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Forgot archaic bolt term. Need help.

Forgot archaic bolt term. Need help.

Forgot archaic bolt term. Need help.

(OP)
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?

RE: Forgot archaic bolt term. Need help.

(OP)
You gave me a lead. The old word that we used to use was "to upset the threads" with a cold chisel.

Thanks for jogging my memory.

RE: Forgot archaic bolt term. Need help.

Deforming the threads, or deformed threads.

RE: Forgot archaic bolt term. Need help.

Mar the threads.

RE: Forgot archaic bolt term. Need help.

Stake is the word used in aerospace.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy

RE: Forgot archaic bolt term. Need help.

Strip threads.

RE: Forgot archaic bolt term. Need help.

(Though not my native language): mar.

Huub

RE: Forgot archaic bolt term. Need help.

I'd say 'stake'.

Ted

RE: Forgot archaic bolt term. Need help.

I have seen peen, upset, mar, stake, and deform all used on past drawings.

RE: Forgot archaic bolt term. Need help.

Usually what I have seen people use mar, upset, peen; as terms to damage the threads so that a nut cannot be lost.
But if you want to lock it in place Then you need to make that clear. Two slightly different functions.
"Stake, peen, upset (pick a term) threads to lock nut in place"

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy

RE: Forgot archaic bolt term. Need help.

Staking would also describe deforming the nut to create interference with the bolt thread. For example, center punching the nut face near the thread interface to deform the nut material into the bolt thread.

Ted

RE: Forgot archaic bolt term. Need help.

While this is not what the OP asked for, can I suggest the use of castle nuts? Same principle, but better and more reliable (or much less user dependent). Just needs drilling in situ for a cotter pin.

RE: Forgot archaic bolt term. Need help.

We use the terms deform or peen if referring to the bolt threads. As hydtools said, staking typically refers to deforming the nut, which is difficult to accomplish except with a slotted bolt and a stake nut.

Rod Smith, P.E., The artist formerly known as HotRod10

RE: Forgot archaic bolt term. Need help.

The term I would choose is 'indictable'.

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

RE: Forgot archaic bolt term. Need help.

(OP)
I think that I will stick with 'upset the threads' for now. It has a poetic aspect to it like a murder of crows.

RE: Forgot archaic bolt term. Need help.

'upset the threads' is what trolls do.
What would be the term for a large congregation of trolls?

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

RE: Forgot archaic bolt term. Need help.

The term " Distressing" the threads has also been used in some quarters. The German aircraft manufacturers were infamous for using plain nuts and belting the protruding threads with a hammer. until not too recently.
It made it extremely difficult to dis-assemble some of their stuff.
B.E.

You are judged not by what you know, but by what you can do.

RE: Forgot archaic bolt term. Need help.

I've always used "foul threads"

I would not recommend "strip threads", as this would cause the nut to just slide right off.

RE: Forgot archaic bolt term. Need help.

Of course I would say "Buggar the threads"

RE: Forgot archaic bolt term. Need help.

Nominative Determinism at its best!

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

RE: Forgot archaic bolt term. Need help.

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-th...

RE: Forgot archaic bolt term. Need help.

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

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