Threads rolled vs cut

NDimitrov · May 28, 2024

Hi all,
the answer to my question is in almost every engineering book, but how far off are single point cut threads from rolled ones ?
To my knowledge the best scenario, regarding strength and fatigue life is rolled threads after heat treatment,
but that's quite difficult to achieve in the home shop for external threads .
So my main question is how would you approach making studs in the home shop ?
Kind regards

SwinnyGG · May 29, 2024

If you have to make them, cutting them with a lathe or die is your only real choice.

enginesrus · May 30, 2024

And this has what to do with Engines and fuel? Its more of a Machines and Machining question.

btrueblood · Jun 4, 2024

"how would you approach making studs in the home shop ?"

You can buy threaded rod in ridiculously long chunks, made to thread and material/bolting standards of your choice, from most fastener houses. Cut them to length, chamfer the ends and chase the threads, done.

mfgenggear · Jun 9, 2024

You can roll threads on a lathe.
They sell roll dies that mount like a tool bit.
Just note roll threads require major diameter to be modified. Google dimensioning f I r roll threads. Or consult sales eng to help you with the correct calcs. You will need to run test
To get correct size.

mfgenggear · Jun 9, 2024

I recommend to buy a set of go and no go gages,
Verify size . Second option is to have it thread ground from solid. Just machine tiny centers at each end.

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Threads rolled vs cut

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