Author Topic: Wot do these # mean? (Read 2679 times)

Paladin UK · « **on:** May 14, 2013, 04:13:09 AM »

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 · « **Reply #1 on:** May 14, 2013, 10:26:19 PM »

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 · « **Reply #2 on:** May 15, 2013, 10:54:34 AM »

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

Advertising · « **Reply #3 on:** **Today** at 12:17:20 AM »

Paladin UK · « **Reply #3 on:** May 15, 2013, 01:53:27 PM »

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 · « **Reply #4 on:** May 15, 2013, 05:57:33 PM »

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 · « **Reply #5 on:** May 15, 2013, 10:18:23 PM »

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

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

Coffinmaker

Chev. William · « **Reply #6 on:** September 04, 2013, 05:57:52 PM »

Quote from: Paladin UK on May 14, 2013, 04:13:09 AM

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

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