> It's actually more complicated than that, though. The bolts that we
> call "Whitworth" on our LBCs aren't really. They're British Standard
> Whitworth (BSW), or British Standard Fine (BSF).
Except the ones that are British Association (which on a TR3 is the majority
of the "Whitworth" threads).
> So a 1/4-20 whitworth bolt has a head that you'd
> find on a 5/16 BSW or BSF bolt,
Are you sure about that ? My understanding is that a 1/4 BSW bolt has a
larger head than a 1/4 BSF bolt.
IOW, BSW is effectively the same as the earlier "Whitworth" (in much the
same way as UNC is the same as NC).
See, for example,
http://www.internationalcockpitclub.org.uk/articles/article_threads.htm
Randall
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