On Tue, 23 Nov 1999, Jim Davis wrote:
> exclusively on TR6's. UNC is course thread, and rarely used on the TR6.
> As for the others, I don't know, however hopefully someone with more
> hardware knowledge than me will inform us.
BSP = British Standard Pipe
BSW = British Standard Whitworth (I think)
TPI = Threads Per Inch (ie. 1/4-UNF28 means 1/4 piece of metal carved down
to 1/4UNF spec, or 28 TPI) 1/4UNC is 20TPI. OK?
NPT = National (?) pipe thread - a tapered pipe thread only slightly
different than BSP.
Whitworth wrenches are handy to have- SU carbs use them almost exclusively
(luckily the nuts that hold them on are undoable with ye standard 'alf
inch wrench). Also, the captured nuts on my TR4 are 1/4 whitworth, which
are bigger than 1/4UNF (eg 7/16" wrench does not fit) - when you bust one
of the captured nuts off it is always nicer (and far more civilised) to
get a wrench on the broken part and undo it proper. (The heater bolts
come to mind... no way could I have got vise-grips on the chunk o' steel
left somewhere in the scuttle)
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