Where can I get a 3/6" CEI tap ?

[Ixion]

Used on the old pom telephone exchange gear too - quite a coarse thread from memory!

From mid to late 60's the poms started 'unifing' the threads on british bikes but you are right - it can be a nightmare! 'Cycle' threads were not that common though but used in wierd places. I had a mare getting a replacement clutch hub nut for an old AJS once because of the 26 tpi thing. Solved with a nut from the old mans box of bits

Oh yes. I left out the BEEI thread (british Electrical Engineering Institute) . They had their own too - sometimes just called BE, or BSE. And the British Post Office had a special one of their own. And then there's India. Which had a whole RAFT of special cases.

And then as Mr Paul said, some twit decided that they needed to "unify" things, which just introduced MORE complication.

[ManDownUnder]

... same as BSF, but finer thread and a different thread angle.

LMAO - so it's the same as BSF... except the pitch and thread angle are different... so it's not the same at all then... not even a little bit...

Sorry dude - I can't help with the tap (oh and you might want to specify if it's a taper, intermediate or plug... just to help the good folks along)

[Ixion]

Plug. was in the original post.

[roadracingoldfart]

Trade Tools Ltd may be able to assist you but if you only need to borrow a tap then find either a modelling nutter or a printing machine mechanic as the bloody pomms used the thread in some press applications.

Good luck looking in Auck but i have a few contacts here in Welly that i know have got them including myself and due to the rarety of them i a sorry i wont lend them out .
I have been a fastening specialist for many companies over the years selling and doing application consulting and go rite back to the days of "Winwood Screws And Fasteners " in the very early 80s so i have just collected crap as ive come across it and at auctions etc for years .
One day i might even use some of them lol.
Its soooo good to see there are some old buggas around that still remember the good old days of other than Metric.
All the best in the search , Paul.