The document discusses problems with fasteners unwinding from thin materials less than 2mm thick. Key issues are the lack of metal to form threads and coatings that lubricate threads, making installation and removal easy but also allowing vibration to loosen the fastener. Over-tightening fasteners increases the risk of the stresses pushing them out. Potential solutions discussed include drill tip design, preventing overtightening, non-tapping alternatives, fasteners that drop through the material instead of remaining engaged, and better joint/component design and installation practices. However, fastener manufacturers cannot address all problems alone and specification changes focused only on cost can undermine demand for specialist products.

1. The problem of unwinding fasteners SFS intec

4. Clever design - the drill point pushes metal aside to create a thicker zone that allows better thread forming Purpose made drill tip into 0.7mm sheet Conventional drill tip design cuts away all metal, thread only works in sheet thickness Possible solutions

5. main fix into 0.7mm special tip into 0.7mm this design gives much better pull out resistance and higher grip levels into the sheet

8. Free spinning - "drop through" designs After drilling and tapping, the threads drive right through the work piece, before dropping out below. This leaves the threads disengaged from the work, preventing overdriving and backing out ....esktop009 presentationsodcast & videos Clamping Fastener.wmv ....esktop009 presentationsodcast & videos Top Hat.wmv non-spin design Possible solutions

9. Better joint design, guidance and practice One for the trade… Image courtesy of the MCRMA Possible solutions

11. Thank you www.airtight-security.co.uk