Our specialities


Rock support – combination bolts with long service life


We produce and offer to the market rock anchor bolts with particularly long service life using PC-CoatTM corrosion protection (hot dip galvanizing, zinc manganese phosphating and epoxy powder coating). In order to fully control product quality to very high standards, manufacturing is completely done in our own premises, both mechanical production as well as all steps of corrosion protection.

We are producing two types of combination bolts, NC-Bolt and PC-BoltTM. Combination bolts are effective for immediate work protection at the face after torque tensioning, and when later fully grouted, can be classified as permanent support. Workers are installing rock bolts in the face area while grouting of the bolts takes place at a convenient time and distance behind the face (typically about 50m). Combination bolts contribute to efficient tunnel advance and when needed, we also offer self drilling anchors (SDA), either HDG- or PC-CoatTM protected.

Presentation of combination bolts for download: PowerPoint or PDF.
Installation video of PC-BoltTM and NC-Bolt.

For further information, please contact our sales team:
Erik A. Karlsen, erik@pretec.no, +47 977 13 810 (UTC +1)
Even A. Karlsen, even@pretec.no, +47 908 45 246 (UTC +1)
Tony Tang, tony@chinapretec.com, +86 139 6735 8765 (UTC +8)

Catalogs relevant for the rock support segment

NC-Bolt Catalog

NC-Bolt Catalog

Pc-Bolt Catalog

Pc-Bolt Catalog

Grouting Catalog

Grouting Catalog

Pc-Coat Catalog

Pc-Coat Catalog


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