Bolts and other fasteners are critical in a multitude of constructions - from machines that include smaller bolts and nuts, to sheet pile walls, cranes, bridges, wind turbines and other large constructions.

There is a risk that the bolt will become the weakest link in a structure and hence the first component for replacement. It may pose a risk to the safety of the construction, just as it may entail large costs in relation to downtime and repairs. 

This guide provides you with an overview of factors related to bolts that you should be aware of to ensure the quality of your construction - both before installation, if you need to assess the remaining service life, and if failure occurs. 

Bolt fracture surface
Bolt fracture surface – a typical bolt fracture occurs just beneath the head or in the first load-carrying threads.
Fracture surface on bolt
Corrosion and other conditions can affect the life of a bolt.

Before installation 

To avoid costly damage and replacements, you should examine or test the following issues/topics before installing bolts in your construction.

Continuous maintenance and assessment of remaining service life 

Once mounted, the bolt is a critical factor as regards the safety and service life of the overall construction. Therefore, it is important to ensure ongoing maintenance and assessment of the remaining service life to avoid for example failure and downtime.

When the damage is done 

Even if you have taken your precautions, the risk of failures is still present. In that case, the failures should be investigated in order to avoid them in the future.