For what it's worth, Whitworth threads did vary the
pitch depending upon the bolt size. They were the
world's first properly defined thread, and the
standard British 'coarse' thread for over 100 years.
BSF (British Standard Fine) was the fine version, and
BA (British Association) was for small screws. There
were (are) a myriad of others - BSP (pipe), gas and so
on and so forth.
Some British cars of the seventies used metric,
'unified' (US) and traditional UK threads on the same
vehicle. That may or may not have had some bearing on
what happened to the British car industry... Some
current US vehicles mix US and metric threads...
Germany has its own range of 'PG' threads which are
metric but not to ISO standards...
The sooner that the whole world adopts ISO metric
threads for all non-specialist purposes the better!
73 Roger
VE3ZI
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