Ed:
Au contraire, mon ami.
SAE uses a 60 degree thread angle
Whitworth, British Standard Fine, British Standard Coarse and
other British standards (collectively called "Imperial") use a 55 degree
thread angle. The exception was the BSC (British standard Cycle - used
exclusively on Motorcycles and bicycles) used the 60 degree angle.
There are some other minor differences. Imperial threads have
rounded crowns, while SAE have flat crowns.
The most important specifications, thread pitch, major and minor
diameters are identical since the US effectively followed the British
standards through history except as noted.
Later, the standards converged to UNC and UNF (called unified
for rather obvious reasons) to universally use the 60 degree thread
angle.
Check Wikipedia. Don't take my word for it. Wikipedia refers to
the various British standards as "Imperial" standards - so I am not
making this up. To see the differences in construction, look here:
http://www.britishfasteners.com/threads/unf.html
click on the links at the top of the page to see the
specifications for the various fasteners. Note that BSF does not equal
UNF although the differences are slight.
I don't think any of this changes the bottom line - the British
fasteners are fully compatible with the SAE (More properly called ASME
these days as I recall - American Society of Mechanical Engineers) that
you will find in the corner hardware stores.
It all gets very messy as standards changed. Makes my head spin
just thinking about it, kinda like Linda Blair in "The Exorcist" =:-o
Cheers,
Vance
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Shop at " Just Brits "
Sent: Saturday, October 09, 2010 5:36 PM
Cc: 'MG List'
Subject: Re: [Mgs] rocker threads causing problems
<< 'nuff said. <evil grin> >>
'fraid not, Vance. Just too much
mis-information to the masses.
HTHs & I am pretty sure Gordie know most of above
<VBG> !!!
Ed
'67 BJ-7
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