1920's Atco Standard 16" restoration.
All the nuts on this machine appear to be oversize BSW. For example the 1/2" BSW has an Across Flats of 1" compared to the standard 0.82" (13/16"). The same applies to all the other sizes. I want to replace all the nuts with new, is there anywhere these larger sizes can be purchased ?
Good question although the answer may be trickier! I think you're right about the sizes but that means that it's unlikely that anyone will have new replacements from stock. A good place to try is Jon Cruse at The Mower Centre in Hailsham as he can often supply obsolete parts.
Failing that the alternative is to strip a derelict machine for the parts you need.
Not sure about the old style nuts but there is no harm in asking around a few nut and bolt suppliers, I have never needed to try them out personally but this looks to be a useful company to try.
Failing that making your own may be an option or enlisting the help of a friend with lathe.
Good luck with the search.
Thanks but no luck anywhere. On the existing larger 1/2" BSW nuts I have today been stripping them back to bare metal then polishing and lacquering-they're now better than new! However this was very tedious as they will have to be brush lacqued again after fixing. The smaller sizes will be replaced with new as the Across Flats difference is minimal.
As an aside to my original question on all the restored machines I've seen the nuts and bolts have been painted over the same as the frame colour. I stand corrected but I would guess this was highly unlikely during assembly when new. As I'm striving for originality all the fasteners will be bare metal.
Cleaning up the old nuts is probably the most logical answer but I am not at all sure about them being lacquered. I think most machines would have had them painted along with the rest of the machine. Hopefully if I am incorrect it will prompt a comment or two from other readers
Even if there is some pitting to a nut after cleaning and treating to halt the corrosion it is all part of the machines history unless of course the amount of wastage of the metal is so great that the nut is unusable.
I would be more than happy to produce any nuts you require - any size, any shape just let me know what you need.
I read yesterday that during the war they reduced the hex size of all BSW by one step to save on material. Therefore there is a difference between pre-war and post-war spanner sizes. The step size was to retain the same set of spanners.
From the front page of this website
"B.S.W. or Whitworth
I have a large framed blow-up of this period advertisement and the nuts do not appear to be painted.
I don't intend to paint the nuts on my Standard.
@DB: Thank you for that historical info on BSW nuts.