Wot do these # mean?

[Paladin UK]

Ho Pards..

Gotta confooozed Puk here  .......
I bought a mixed load of BA taps and dies no probs with any apart from one tap

Its maker is TOGA (Brit) and its size is N^o C     BA Standard

Do any pards know what normal BA tap this is equivalent too? it looks awful close to a `0`  BA

Paladin (What needs ta know ) UK

[Hedley Lamarr]

There is no BA "C" size.
I'd bet that it is a worn 0 (naught).

http://en.wikipedia.org/wiki/British_Association_screw_threads

[Coffinmaker]

PUK

Ah ........... Perhaps ..... ah less than a #1

Or even .... Oh never mind.  Don't have a clue.  I do have a set of old Whitworth wrenches though  

Coffinmaker

[Paladin UK]

Well thanks fer yer info pards
I know that` BA` stands for `British Association`
Here are a couple of piccies and as far as I can see it Still looks like a `C`

Paladin (What aint none the wiser  ) UK

[Blackfoot]

If it is BA it will not be equivalent to anything that is SAE, NC, NF or metric, might be handy some time if you need an interference fit on a threaded  work piece.

Blackfoot

[Coffinmaker]

Well OK!!  A picture is worth a thousand words.

I can tell you with ABSOLUTE certainty ....... Nada Clue 

Coffinmaker

[Chev. William]

Ho Pards..

Gotta confooozed Puk here  .......
I bought a mixed load of BA taps and dies no probs with any apart from one tap

Its maker is TOGA (Brit) and its size is N^o C     BA Standard

Do any pards know what normal BA tap this is equivalent too? it looks awful close to a `0`  BA

Paladin (What needs ta know ) UK

I hope this helps a little on identifying your BA Tap:
"Machinery's Handbook" or "Machinist's Handbook" has been published in the USA since before WW1 and is a Wealth of machining information.  They have numerous tables of screws, threads, and Tap & Die dimensions covering the whole gamut of thread systems world wide.  If you can find a copy in a Library there in UK it should give you the information to identify your tap in the proper scheme of B.A. threads.
There is a steady progression of information as the standards change so earlyier copies have some information no tin later copies.
Example: During the Two World Wars, thread forms and their usage were 'standardized', first in Aviation related fasteners, then for WW2 the 'Unified' system was imposed to make threaded fasteners interchangeably among the allies. a number of useful threads and forms were relegated to the 'obsolete for new design' lists and eventually their data were dropped from publication.
Best Regards,
Chev. William