Increased Lifetime

TTG

Targeted equal force in the thread area

TTG is a special, patented process for manufacturing threads in nuts or on bolts. This manufacturing method promises optimum fitting accuracy in the thread when tightened. In addition to longer durability, bolts with TTG can be subjected to much higher loads. As a result, the diameter of the connection can be reduced and thus immense material savings are possible. Threads with TTG revolutionize the connection possibilities and save money.

The task of a bolt is to connect two or more components. This happens due to the axial bolt pretensioning force. But what is the axial pretensioning force? What is a thread? Basically, a thread is a sloping level which is wound up. If you screw a nut on the bolt thread, it follows this sloping level – the flank lead. When the nut reaches the flange you generate bolt elongation and flange compression by further screwing. This bolt elongation is the aforesaid pretensioning force and is a result of the stretched bolt material. Taking a close look at the pretensioning force generation, usually it has impact on the nut due to a torque. This equals a torsional stress on the bolt, which works against the bolt in its actual function. That is the reason why Bolt Tensioners, Hydraulic Nuts and Multiple Stud Nuts are used, which do nothing else than pretensioning the bolt purely axial and torsion-free. In general although, any pretensioning force generation does not only elongate the bolt shaft, but also the thread. A distortion of the heavily loaded thread occurs, which does not comply with the original geometry of the nut anymore. The patented idea of SCHAAF GmbH & Co. KG is to copy the profile of the highly pretensioned bolt thread in the nut area and to transfer it to the nut with the exact change of geometry. What is the result? The whole flank surface of the bolt has an equally exact contact with the nut with TTG thread. Therefore, there is no stress concentration as before in the first thread turns where nut and bolt touch. Instead, the pretensioning force distributes equally over the complete geometry. Highly stressed threads, which are mostly charged with additional dynamic load, receive a higher longevity, higher safety at same component size and with insignificant higher costs.
Hauseigene Produktion Symbol GB
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Made in Germany SCHAAF GmbH & Co. KG
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TTG - 100% flank contact over the complete area

Not tensioned
Pretension
Tensioned
Not tensioned
Pretension
Tensioned

Normal thread

Not tensioned
Pretension
Tensioned
Not tensioned
Pretension
Tensioned

Advantages

  • Nut and bolt flanks have a 100 % contact at the pretensioning force and the load distributes equally on the complete thread bearing surface
  • The permanent risk of fracture with highly stressed connections is significantly decreased
  • Bolt fractions in the first thread turn can be avoided
  • Low costs
  • More resilient connections
  • Higher machine safety
  • Due to geometry displacements, tension launching is even possible in the upper part of the nut
  • Due to nuts with TTG, bolts with the identical cross sections can be stressed, respectively pretensioned higher. The connection becomes safer
  • TTG is independent of the nut material
  • TTG improves every bolt connection

Proven security

The TTG patented by SCHAAF has been extensively tested in several test procedures by the Fraunhofer-Gesellschaft as part of its technology research and has been awarded internationally valid certificates.

Results of the fatigue tests

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Industry-specific special solutions:

All SCHAAF products offer an individual solution for every industry.

TTG proves particularly effective for:

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