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A screw or bolt that resists all removal attempts and is irretrievably seized


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What is the issue?
Bolts and screws like most every fastening, have a tendency to seize up on boats due to the challenging sea going environment.

Why address this?
A completely seized screw, bolt or nut can bring a project to an incomplete and frustrating halt.

How to address this?
Drill out the bolt or screw and re-tap a new set of treads.
This is the last resort and labour intensive. However if all else has failed and the fastening must be secured it is the only remaining approach to addressing the problem.

First the bolt and all its threads must be drilled out. Then a set of new thread must be taped into the enlarged hole accommodating a new larger screw or bolt.

If a bigger bolt cannot be used for any reason you can use a Helicoil kit (a ready-made threaded adapter) to replace the original treads. The Helicoil approach is the same as above, in that you tap a new thread into the enlarger hole, but the Helicoil is wound in instead of inserting a new bolt or screw. This in turn becomes the new mating thread for an original sized bolt or screw. Helicoils are typically harder than the metals you can drill and tap so it is highly unlikely that the thread will strip out again. The key with Helicoils is to match the correct drill bit with the correct Helicoil.


With thanks to:
Michael Harpur, Yacht Obsession.

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