Re: [AMC-list] I had to send it (Whitworth sockets)

[Ken Ames <ameskg@xxxxxxxxx>]

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

Ken 


Quoting Frank Swygert <farna@xxxxxxx>:

> I had to look it up, then got confused when they looked the same as normal
> sockets, even the sizes!! So I checked Wikipedia to discover the difference.
> So Whitworths can be used with regular bolts and nuts for the most part, but
> the size markings are screwy! The sockets are marked by bolt diameter, not by
> the distance between the flats. A 1/4" bolt uses a 1/4" Whitworth socket, not
> a 7/16" socket (size of the typical head), even if the Whitworth bolt head is
> 7/16" too (which it may not be -- don't know the standard for making the
> heads!). Thread pitch is different from standard US and metric bolts too, so
> if you have Whitworth standard bolts you have to have Whitworth standard nuts
> or threaded holes. 
> 
> According to this chart (http://www.sat.dundee.ac.uk/~psc/spanner_jaw.html --
> scroll down near bottom for chart) the Whitworth heads correspond to nothing
> in US (AF -- across flats) or metric heads, but then metric and US don't
> match perfectly either. There are a couple that I know are "close enough to
> work" -- i.e. 13mm is 0.012" bigger than  1/2" US), and a few Whitworth are
> close enough (within 0.020") for either a metric or US standard, but figuring
> out which ones would be a nightmare!! I didn't know Mets used Whitworth
> fasteners...
> 
> 
> ------------
> also occurred to me to wonder how many folks these days have any idea
> what the **** 'whitworth sockets' are...  though i'm sure any met
> owners here do!
> ________________________________________________________________________
> Andrew Hay        
> 
> -- 
> Frank Swygert
> Publisher, "American Motors Cars" 
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
> 
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> 


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