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From: shazzbat on 27 Dec 2006 16:10

"Chris Whelan" <cawhelan(a)prejudicentlworld.com> wrote in message
news:uZqkh.15091$v4.8529(a)newsfe3-win.ntli.net...
> shazzbat wrote:
>
>> And I think you may find that it is equal to the bolt size, ie a spanner
>> marked 1/2" B.S will fit the British standard head of a 1/2" bolt.
>>
>> For instance, one of the longest remaining common applications was the
>> use
>> of a 1/4"W spanner for battery terminals. The spanner would be
>> marked1/4"Whit/ 5/16" B.S, and it would fit the 5/16" bolt through the
>> battery terminal.
>
> During the war...
>
And up to the seventies, according to this guy.
http://www.enginehistory.org/british_fasteners.htm

I know when I worked on Land rovers and other assorted army trucks in the
seventies, they were a splendid assortment of BSF/BSW and UNF/UNC.

And it continues. The 1985 Ford Cargo I owned until recently had ISO metric
fasteners for the chassis and cab, but (mostly) UNF/UNC on the major
assemblies.

Steve




From: shazzbat on 27 Dec 2006 16:18

"SimonJ" <me(a)mine.net> wrote in message
news:IKGdnUchWPQDXA_YRVnyswA(a)bt.com...
>>>> But don't get me started on the older ones which had both Whitworth and
>>>> BS sizes on them. (BS = Bolt Size).
>>>>
>>> I think you may find that BS actually stands for British Standards.
>>
>> And I think you may find that it is equal to the bolt size, ie a spanner
>> marked 1/2" B.S will fit the British standard head of a 1/2" bolt.
>>
> But it wont fit a 1/2 inch UNC bolt,

True, but then the Americans never bother themselves overmuch with Brit
conventions.

or a 1/2 inch whitworth bolt, even
> though the 'bolt size' on both those is 1/2 inch.

Actually it will fit a 1/2" (stem) bolt with a whitworth thread, which will
have a 7/16"W hex head. The spanner will be marked 7/16"W/1/2"BS This is not
correctly a 1/2" W bolt of course, but it all adds to the fun.

But we've drifted from my point now which was to point out the potential
confusion caused by the dual markings. I was using = to signify "is equal
to" rather than "stands for"

Steve



From: SimonJ on 27 Dec 2006 20:00
>>>>> But don't get me started on the older ones which had both Whitworth
>>>>> and BS sizes on them. (BS = Bolt Size).
>>>>>
>>>> I think you may find that BS actually stands for British Standards.
>>>
>>> And I think you may find that it is equal to the bolt size, ie a spanner
>>> marked 1/2" B.S will fit the British standard head of a 1/2" bolt.
>>>
>> But it wont fit a 1/2 inch UNC bolt,
>
> True, but then the Americans never bother themselves overmuch with Brit
> conventions.
>
> or a 1/2 inch whitworth bolt, even
>> though the 'bolt size' on both those is 1/2 inch.
>
> Actually it will fit a 1/2" (stem) bolt with a whitworth thread, which
> will have a 7/16"W hex head. The spanner will be marked 7/16"W/1/2"BS This
> is not correctly a 1/2" W bolt of course, but it all adds to the fun.
>
> But we've drifted from my point now which was to point out the potential
> confusion caused by the dual markings. I was using = to signify "is equal
> to" rather than "stands for"
>
But that's the whole point, it isn't equal to the 'bolt size', unless it is
a British standard bolt. Hence the mark 'BS' to indicate that they are
referring to British standard bolts. The confusion only arises if people
don't understand what the markings mean, which is why I pointed it out.


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