I wouldn't imagine that you have any british fine thread on your car.
Almost everything, sans some brake hardware, i sprobably unified national
thread size, either coarse (unlikely in a triumph), fine (most common) or
extra fine ( found in a couple of places). These are the UNC, UNF, and
UNEF suffixes. Look in the phone book under fasteners, there are probably
three or four stores that are fastener stores that will have almost
anything you need. Some of the things that are used on the cars are a
little odd, like studs with fine thread on both ends, because most
engineering standards are to use coarse thread into a casting. The easy
way to tell if something is Bristish Standard Whitworth (BSW) or British
Standard Fine (BSF) is if there is a prominent radius on the thread.
UN-series threads lack this radius.
hope this helps
On Tue, 29 Dec 1998 MPRICE@KeystoneSystems.com wrote:
> I'm sure this thread has come and gone a few times prior to my joining
> the list. If so, my humble appologies. None-the-less, I need to get some
> questions asked. I'm working on a '68 TR250, so bolt heads and nuts all
> seem to be pretty much SAE sizes. I haven't found any Whitworth (sp?)
> fasteners. (are there any on this car?)
> 1) I understand that the threads on these fasteners are a british fine
> thread or something like that. Is this the same as National Fine Threads
> we see here in the US?
> 2)I've seen many letter combinations thrown around, and other than Pipe
> Threads (NPT?), and Standard (NST?), I haven't a clue as to what they
> all are. For the fasteners on my car, what am I looking for? BFT?
> 3)Is there a readily available source for these fasteners other than the
> big 3? I can't imagine that my local Ace Hardware stocks these, and I
> don't know all the sizes I'm going to need. ("Yup, gonna need 4 just
> like this old rusty one here.")
> 4)Taps and Dies for these? Where is a good source for these?
> I appreciate any information from the list.
> TIA folks.
> 68 TR250's (In need of things to attach parts to the cars with)