Sorry ! Guess I added a bunch to the confusion...
Yes I DID mean to say a 1/2" Whitworth wrench fits a bolt or screw of 1/2"
diameter, as opposed to one with a 1/2" head. And of course Whitworth (and
BSF, BA, etc.) are standards. And yes, BSW and BSF use different head sizes
for the same nominal diameter fasteners - in fact BSW/BSF wrenches (at least
mine) are actually marked with the different BSF and BSW sizes they fit, as
with the examples Randall, Graham, etc. gave.
What I meant by non-standard is what you often see in ANY thread system - an
unusually large or small head on a bolt or screw. For instance, (referring to
US sizes here) you expect a 3/8" bolt to have a 9/16" head, but sometimes
(specialty fasteners, etc.) you find the head is larger or smaller and
requires a different wrench size.
OK - I'll shut up and go back to work ;-)
Karl Vacek
'66 TR4A
'68 TR250
'64 Amphicar
'16 Ford Model T
'46 Piper J-3 Cub
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