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Smiths MA Speedo - fixing nut thread?

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Smiths MA Speedo - fixing nut thread?
Chris KC Offline
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#1
28-07-2024, 04:38 PM (This post was last modified: 28-07-2024, 04:38 PM by Chris KC.)
Self explanatory I hope - hoping to fit an MA speedo but one nut is missing - anyone know what thread it is?

M4 perhaps?

I've exhausted the odds & sods box and found nothing which will go on properly; Google likewise unhelpful.
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Robert Leigh Offline
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#2
28-07-2024, 06:05 PM
Looks like 4BA to me.
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Chris KC Offline
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#3
28-07-2024, 06:52 PM
Thanks Robert.

I did confirm that is isn't M4 - haven't any 4BA's to try but at least now I know what to look for - Google awaits...
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Chris KC Offline
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#4
05-08-2024, 11:03 AM
Just thought I'd leave the result here for anyone who comes looking later...

Ordered some 4BA brass terminal nuts which are beautiful - but too small.
Tried 5/32 BSW, about the right size but the pitch was wrong.
Got out an even bigger magnifying glass and my best eyes, and re-counted the threads - 3BA?
Arrived this morning and they fit!

The ones I bought are light aluminium and don't seem very robust or pretty. 
I think I just might acquire a 3BA tap and run it through those lovely 4BA brass terminal nuts.
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Jeff Taylor Online
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#5
05-08-2024, 12:14 PM
3BA Full Brass Nuts but not terminal nuts are available here:

https://www.ba-bolts.co.uk/brassnut.html
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Chris KC Offline
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#6
05-08-2024, 12:24 PM
Thanks Jeff but I rather like the knurly ones.
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Robert Leigh Offline
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#7
06-08-2024, 10:08 AM
Sorry I got the BA size wrong; I'm a bit rusty on BA having not used it since the sixties.
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Chris KC Offline
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#8
06-08-2024, 12:17 PM
No problem Robert, as always any help is appreciated. 
I do better on the bigger threads but I struggle to count tpi these days when it's 30+!
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