Hi, I'd be grateful for some advice on where to source imperial sized countersunk and socket head screws to replace some rather worn ones on my v old Smart & Brown Model M Mk 1. If I could confidently state what size they are I know that would help, but that too is proving difficult. The smallest is about 5/32 and probably 32 tpi.

Grateful for your thoughts.

Gentlemen, thank you all for the prompt responses, I have been Googling for Britain with only very limited success. I think I'm going to have to very carefully measure the screws (there is more than one type) and post that info – cant do it at the moment as away from home.

Also, I want to get exactly the right threads as a number need holes retapped as they've not been loved and for some the thread has almost been obliterated – I'm hoping I can identify the thread from the relevant screw and work from there.

I'll have a look at the companies suggested and see what I can achieve.

Have a great Christmas.

Martin, to my shame I do have a tpi thread gauge but the results seem inconclusive! i'm going to spend more time at the bench and carefully assess the tpi and my use of the guage (maybe the ones I have are a bit cheap!).

Bazyle, what a thought – I shall see if I can find any in the loft!!!

Gentlemen,

Delighted to have started such an enthusiastic debate !

I have now had a closer look at two screws in particular (thanks Hopper for making me look through other old stuff from my father – a magnifier was found!). The results are as follows:

Baseplate retaining screws: 32tpi with a measured major diameter of 0.1825". The thread gauge actually reads 32G5/32, but 5/32 is too small!

The countersunk screws appear to be 4BA, with what appears to be almost exactly 38tpi and 0.134" max dia.

It is worth remembering that most of these screws/holes are worn so measured sizes are unlikely to match the 'as designed' specs.

Does this help you to help me?

Regards