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Thread: Best ways to prevent boat theft?
29-07-2006 12:12 PM #17Gorilla_in_ManilaGuest
Re: Best ways to prevent boat theft?
Depends where the bolt broke. My guess is it would have broke on the threaded section of the bolt near the bottom of the nut; ie the full depth of the nut away, on the other side of the tack weld. If he was using a shifter he must have had that on the nut, and applied enough torque to break the bolt at is weakend point near where the shank meets the thread or where you have the thread in a shear plane.
So my guess would be it had nothing to do with the tack weld and everything to do with leaving the U bolt (cruddy or not) for a long time in an extremely stressful situation.
Same like wheel studs that have rusted / fused to the wheel nut (usually after being over tightened with rattle guns) can be fairly easily twisted and broken, unless they are given a good long soak with WD40 first. No tack welds here, but happens quite regularly, and you'd see a similar break pattern.
By the way, you didn't mention anything about your mate grinding off the tack welds before leaning on the nut with a shifter.
But you destroy the nut and the bolt by doing so anyway. By tack welding any nut and bolt, you are already making the decision that the bolt and nut will be destroyed as soon as it needs to be removed.