> Are British fine thread bolts different in thread form or
> pitch from AN or SAE bolts?
Yes, both pitch and thread form are different for BSF vs UNF. 3/8" BSF is
20 tpi, while 3/8" UNF is 24 tpi.
BSW typically has the same pitch as UNC (except for 1/2"), but still
different thread form.
My guess is that there is a slight difference between the AN and SAE
hardware, perhaps in the class of thread fit or something like that.
Randall
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