CIRP Encyclopedia of Production Engineering

2014 Edition
| Editors: The International Academy for Production Engineering, Luc Laperrière, Gunther Reinhart

Tool Holder

  • Christian BrecherEmail author
Reference work entry



Tool interfaces form the mechanical link between the machine tool and the exchangeable tool.

Theory and Application


As a direct link between the machine tool and the tool, the tool interface directly affects the performance and quality of the machining process.

The demand for drilling, turning, and milling tools that may be used universally on different machines has led to standardized interfaces being formed from the various manufacturer-specific systems. Due to the increasing degree of automation, current interface systems are now largely equipped for automatic tool change.


For manual tool change only the Morse taper according to ISO 296 is used (Fig. 1) on shop floors in some cases. The force and torque transfer is achieved via the frictional contact of a self-locking taper angle of 1:20. For higher loads there are models with a clamp thread...
This is a preview of subscription content, log in to check access.


  1. DIN 69871 (1995–10) Tool shanks with 7/24 taper for automatic tool exchange. Beuth Verlag, BerlinGoogle Scholar
  2. DIN 69872 (1988–07). Retention knob for collet clamping. Beuth Verlag, BerlinGoogle Scholar
  3. ISO 296 (1991–04) Machine tools; self-holding tapers for tool shanks. Beuth Verlag, BerlinGoogle Scholar
  4. ISO 12164 (2001–12). Hollow taper interface with flange contact surface. Beuth Verlag, BerlinGoogle Scholar
  5. ISO 26622 (2008–11) Modular taper interface with ball track system. Beuth Verlag, BerlinGoogle Scholar
  6. ISO 26623 (2008–11) Polygonal taper interface with flange contact surface. Beuth Verlag, BerlinGoogle Scholar
  7. Kocherovsky E (1999) HSK handbook. Intelligent Concept, West BloomfieldGoogle Scholar
  8. Schubert I (1994) Grenzlastverhalten von schnittstellen zwischen maschine und werkzeug [The behavior at critical load of the interface between machine tool and tool]. Shaker, Aachen (in German)Google Scholar
  9. Weck M, Reinartz T (1999) Untersuchungen von werkzeug- und spannsystemen unter sicherheitstechnischen gesichtspunkten [investigations on tool and tool-clamping systems with focus on safety]. Institut für Arbeitswissenschaft, Kassel (in German)Google Scholar

Copyright information

© CIRP 2014

Authors and Affiliations

  1. 1.Werkzeugmaschinenlabor der RWTH AachenAachenGermany