Dangerous Bolts on Welsh Slateby Jack Geldard - UKC Chief Editor Mar/2014
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Following a report of a bolt failure, Mark has been out testing the bolts of popular routes with several pulling out at 5kn, a very low load.
However, Mark has just informed us:
"I tested some bolts in the wet yesterday and the results were even worse, two pulled at 1kn."
The bolts that are most affected are those that get the most use, particularly lower-offs on popular routes.
It is thought that the soft slate has worn inside the bolt holes meaning the expansion bolts can move and become loose. Treat any bolt that moves with extreme caution. Resin bolts are not affected.
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