"CWLee" wrote in message
...

Can anyone here point me toward an authoritative history of
hex head nuts and bolts? I see square nuts and bolts in old
machinery and tools in museums, but I don't think I've seen
a hex head nut or bolt in anything built before 1900. Does
anyone know who invented/developed the hex head nuts and
bolts? When, where, why, etc? Any info on this topic
appreciated.

Probably Sir Joseph Whitworth - he standardised the threads used in screws
and bolts in 1841 and must have standardised the heads as well. There was a
TV program about him recently here in the UK.

Leon
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Leon Heller, G1HSM
http://www.geocities.com/leon_heller