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Whitworth 101:
I think Snap-On still has some available. if not,
try the websites especially in the UK of the old british
sports car guys.
BTW:
"Whitworth" refers to several schemes"
"BSW"= British Standard Whitworth.
This is a coarse thread equivalent to SAE, but
not interchangable because BSW takes a 55 degree
thread profile rather thatn the american 60 degree.
Used mostly for steel into aluminum and low
precison applications like case screws and through
bolts.
"BSF" =British Standard Fine
This is fine thread like SAE fine. Used mostly for steel to
steel precision and high strength parts like rod bolts.
"BSP" = British Standard Pipe
Just like american standard pipe this is a tapered
thread, used on bikes mostly for fuel and oil fittings.
NB. The size of a Whitworth wrench is the size of the
nut or bolt head whch matches that bold or stud size.
For instance, a 1/4" Whitworth wrench is NOT 1/4"
across the jaws or the hex. Rather, it is the size of
NUT that fits on a 1/4" BSW or BSF bolt. This is the
same size as the hex head on that same bolt.
Ditto for all of the other sizes:
A 1/2" Whitworth wrench fits on the head of or on the
nut that fits a 1/2" BSW or BSF bold.
The same hex sizes are used for tapered fuel fittings
where the conical fitting is hald together by a com-
pression nut that thightens down on a BSP thread
spigot.
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