SLH-x (Self-Locking Tool Clamping System)

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– Patented Built-in spring-less tool clamping systems for HSK interface connections, DIN69893 –

SLH40 (HSK-E40)

About our patented clamping units “SLH-x”
– what you can expect
For hollow shank taper (HSK) tool interface to DIN 69893
Based on a principle of monolithic pre-loaded self-locking
Ultra-compact, simple, robust and maintenance-free
Available Sizes:
SLH20 (E20)
SLH25 (E25)
SLH32 (E32)
SLH40 (E40)
SLH63 (E63)
Form-A on request

While based on many additional mechanical components, conventional spring-based clamping mechanisms lead to issues for the user ever since. These are

  • Inconsistent and poor shaft dynamics (due to moving spring elements and long spring systems)
  • Inconsistent tool clamping with respect to pull-in force and clamping position (due to fatigue of the spring elements)
  • Not applicable for short shaft designs as reuired for robot arms e.g. (due to excessive spring system length)
  • Excessive wear (especially within the spring system)
  • Overengineered and expensive design
  • Bearing protection necessary (because when ejecing a tool, an external force fhas to deliver the pre-load of the spring system, plus the eject force itself)

Because of these reasons and because spring-based clamping systems didn’t give us the clamping consistency, repeatability and controlability we need for our spindle solutions, we developped our spring-less built-in HSK clamping units “SLH-x”. Based on the principle of monolithic preloaded self-locking, we did not only manage to get rid of any spring system required, but also to create a very robust, simple and short solution to clamp tool holders accoring to “DIN69893”. The result gave us so much more than expected. Consistent and improved shaft dynamics combined with sheer robustness over even 2 million tool change cycles lead to a significant improvement of our spindle products since the first series in 2017. Also our assembly department highly appreciates our SLH-x. Because of its simplicity and unique feature that it can be extracted from the spindle without disassembling it, makes production control of our spindle solutions much easier along with other benefits like

  • Improved and consistent shaft dynamics, even over 2 million tool change cycles,
  • Higher spindle speeds possible,
  • Reliable tool clamping, even over 2 million tool changes,
  • Reduced rotating masses,
  • Easy-to-maintain spindle design,
  • Simple in design and cost-effective,
  • No bearing protection system requried.

Machine and spindle OEM’s using our SLH-x confirmed that the self-locking is safe even at rouhing operations or high speeds.

What does “SLH-x” mean?

“SLH-x” stands for “spring-less/self-locking HSK clamping” (DIN 69893)

Detailed explanations:
  • Spring-less: While spring-based systems use spring systems to continuously generate the force that pulls in the tool holder into the shaft taper even when the shaft is spinning, this force is generated once and maintained by a pre-loaded state. Thus, no spring system is used.
  • Self-locking: After an initial and external force to pull the tool holder into the shaft taper, our SLH-x self-locks its position and doesn’t need any externally or internally generated force than the initial pre-load force. In this state the tool remained clamped until it is released by an external one.
  • Hollow shaft taper tools (HSK): The HSK interface features a pressed taper fit, for example, between the shaft internal and the tool holder external taper. What sets it apart from other taper clamping systems is the simultaneous use of a flat contact connection, which not only results in a substantial increase in stiffness, but also allows axial repeatability of less than 0.2 micron.

SLH-x – Simple, compact, robust, repeatably accurate and maintenance-free.

Problems with conventionalm, spring-based HSK clamping systems
  • Large in size and complex constructions
  • Inconsistent behavior over time concerning clamping position, pull-in force and shaft imbalance
  • Damaged or fatigued disc-springs
The advantages for the end-user
  • Consistent clamping and release position and clamping force even over 2 million tool change cycles
  • Consistent balancing quality and outstanding shaft dynamics
  • Particularly suitable for tool spindles for machining optical components
  • Greatly increased speed stability
  • Greatly improved reliability
  • Maintenance-free
The advantages for the spindle manufacturer
  • Significantly reduced number of components
  • Ultra-compact design with a simple & robust design
  • The shaft can be extracted without removing the clamping system
  • Non-rotating push-pull rod possible
  • Compared to spring-based systems, 70% reduced eject force to protect the shaft bearings
Data of the different sizes
SLH-20 (HSK-E 20)
SLH-25 (HSK-E 25)
SLH-32 (HSK-E 32)
SLH-40 (HSK-E 40)

SLH-63 (HSK-E 63)
Product Catalog

Clamping unit “SLH-20”

The the SLH-x video

Your contact

Do you have any questions, need further information or want to purchase one of our products? Great! Then contact us at any time.

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Oliver Moeller