interference fit can ensure that the clamping device is stable enough and will not cause the slightest change in the positioning surface due to interference from external forces. Sufficient tightening force must be maintained at all times during the clamping process.

Q3 What are the classifications of HSK tool holders?

The main types used in machining centers include type A, type B, type C, type D, type E, type F, and type T. Other types are still under development. Types A and C are suitable for medium torque and medium speed machine tools; types B and D are suitable for high torque and medium and high speed machine tools; types E and F are suitable for low torque and high speed machine tools.
DIN 69893 Type A
It has a V-shaped groove flange structure for automatic tool change. The flange also has an angular automatic recognition positioning groove and a reserved hole for chip installation. There are two grooves with different widths and depths on the rear cone. The first drive groove is uniquely positioned at a sharp angle, and is equipped with a process through hole for manual clamping and tool change. Internal cooling processing can be easily achieved by replacing the plug bolt in the center of the tool holder with a central cooling nozzle.

DIN 69893 Type C
The cylindrical flange structure is equipped with a process through hole for manual clamping and tool change, which is suitable for use on special machines. There are two driving grooves with different groove widths and depths on the rear end cone for unique angular positioning. Internal coolant machining is easily achieved by replacing the plug bolt in the center of the tool holder with a central cooling nozzle

DIN 69893 Type E
The complete full circumference flange structure with V-shaped slot for automatic tool change can not only meet the needs of automatic tool change, but also is mainly suitable for high-speed machining due to its very good structural symmetry, with internal cooling configuration