CROSS reports screw bolt anchor failure 25 September 2015

The latest CROSS confidential report on structural safety from the Institution of Structural Engineers includes a report on the failure of a number of screw bolt anchors securing suspended scaffolding.

CROSS is a confidential reporting system operated by the UK’s Institution of Structural Engineers and modelled on long established systems used in the aviation and maritime industries. It is the first such confidential reporting scheme to deal with structures. Individuals and firms participate by sending reports of their experiences and concerns in confidence. The names of reporters are never revealed and only the technical aspects that could help structural engineers are published. Expert commentaries are often appended to the reports. For more details refer to

According to the confidential report submitted to CROSS’s July newsletter, Number 39, the discovery that a number of M12 x 100mm hexagon screw bolt anchors had failed was made when the scaffold was being removed. Fourteen screws, representing around 8% of the total used, had failed but in some individual brackets seven out of eight bolts had failed. A subsequent investigation involving the main contractor, screw manufacturer and scaffold installer was unable to identify the primary cause of failure, even after laboratory inspection of the failed fixings.

The full report is published in the July Cross Newsletter at:


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