Thread ID

[Gregwalker1981]

Hi everyone

can anyone tell me what thread this is i bought a m24 m27 m30 stainless nut thinking it was normal threaded but m24 is to small m30 to large

m27 fits but wont screw as it is wrong pitch

i have attached some pictures if this help

many thanks

 

[Pete.]

Looks like a ball screw. 6mm pitch or 1/4". You ain't ever screwing a standard nut onto that.

 

[RWD3M]

What he said! ^

 

[Erie Fred]

Or coil thread:

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[RWD3M]

Or coil thread:

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

That looks awfully similar!

 

[Erie Fred]

That looks awfully similar!

I noticed in the Op's photo, the end was simply sawed off, and the tread rolling process rolled
a burr over the end.
A ballscrew (even a rolled one) would probably have the end machined better or one would think so.

 

[Seadog]

The fact that there's a nut already screwed onto it would suggest that it's a coil thread.

 

[Agroshield]

I have attached some pictures if this help

What is it being used for?

The coil thread linked to above appears to be used in concrete formwork, for temporary ties until the concrete sets.

We do not use that system in UK, the most common one here is dywidag, a different thread form.

The closest I have seen to that thread is in ground anchors or structural tie rods, and that is quite a niche market. If you can find out what the tie bar system was supposed to be for, companies who work in that area would be your best chance as suppliers.

 

[Brad93]

I've seen threads like that, but i can't for the life of me remember where

 

[Erie Fred]

Coil thread is used as above ^^ for concrete form work, as cured concrete comes off somewhat easy, when loosening the nut.

 

[dan.taylor.1]

I've seen threads like that, but i can't for the life of me remember where

Aren't some scaffold fittings that sort of thread? They seem to wind on much quicker than a metric standard thread.

 

[mtt.tr]

Aren't some scaffold fittings that sort of thread? They seem to wind on much quicker than a metric standard thread.

They are an imperial thread often

 

[Pete.]

I've seen threads like that, but i can't for the life of me remember where

Diwydag bar, or rather a variation thereof. The two raised ridges from rolling appear on some types.

 

[Pete.]

Actually, I think that's a macalloy bar in the pic.

 

[Moose McAlpine]

Aren't some scaffold fittings that sort of thread? They seem to wind on much quicker than a metric standard thread.

7/16 Whitworth i think.

 

[Moose McAlpine]

Actually, I think that's a macalloy bar in the pic.

Never heard of that stuff before, but looks like you're right.

 

[Erie Fred]

Aren't some scaffold fittings that sort of thread? They seem to wind on much quicker than a metric standard thread.

The standard scaffold jacks around here are acme thread.

 

[Pete.]

The standard scaffold jacks around here are acme thread.

Screw jacks are acme type but scaffold clips are whitworth thread, though I've seen some odd rope thread clips before.

 

[Erie Fred]

Screw jacks are acme type but scaffold clips are whitworth thread, though I've seen some odd rope thread clips before.

In the UK, I said "in my area".
Heck even your scaffolding is different than mine.

 

[Agroshield]

Actually, I think that's a macalloy bar in the pic.

I think you are correct.

Brochure here as it might help the OP identify what he has. Blind guess is 26mm nominal.

https://www.srgglobal.com.au/wp-content/uploads/2020/07/Macalloy-1030-stress-bar.pdf