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[MikeT]

Does anybody know where I can get some regulator terminal screws from. I believe they are 1/4 bsf.

[Wittsend]

Do you mean something like this ...
auction: #122857259827

Try model engineering supplies.



 

[g6anz]

if its Lucas and electrical then I would have thought them to be BA.

[Wittsend]

My money would be on 2BA, but the OP said 1/4" BSF

 

[autorover1]

They are a course thread & I believe they are 1/4 BSF as well.  I might have a duff control box which can be robbed for the screws . Will have a look tomorrow.

[Craig T]

If they are a course thread are they BSW rather than BSF?

Craig.

[g6anz]

OK so its an American site but the screws are available. As the OP said they are 1/4 BSF not BA

http://www.classicregulator.com/electronic-regulators-old/terminal-screws-14-bsf-headed#:~:text=These%20are%20the%20grub%20screws,have%20a%201.4%22%20BSF%20thread.

[Rustandoil]

Here you go...at least for 1/4 BSF

https://www.spaldingfasteners.co.uk/1-4-26-x-3-8-brass-bsf-cup-point-grub-screws/

[autorover1]

If they are a course thread are they BSW rather than BSF?

Craig.

I was thinking of course compared with BA threads

[discosport152]

More likely to be 0ba virtually the same as 1/4 b.s.From memory I think they're th same thread pitch but slightly different thread form maybe 47 degrees rather than 55.
 

[Wittsend]

We have a problem...

We need to see what the OP actually has.

A bit of research on eBay shows that over the years Lucas changed the form of the terminal screws 

And so this is a very hard question to answer without seeing the regulator in question.

[MikeT]

The regulater screws are as your last picture. The regulator is dated 8.  58

[Marky Harvey]

Are the threads on these not BSB?

[Herald1360]

BSB??? 

BSW, BSF even BSP...

Could BSB be British Standard Brass- apparently another pipe thread (though not apparently a British Standard on at all 

[Betsy1969]

British Sky Broadcasting ?