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PM08 – Multi-Jackbolt Pretensioner (MJP)

with Mammoth™ Jackbolts

Technical Specifications

  • steel property class 8 according to ISO 898-2
  • operational temperature from -10 to +250 °C 
    Note: At high temperatures, a reduction of preload will occur
  • tension at core cross section 90% RP 0.2
  • standard diameters M16 … M160
  • for pretensioning forces FV nom. 70 … 6230 kN
  • special versions/larger dimensions on request


Mechanical Multi-Jackbolt Pretensioners (MJP) type PM08 are designed according to ISO and correspond to steel property class 8 for nuts on bolts 8.8 (specified up to M39 according to ISO). All dimensions are specified according to the same guidelines.

Mechanical Multi-Jackbolt Pretensioners (MJP) type PM08 are used for general bolting applications in all areas of industry. Due to the captive mounted Mammoth™ Jackbolts, PM08 are best suited for highly dynamic applications such as turbine runners.

The hexalobular head (Torx®) of the Jackbolts is extremely wear-resistant and safe to handle.


General mechanical engineering, shipbuilding, heavy mechanical engineering, power plants, chemical industry. Used on couplings, slewing bearings, foundations, presses, bolted split joints and many more » see Applications




If you have any questions, please do not hesitate to contact me.

Robert Ploke Mail Contact Tel. +41 55 284 11 33