I believe I'm safe in saying, that UNF, SAE and ISO thread profile
dimensions are the same. There are thread tolerance classes and coatings that
effect the fit between nuts, bolts dies and taps.
Whitworth Threads
Rootes used Whitworth BSF and BA fasteners in its vehicles almost
exclusively through the mid-50's. Tiger owners are lucky that they fazed out
most
of the Whitworth threads by the time Tigers were built, although some exist.
Spouses, partners and playmates of those who have purchased older vintage
British-made cars often believe that b Whitworth threadsb is code for
b You
had a screw loose the day you bought that thingb .
.John Logan
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