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Help with identifying a type of threaded rod.


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#1 raynkar

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Posted 08 April 2021 - 10:10 AM

I want to buy some part threaded rod like the one in the pic below, but don’t know what it is called :)

 

It’s basically a rod used as part of a ‘hold down’ clamp, the threaded section has an M8 thread at 7.75mm diameter, and the non threaded section is basically 7mm rod at 6.98-6.99mm

 

This is obviously different to a normal part threaded bolt where the non threaded part is shouldered to be the same diameter as the threaded section. I could make my own by filing part of the thread off a bolt but would prefer to be able to just buy some ready made.

 

9F5E69A2-474E-40BF-BBBF-E123F1C2B7CA.jpeg


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#2 ST56

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Posted 08 April 2021 - 12:01 PM

Hi

 

That appears to be 7mm bar with an M8 thread rolled onto the end. This is often done on items like wire wheel spokes and gives a much stronger thread than one cut into the bar. This would be a process for an old fashioned machine shop that have a specific machine for the job.

 

Presumably having a fully threaded bar will interfere at other end because grinding thread to 7mm dia will still leave root of thread.

 

This is the sort of item I often spend hours searching eBay for in hope. Trying all combinations of words to describe in the vain hope of lucking out. Occasionally finding something that will work but at an obscene high price.

 

Peter


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#3 raynkar

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Posted 08 April 2021 - 12:24 PM

Hi
 
That appears to be 7mm bar with an M8 thread rolled onto the end. This is often done on items like wire wheel spokes and gives a much stronger thread than one cut into the bar. This would be a process for an old fashioned machine shop that have a specific machine for the job.
 
Presumably having a fully threaded bar will interfere at other end because grinding thread to 7mm dia will still leave root of thread.
 
This is the sort of item I often spend hours searching eBay for in hope. Trying all combinations of words to describe in the vain hope of lucking out. Occasionally finding something that will work but at an obscene high price.
 
Peter


The expensive situation is just as you describe :)

Hold down clamps are easy to buy, but that would mean often paying £15-16 a go just to get a 10cm length of part threaded rod.
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#4 ST56

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Posted 08 April 2021 - 03:28 PM

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Hi

This any good: https://www.ebay.co....iIAAOSwOVpXThBp

 

Must it be 7mm at plain end.

 

Peter


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#5 raynkar

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Posted 08 April 2021 - 04:55 PM

Hi

This any good: https://www.ebay.co....iIAAOSwOVpXThBp

 

Must it be 7mm at plain end.

 

Peter

Annoyingly the plain ends have to be 7mm, otherwise it would be easy and cheap to just buy grade 8.8 bolts.


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#6 raynkar

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Posted 08 April 2021 - 05:01 PM

The rods are for hold down clamps like these. The holes in the clamp the plain end of rod goes through are 7mm.

I could drill out the holes to make the diameter 8mm, but the clamps are cast ‘sh1t metal’ to use the common name, and the holes are already pretty fragile.

 

2275AD40-C45E-4BFC-9027-8AB8427C7328.jpeg


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#7 PURPLE_2L_LX

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Posted 08 April 2021 - 07:38 PM

How many do you need and what material?

 

Just round or would a slight flat on one or more sides be useful?


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#8 raynkar

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Posted 08 April 2021 - 09:55 PM

How many do you need and what material?

 

Just round or would a slight flat on one or more sides be useful?

 

Not sure yet, maybe two or three. 

I’m tempted to just put some bolts in my pillar drill and filing off the thread :)


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#9 PURPLE_2L_LX

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Posted 09 April 2021 - 12:21 AM

What are they for?  Chopsaw?

 

Just wondering how much pressure is on the bar, threads tight or loose?


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#10 raynkar

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Posted 09 April 2021 - 07:57 AM

What are they for?  Chopsaw?

 

Just wondering how much pressure is on the bar, threads tight or loose?

 

I have a fair amount of spare MDF and wood surplus from various projects at the moment, so might make some jigs or different saw sleds, the clamps would be for those. Whatever I make might only get used infrequently, so I could mix and match the clamps.

 

The threaded parts are only ever hand tight, and the force of the screwed down part stops the whole thing moving.

The ones in the pic are from a mitre saw, but as long as I stick with M8 threaded sections I can swap them from tool to tool.


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