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Old March 8, 2010, 11:36 AM   #6
Senior Member
Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 4,678
I have always hear that one should drill and tap with 6-48, and if they ever strip out, to drill and tap with 8-40 in the same hole.

100 rifles I have drilled and tapped later, I have never had 6-48 fail.

But I have seen broken off screws and bolt in automotive situations, and trying to drill and and then tap the original thread never seems to work well.

I would drill for easy out, put in some Kroil and put on a little heat and see if it will unscrew out of the hole.

If not, I would drill out that screw and make it an 8-40 hole.
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