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Clinching nuts

Submitted by philip_ham on Thu, 17/03/2022
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Heavy Twins

Can anyone recommend a source for clinching nuts?  I'm refurbishing a seat pan for a 1954 Model 7 and need to replace a couple to line up with the frame mounting points.  Originally these were 5/16" BSC, but I don't expect to find these are still available!

 

Submitted by paul_standeven on Thu, 17/03/2022

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into your favourite search engine.  You will find a variety of suppliers.  Take your pick.

I am curious what you mean by 'clinching nuts'.

Submitted by peter_holland1 on Fri, 18/03/2022

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Hi Phil.

Not quite as easy as Paul suggests. You might aim for 5/16 UNF clinching nuts and after installation run a 5/16 BSC tap through which will give you what you want. Being close in TPI the form should be OK.

Peter 

 

Submitted by philip_ham on Fri, 18/03/2022

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Paul, type in clinching nuts to your search engine and have a look at these useful fasteners.

Peter, yes the UNF thread was my fallback position. 

I try to keep to one variety of spanners to reduce the number of spanners in the toolbox, but taking the seat off its brackets is unlikely to be needed on the side of the road!

Phil.

Submitted by david_cooper on Fri, 18/03/2022

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.."invented" in 1958. And patented. Another unworthy USA patent.  A nut that is riveted in place.  That is a design using established means and materials. I admire Brunel...he refused to patent anything.  It's just engineering design to meet a particular need, not an invention.

Submitted by richard_hudson1 on Fri, 18/03/2022

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We used Hank Rivet Bushes for many years with great success. Owned by TR now. Simply drill a hole, push it through and peen it over with a dome head punch. I don’t know which threads they come in, we always used metric.

Dick Hudson

Submitted by philip_ham on Sat, 19/03/2022

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Dick,

I'm learning all the time!  There seem to be several names for these fixings i.e. self clinching nuts, captive nuts and now Hank rivet bushes.  I've just done a quick search on the net and Hank Rivet Bushes comes up with a good selection, but mainly seems to be metric threads.

Philip

Hi Philip,

If they do an M8x1mm pitch it would be as near as 5/16” UNF and running a tap through we get you one less spanner in the box. It’s not as if it is a cylinder head bolt going into it.

Cheers and best of luck,

Dick

 

 

Submitted by ian_soady on Sun, 20/03/2022

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... 5/16" Cycle - 26 tpi as opposed to 25.4. UNF is 28. But of course I couldn't possibly suggest it.......

Yes Ian, I was meaning that M8 was closer than 5/16” UNF which had been suggested to be used earlier in the thread, with only 0.6 mm pitch error or about 1/2 of that over a nut length.

Cheers

Dick

Submitted by robert_tuck on Mon, 21/03/2022

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Happens to me all too often these days, going to enroll in the Met police training course at the Warren.

 


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