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PB Radial Pretensioning Bolts (RPB)

for combined axial and radial pretensioning

The unbeatable combination of all advantages for combined axial and radial pretensioning on large couplings:

– PM Multi-Jackbolt Pretensioners (MJP)

in conjunction with

– Conical Bolt and Conical Split Sleevee

PB Radial Pretensioning Bolts (RVB) are an exclusive development from PLOKE Engineering and are especially suitable for the positive pretensioning of highly dynamic components such as flange couplings or dynamically loaded foundations. They also compensate for misalignments, eliminating the need for time-consuming machining of the flange bores.

Mechanical Radial Pretensioning Bolts (RPB) are used for highest strengths bolting in all areas of industry. Due to the captive mounted Mammoth™ Jackbolts, RPB are best suited for highly dynamic applications such as turbine runners.

  • International PCT Patent Application WO2018/065898
  • United States Patent No.: US 11,092,186 B2


Technical Details » see PB Basic Series



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


Design / Requests

Each Radial Pretensioning Bolt is individually designed for the respective application. The data listed here is for information purposes. Please enquire with us using our “Enquiry sheet for couplings”.




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

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