Ian Rae
From:
Redditch, England
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Posted 20 Feb 2018 2:17 pm |
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This may be of interest to Excel owners. I shortened the legs on mine and when it was time to knock the spigots back in I looked around for a couple of nuts to protect the thread from the hammer. I assumed that as everything else on the instrument is metric, I would need M12s. Not so. So I wondered if Mr Fujii was bowing to American tradition and using 1/2 x 13. Not that either. Turns out they're ½" BSW (Whitworth) which are actually 1/2 x 12.
Wikipedia says:-
American Unified Coarse was originally based on almost the same Imperial fractions [as BSW]. From ​1â„4 in up to ​1 1â„2 in, thread pitch is the same in both systems except that the thread pitch for the ​1â„2 in bolt is 12 threads per inch (tpi) in BSW versus 13 tpi in the UNC.
So it looks as though Japan still recognises the original standard without the modern exception.
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Make sleeping dogs tell the truth!
Homebuilt keyless U12 7x5, Excel keyless U12 8x8, Williams keyless U12 7x8, Telonics rack and 15" cabs |
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