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Re-tapping damaged thread

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Mike Poole

06/12/2014 22:21:44

3676 forum posts
82 photos

Running a tap through will cut away any damaged threads but the cut material used to be a thread, screwing a bolt through will tend to reform the damaged threads to the places the deformation came from so no material is lost. A helicoil is likely to make the strongest repair as it is effectively a larger bolt. I have helicoiled quite a few threads on motorcycle engine cases as even though I do not regard myself as ham fisted, threads in aluminium castings tend to fail after being dismantled a few times, as the owner of a Triumph Trident a strip down was not uncommon and using steel bolts to hold aluminium parts together put the threads under a lot of stress from the differing expansion rates.

Mike

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