Posted by Gerald J. on December 20, 2008 at 09:35:15 from (4.254.64.167):
In Reply to: Re: The Metric System posted by John B. on December 19, 2008 at 20:43:37:
Like a foreign language, there are few words few choices of pitches in the introductory standards. But there are many more metric standards. French may not match every German, and for sure every Japanese or Chinese standard. Some have 2.5mm diameter, some have 2.6. Then there are spark plug with their own vintage metric specification, ISO (the "STANDARD"), British Association (matches nothing but is handy for British watches and microscopes), Swiss watches, etc.
While we have NC, NF, NEF, 8 thread, 12 thread, 16 thread, Whitworth.
Threads around the world also vary in V angle, from 29 degrees for Acme, to 45 degrees for BA, 55 for some British specials, and we use 60.
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