On Sat, 6 Apr 2002, Bill Babcock wrote:
> One little piece of the question that didn't get answered--how good is a
> helicoil. The answer can be very good, depending on who makes them. The
> best thread inserts are not actually helicoils, but solid
> inserts--helicoils introduce a diamond-shaped spacer between the female
> and male threads which is not necessarily the strongest solution. I bought
> some thread inserts at a swap meet that are solid. You screw them in place
> and then drive down three square pins that cut into the base threads and
> lock the insert from turning out. The thread insert material is very hard
> and strong. I have no idea who makes these, but they work great. I had
> some problems with the frame of my radical (bolts pulling out of the mild
> steel inserts welded to the tubing) and these inserts eliminated the
> problem.
Key inserts are the things you're talkin about.
They are used in aircraft frame repair.
regards,
rml
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