Integral Spring-Less, Self-Locking Tool Clamping System for Hollow-Taper-Shank Tools (HSK, DIN 69893)

What do you need for a simple, safe and consistent Hollow-Taper-Shank tool  clamping (HSK)?

Nothing more than this …


SLH-x  –  the spring-less simplicity

Tool spindle manufacturers know of all of the problems that come with a spring-based taper clamping system – a complex and stacked design combined with inconsistent balancing and shaft dynamics, spring-fatigue, inconsistent clamping positions and pull-in forces at excessive servicing.

Existing self-locking clamping systems on the other hand appear to be too complex and show quite different problems. Due to the serial combination of several taper connections these clamping systems have not only to cover a broad travel range, but also suffer from changes in clamping position and pull-force due to non-predictable changes in tribological conditions. Self-locking taper clamping system that comply with the current state of the art also use a self-locking unit connected to a standard clamping unit which can be used with other clamping systems. This again affects the already large change in clamping position.

Our new developed and patent pending spring-less automatic clamping system for Hollow-Taper-Shank (HSK) tools with optional aerostatic rotary feedtrough is based on the principle of a monolithic pre-loaded self-locking. For this the clamping and the locking unit used with other spring-less clamping systems are combined and reduced to only one single unit of a very simplistic design that covers the clamping as well as the self-locking.

The results for the spindle manufacturer:

  • Number of parts involved reduced to the minimum
  • Ultra compact, simple and light design
  • clamping system removable (service) from shaft without removing the shaft from the spindle
  • Non-rotating drawbar (standard)
  • Forces to eject a tool reduced by 60 % (to preserve the spindle bearings)
  • Optional aerostatic rotary feedthrough (not available for SLH-25)


The benefits for your machining application:

  • Consistent clamping force and positions even over 2 million tool change cycles
  • Consistent and excellent shaft balancing and dynamics
  • Especially for spindle solutions that are meant to machine optical components
  • Higher spindle speeds
  • Greatly improved reliability
  • Maintenance-free


* bei 0.2 mm Plananlagenspalt; begrenzt durch Kolbensystem / at 0.2 mm axial gap; limited by piston pack


* bei 0.2 mm Plananlagenspalt; begrenzt durch Kolbensystem / at 0.2 mm axial gap; limited by piston pack

Download Brochure

Download and safe the product catalogue for further information!