On 3/27/2011 10:47 AM, Stephen Wille Padnos wrote:

> Wouldn't these still leave a few threads at the bottom that aren't fully
> formed?  Do you find that bolts can be threaded further into the hole
> than with a cutting tap?

A bottoming roll form tap will get you very close to the bottom. If you 
really need that last thread or two, you could always follow up with a 
bottoming cut tap. As the hole is larger than normal for a given size, 
there's no trouble, but those last couple threads won't be full form.


Jon

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