"HSK" is the German abbreviation for "hollow taper shank. HSK shanks must be connected to machines via compatible HSK spindle receivers. Whereas steep-taper shanks were developed prior to standardization, HSK shanks were developed to address performance problems associated with the traditional interfaces, particularly in high speed machining applications.

The shank styles are designated by the letters A through F identified by the diameter of the shank's flange in millimeters. Styles A, B, C, and D are for low-speed applications. E and F are for high speeds. The main differences between the styles are the positions of the drive slots, gripper-location slots, coolant holes, and the area of the flange. Each style was defined for certain applications. It is critical that the proper type of HSK tooling be specified on high-speed machine tools, not just the correct size.

These holders are dynamically balanced, to give good results in machining. For high speed machining and to provide good rigidity to the tools, we offer integral reamers with HSK 50, HSK 63, HSK 80 and HSK 100 series shanks. These can be directly clamped on to spindle and there is no separate setting time is needed.

These are supplied with high accuracy, to help our customers to achieve highest dimensional accuracy in their components, even if the machine spindle is having a run out,

The compensation holders also supplied by KJK to hold the flange reamers. The BT and BBT with KAH 63 and KAH 81 (KAH are KJK adjustable holders), HSK A50 and HSK A63 with KAH63 and KAH81 holders are supplied based on the applications.