Tool Encyclopedia

HSK Tool Holders Gallery

Fig.1-9. HSK is a toolholding system that is a rigid, lightweight, and capable of high radial and axial accuracy. In addition, the system is suitable for very-high-speed rotary applications .HSK tooling - is the only technology currently available that is designed to perform at tomorrow's spindle speeds.


1 HSK is a taper standard designed for High Speed machining that provides high rigidity and high stability while high speed machining. Properly specified and applied, HSK tooling can optimize time in the cut for all machine tools, while it ensures consistent radial and axial accuracy. It is lighter, shorter, stiffer, and more precise than any competitive quick-change tooling technology, and it is the only technology currently available that is designed to perform at tomorrow's spindle speeds. With these advantages going for it, the HSK revolution is ready to begin.

2 HSK spindles clamp tools with greater and more consistent force than most standard-taper spindles do. CAT and BT spindles generally depend on a pack of belleville spring washers for axial retention forces. (NMTB spindles use a mechanical drawbar and an internal shank thread.) At high spindle speeds, a spring-activated retention assembly doesn't offer much security.

3 An HSK spindle's hydraulic retention assembly provides higher, longer lasting clamping force than a spring-activated assembly does. The retention claws of an HSK spindle apply consistent radial and axial clamping forces to the holder. Because the positive locking action is enhanced by centrifugal force, the retention claws hold the toolholder more securely at higher speeds.

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