Karl Vacek wrote:
>
> But who'd ever expect anything non-standard on a British car???
Well, to be fair, Whitworth _is_ a standard, just a very old one that
didn't age very well. Before Whitworth, there was no standardization of
fasteners or wrenches. Can you imagine having to _make_ a new bolt
every time an old one was damaged ? Sir Whitworth's insight into the
advantages of standardization was a key part of Britain's early success
as an industrial nation.
> Whitworth wrench sizes correspond to the nominal diameter of the fastener -
> ie, a 1/2" wrench fits the head of a standard BSF or BSW screw or bolt.
I think what Karl was trying to say is that a 1/2" Whitworth wrench fits
the head of a 1/2" Whitworth bolt or nut, even though the head (and of
course the wrench opening) is much larger. Of course, there's a twist,
BSF uses a smaller head for the same thread diameter than BSW. So, a
1/2" Whitworth wrench fits a 1/2" BSW, but a 9/16" BSF. On top of that,
I don't know of _any_ BSW (the original Whitworth standard) fasteners on
a TR3. There are a few BSF, but most of the oddball thread fasteners
are BA (British Association) ! In addition, a very few are metric, and
some don't appear in any of my thread manuals !
Randall
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