The maintenance free bolt connection
with TTG


As a result of the shrinkage of the ShrinkNut Nutbody the following advantages occur compared to regular threaded connections:

  • No loosening of the connection - even with steady vibration influences
  • Higher and torsion free pretensioning of bolts
  • Decreased rupture risk due to perfect load distribution over the whole nut height
  • 100% thread contact due to opimised TTG
  • Maintenance free connection
  • Dimensions similar to standard hexagonal nuts
  • Standard bolts, thread sizes and thread pitches of any kind can be used



The standard version of the SCHAAF ShrinkNuts comprises the following components:

  • High-strength quenched and tempered steel for maximum strength and axial load capacity
  • Friction value maximised pressure ring
  • QR-code marking for various documentation techniques
  • All thread types, thread pitches and norms
  • Surfaces according to different requirements
  • Modern CAD and FEA-analyzations
  • Customer specific solutions

Areas of Application

SCHAAF ShrinkNuts are the optimum solution wherever a permanent maintenance free threaded connection, even with steady vibrations, must be ensured, for example wind turbines, gear box and heavy equipment, electric generators and motors.


Quality Assurance

All ShrinkNuts are checked for material quality, dimensional accuracy, proper operation and reliability. They are subject to quality assurance measures during order execution and delivered with detailed documentation.



ShrinkNuts are, of course, delivered packaged ready for installation. SCHAAF ShrinkNuts are user-friendly, reliable and are manufactured in accordance with the highest level of technical know-how. Our highly-motivated staff will be pleased to train your personnel, in situ or at our works, in the general handling of ShrinkNuts.

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