On 2008-12-07, Tim Wescott wrote:

[ ... ]

One of my clients (aerospace) uses Kingserts almost exclusively for this,
with great success. I have no clue how much more expensive they are than
Helicoil, but they look a lot stouter.

"Kingserts"? I'm not familiar with them, but I am familiar with
"Keyserts" -- threaded OD (different pitch than the ID, unlike a
Helicoil) which screws into a tapped hole, then a special tool drives
two or four projections down through the threads in the metal block
(there are already grooves for the threads in the Keysert), thus locking
it into place.

I've seen them advertised in stainless, and I've used some small
ones in a metal which looks like zinc plated steel -- the ones which I
have are all nearly black, though I don't know what they looked like
when new.

They do require a larger tapped hole because of the different
thread pitch on the OD from what is accepted on the ID.

Enjoy,
DoN.

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