Re: Thread tap suggestion
They work easier.
Stronger tap that is harder to break as there are no flutes (although some will have 1 small flute in them, but it is for cutting fluid to escape from a blind hole)
No back turning required just turn in till your through or to the bottom.
Still is nice to use some tapping fluid.
Threads are stronger as the grain pattern of the formed threads is more like that of a forged part.
I use them mostly in aluminum, have started to use them in steel as well with very good results. About the 2 biggest issues with them is that they require a larger tap drill size, and because they are displacing the metal you can not go back and redrill again deeper as you will be removing part of the threads. Also because they displace metal, typically have to chamfer the hole a bit deeper as the first thread will be pushed out above the surface slightly.
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Jeff
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