[Boatanchors] How to repair stripped panel threads

[rbethman]

I suspect that just a "dab" of JB Weld applied to the ho;e would cure, 
allowing for the screw to take hold.

It is a temporary fix at best.

Perhaps affixing a "small" piece of the same type of metal behind the 
hole with JB Weld, drilling out the hole, and working it "may" be the 
way toward a longer term solution.

Bob - N0DGN

Ron wrote:
> Helicoil would work great for full threaded holes.
> For a panel I would install a pem nut.
> ---
> Ron
>
>
>
> WA5CAB at cs.com wrote:
>> John's reply later in this thread is absolutely correct.  The 
>> helicoil is the preferred method in industry and the military for 
>> repairing stripped threads.  I've used them successfully down to 
>> #2-56 UNC.  The helicoils themselves are cheap, and in each thread 
>> size come in several lengths.  The dollars are in the special tap and 
>> the installer and drive tang breaker.
>>
>> A helicoil is a length of almost (*) square bar coiled up such that 
>> the ID is slightly greater than the original thread's minor 
>> diameter.  The special tap has the same pitch as the original thread 
>> but a pitch diameter equal to the original plus the radial diagonal 
>> dimension of the bar.  You drill out the original tapped hole with 
>> the correct diameter bit, run the special tap through the hole, and 
>> screw the helicoil into it.  The helicoil has a drive tang bent 
>> across the inner end that must be broken off after insertion.  If the 
>> length of the helicoil exceeds the panel thickness, it is best to cut 
>> the excess off with something like a Dremel tool and abrasive disk.
>>
>> (*) The bar is actually a "Squashed" square, as standard V-form 
>> threads are 60, not 90 degree.
>>
>> There are some other methods.  Usable in sheet metal is the nut-sert, 
>> which is somewhat similar to a hollow pop-rivet.  The drawbacks are 
>> that it takes a relatively large diameter hole and leaves what 
>> amounts to a flat washer on the outside surface.  Two others come to 
>> mind but are generally only usable in aluminum or brass castings and 
>> wood.
>>
>> In a message dated 12/12/2008 11:30:44 PM Central Standard Time, 
>> texasroadrunner at comcast.net writes:
>>> I'm sure this subject has come up before, but couldn't find any hits 
>>> via
>>> google groups.
>>> Wondering what folks on this list have used to repair stripped threads?
>>> I've experienced way too many over tightened fasteners which attach BA
>>> panels to their chassis.  Currently I have a bunch of panel screws on a
>>> Navigator- some are too loose due to over tightning.    One gent 
>>> suggested
>>> dipping and curing toothpicks in Devcon epoxy and then placing them 
>>> into the
>>> hole before screw insertion.  Short of welding (JB?) a nut on the 
>>> back end
>>> of the threads, looking for other ideas out there.
>>
>>
>> Robert Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
>>
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-- 
Bob - NØDGN