The distinguishing feature of the Bolt Tensioners of product group 7 is that a multistage cylinder-piston-set is placed over a bolt thread and, then, screwed down where the pulling thread is part of the top piston.

Main Features


  • multi-stage
  • thread in top piston
  • for continuous or recessed bolt threads

Advantages of PG
  • high pre-tensioning forces at small outer diameters
  • height smaller than PG 6
  • larger cost-efficiency than PG 6
  • lower disassembly height than PG 6
  • lower weight than PG 6

Examples of Applications
  • whenever generation of large pre-tensioning forces should be as
    close as possible to sealing boundaries, or when a low installation
    height is imposed
  • turbine construction

More SSV

We distinguish our Bolt Tensioners into 8 different product groups (designs)
which, in principle, have all the same function.