Blue Loctite

[Steve Wood]

A thread chaser is a dull tap that tends to clean out existing thread rather than recutting and making it weaker

[daveismissing]

and bottoming?

[Steve Wood]

Flat on the bottom so it can fully cut threads all the way to the bottom of the hole

[SuperSix]

I'm a bad man - I used a die to clean bolt threads. 

I need to get a thread chaser kit.

[Scott87]

Flat on the bottom so it can fully cut threads all the way to the bottom of the hole

A bottom tap would fully cut to the bottom too..

I encounter the tap vs bolt problem for cleaning threaded holes. The idea being the threads in the hole and on the student / bolt stretch the same.  Sometimes being the threads have been put passed the yeild point. 

Other than that I prefer tapping holes to chase the threads for cleaning.  As an alternative use a hardened grade bolt for cleaning if the threads look good.

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[84 BuickGNYorkPA]

Dull tap, well that clears that up. Come to think of it, that's all I've ever used.... ha ha ha.


Chuck

[smokin-6]

OK, I check out the threads on my Turbo Saver last night, they all look to be fine. It will turn in about 2.5 turns by hand and another 2 turns with a wrench. I cleaned it real well with brake clean and ended up using some liquid sealant with tephlon and it will sit for 3 days before install. I will put it back on this weekend and pray she don't leak.

This is all from Precision so hopefully they use quality parts.

[Steve Wood]

bet your mother in law's money on that