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Thread: Spanner sizes
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8th December 2014, 12:42 PM #1
Spanner sizes
Still trying to organise the shed and started trying to find a home for all my spanners. I noticed some and plain imperial, others whitworth, After, and a few Whit+AF.
A 1/4 whit is about a 1/2AF.
The ones you buy now are just plain imperial are they the same as AF, just unmarked?
What would it be working on to require the whitworth spanners.
On another point but related. Is a 1/4 whitworth tap, approximately a 1/2" tap? I only knew they had a different thread. WHIT. UNF, etc.…..Live a Quiet Life & Work with your Hands
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8th December 2014, 01:03 PM #2Senior Member
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The size on whitworth spammers relates to the thread size not the across flats like a normal spanner. 1/4" whitworth still has a od of 1/4". Most stuff made in the 50's and earlier has wit worth fasteners. I'll post more later when I'm on my computer.
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8th December 2014, 01:57 PM #3
Some WW spanners have dual markings, the size of the bolt heads and nuts for WW fixings was reduced by one size during WW2 so the head of a 1/4" bolt is bigger pre-war.
A 1/4" tap is a 1/4" tap no matter if it's UNC, UNF, Whitworth etc. The WW tap will have a 55 degree threadform, the UNC/UNC (and metric) will be 60 degrees.
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8th December 2014, 02:04 PM #4
Thanks guys, The forum is such a knowledge bank!
…..Live a Quiet Life & Work with your Hands
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8th December 2014, 07:56 PM #5Senior Member
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8th December 2014, 08:19 PM #6Senior Member
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A/F Bolt head sizes
It is still happening!
19 mm A/F to 18
17 mm A/F to 16
13 mm A/F to 12
I wonder when they will start on cap screws? Metric cap screws have a larger head than the roughly equivalent imperial ones (1/4"-6 mm; 5/16"-8 mm; 3/8"-10 mm) so this is an easy way to quickly identify them.
Mm.
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8th December 2014, 08:24 PM #7Pink 10EE owner
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That is just the difference between JIS and DIN and ISO..
You buy a japanese devise and it had bolts with 12mm heads, you buy some spares in AU and they will have 13mm heads... And metric was supposed to be standardised..
There is nothing more annoying, repairing something, you are in some god forsaken position to get a last bolt out, every bolt you pulled out had a 12mm head.. You are feeling around with the socket wondering why it is not going on... Yes someone replaced it with a 13mm headed bolt...Light red, the colour of choice for the discerning man.
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8th December 2014, 09:04 PM #8
And the reason the Asia market don't use 13mm heads.
Is because it's bad luck the number 13 that is
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8th December 2014, 10:04 PM #9future machinist
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As has been said before there are two Whitworths so you need two different set of spanners and another for Imperial
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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8th December 2014, 10:07 PM #10Senior Member
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The bodger's guide to spanner sizes.
http://www.scribd.com/doc/226985798/Spanner-Size-Chart
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8th December 2014, 11:07 PM #11Pink 10EE owner
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Just buy a set of shifters.... If you round any heads off with them, buy a set of stillsons...
Light red, the colour of choice for the discerning man.
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8th December 2014, 11:23 PM #12SENIOR MEMBER
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Except pipe threads, e.g. BSPP 1/4 (Aka G1/4) is a touch over 13mm (http://www.ring-plug-thread-gages.co...read-data.html)
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8th December 2014, 11:32 PM #13
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8th December 2014, 11:48 PM #14
And then you get the bastardised standards, my long gone and
largelycompletely unlamented Morris had bolts in the engine that had metric threads but Whitworth sized heads, I was told that the tooling in use in the factory at the time came from France, hence the metric threads.
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9th December 2014, 06:43 AM #15
My old (1954) Land Rover uses Whitworth sizes, I've got a set of old spanners and sockets. By enlarge, as a rule of thumb there is one size different between imperial and Whitworth. For example, if you look at something and think its a 1/8th then you'd need a 1/4 Whitworth to a compadre the bigger head.
As for Asian metric bolts and sockets, well they just do my head in. Growing up in Europe with ISO standard metric constantly sees me reaching for something that's 1mm too small. Grrrrrr
Thx
Jon