Tunnelling Bolts


We have a long history of being a leading manufacturer and supplier of specialist tunnelling bolts and accessories to the tunnelling industry.

We are experienced designers and manufacturers of high integrity connection and embedded accessories for concrete segmentally lined tunnels.

Our production and distribution facilities in North America, Europe, and Asia make us perfectly positioned for your requirements.

Tunnelling Product Expertise

With full ‘in-house’ facilities, we are capable of manufacturing a comprehensive range of tunnelling products. The fastener range includes sizes from M12 to M100 as standard and we are able to manufacture special fasteners for bespoke requirements and to customer specific drawings.

We have expertise in the manufacture and moulding of products for the global tunnelling industry offering contractors a ‘one-stop shop’ for a comprehensive range of tunnelling bolts and plastic fittings, including bolt sockets, dowels, spacers, grout/lifting sockets, plugs and non-return valves.

Our products are supplied, packed and labelled to global export standards with all the necessary documentation.

Tunnelling product videos

We have developed 3D animations for the bolting system, the magnetic socket holder and the anchored guide rod.

  • The CPR-Bolting system, that shows how a segment is installed in the tunnel, thanks to our spear bolts and the bolt sockets.

  • The CPR-Magnetic holder, that shows the principle of this new holder, that enables to cast sockets anywhere in the mould, without facing de-moulding issue. Instead of self-breakable system, you can re-use this holder for each casting. It can be used to hold bolt socket or grout socket in segment moulds.

  • The CPR-Anchored guide rod, that shows our brand new guide rod system. Instead of gluing the rod on the segment, it is positioned directly in the mould before casting, to make it perfectly anchored in the concrete segment.