SCHAAF solution for a Tower Flange Stud Tensioning System Documentation – Efficiency – Quality

The design of the tools is focused on simplicity in order to reduce costs and enable more intuitive operation. For example, no additional motor is used to operate the tools. Instead, a standard cordless screwdriver system is used with a universal fastening system that fits a wide range of tools. Visual signals indicate whether the tensioner is being operated within its limits (in particular correct bolt protrusion and maximum piston stroke) to increase work safety. The handwagon also works without motors. Manual force is sufficient for the tangential movement on the flange. The integrated tool lifting mechanism supports the operator with a system of two or more gas springs to reduce the manual force required for lifting during operation.


  • Optimized Tool design: All parts are designed for min. 100.000 LC. Service interval is 10.000 LC/12 months and preventing collision with obstacles (tower wall, cable tray, ladder, weld seams) for a long life-time and simple handling for the operator
  • Suitable for marine and offshore environment: robust against outer influences up to Ip67
  • Increased lifetime of the bolt connection: TTG increases the possible residual force of a bolt connection and OBLM is used for real time load monitoring
  • Full documentation including bolt elongation, residual force and flange gap evaluation for every bolt connection to achieve maximum security


All conceivable special designs are possible. Please let us know your requirements.

fsts montage

Areas of Application

SCHAAF FSTS is the optimal solution, where constant monitoring can prevent damages or injuries. Additional estimated bolt loads during design stage can be proved if correct. Especially for connections with permanent vibrations, weather related and temperature changes or load changes, for example wind turbines, bridge construction, cranes, electric generators and motors.


Quality Assurance

All FSTS are checked for 100 % process security. During order handling, they are accompanied by ongoing quality assurance measures and supplied with extensive documentation.




SCHAAF FSTS are user-friendly, reliable, and manufactured in accordance with the highest level of technical know-how. Our highly-motivated staff would be pleased to train your personnel, in situ or at our works, in the general handling and operation of the mobile and stationary control unit. In this way, all the process parameters can be entered optimally in order to achieve maximum process monitoring and safety. Of course, the FSTS are supplied ready for operation.

Related Accessories


TTG is a special, patented process for manufacturing threads in nuts or on bolts.

OBLM – Accurate long-term bolt load monitoring and safety failure warnings.


Impression / Animation
Pour lire toutes les informations.
Voir les projets en lien avec SSV.
Online Meeting / Webinar
N’hésitez pas à nous contacter pour recevoir une présentation en ligne gratuite sur ce produit.

Industry-specific special solutions:

All SCHAAF products offer an individual solution for every industry.

FSTS proves particularly effective for:

Plugin WordPress Cookie par Real Cookie Banner