Further to a previous statement made by the NASC in 2012, the confederation has received an increasing number of enquiries regarding its stance on the use of impact wrenches during erection/dismantling and alterations to scaffolding. In order to provide clarity and advice for members and other users of impact wrenches, the NASC has recently completed some testing. A wide range of drop forged couplers from different suppliers in various conditions (new, used, lubricated and unlubricated) were tightened using two popular types of impact wrenches as well as a traditional scaffolding spanner. In excess of 60 tests were completed.
Please see the link below.