Forgot archaic bolt term. Need help.

[BecomingCurmudgeon]

I am having a senior moment and can't remember the term for purposefully damaging bolt threads after installation to prevent the nut from backing off. I had an old detail that used to say damage the threads with a cold chisel until a drafter found that there was a specific word for that. Anyone remember?

 

[BUGGAR]

Of course I would say "Buggar the threads"

 

Nominative Determinism at its best!

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[mfrad]

BecomingCurmudgeon,
I had indicated in my previous post to "strip threads" which I meant to damage the threads below the nut to prevent withdrawl during tightening of the washer and top nut and losing the tension in the anchor rod. AISC has a detail from Design Guide 1, 2nd edition which shows "damage threads".

The archiac term that you were looking for bother me since I couldn't remember as well, although we showed our anchor rod detail with either a double nut or stripping the bottom threads.

As an aside, see the Nord video regarding vibration affecting bolt tightness that should be of interest to all.

https://www.nord-lock.com/insights/videos/watch-the-junker-vibration-test-video/

 

[JAE]

When I hear the term "upset threads" I think of this: