Driving sheet-metal screws into 4130

"Henry Bibb" wrote in message
ink.net...
Just a caution on the Harbor Freight rivnut tool. I found the #6 mandrel
included with mine was undersized, and would not engage the threads of
the #6 rivnuts well enough to crimp them. The #8 worked fine*; I haven't
tried the other sizes. Just something to look out for if you're planning
on
using #6s.

*By working fine, I mean it pulled some righteous brand-name RivNuts.
The #6 didn't work with either the HF or brand-name ones. A dial
caliper vs a screw checker revealed the undersizing issue. It just pulled
the thread out of the rivnut. Actually, just pulled the crest of the
thread,
since the mandrel didn't reach all the way to full thread depth.

I'll watch for that, Henry. I bought one a couple years ago when they were
on sale, but it's still in the package.

Rich S.