We are an experienced Swiss engineering company with a focus on worldwide unique bolted connection solutions according to the MJP principle (mechanical Multi-Jackbolt Pretensioner) for the absorption of the greatest forces.

Our field of activity covers all areas in which large, safe and, above all, detachable bolted connections are required. We calculate, develop, construct and produce the best technical and economical bolting solutions for large dimensions and high, precisely adjustable prestressing forces, according to the specific requirements of our customers and on the basis of our high-quality mechanical Multi-Jackbolt Pretensioners.

We offer our services and products all over Europe. Our customers can be certain that our sales engineers and sales partners offer personal and competent service. We will provide support during installation of the bolted solution and during maintenance work.

Benefit from our many years of experience as a technology leader for high-duty bolted connections of large diameters. We would be glad to provide you with our comprehensive know-how and look forward to a successful cooperation.


Established in 2014 - experience since 1988

Robert Ploke Robert Ploke has been active in this field since 1988. He has accompanied countless bolting projects throughout Europe in many areas of the heavy industry. Through his many years as co-owner and managing director of the former company P&S Vorspannsysteme AG in St. Gallenkappel, whose co-founder was Rolf Steinbock and his father Gerhard Ploke, he brings with him a wealth of experience and he is well aware of the special requirements in this field.