Posted by phil_n on March 08, 2015 at 14:23:20 from (207.81.66.16):
In Reply to: No metric wrenches? posted by Notjustair on March 08, 2015 at 07:43:49:
When I worked in England we had three different metric threads to deal with - British, European, and Japanese. They often had different thread pitches but the threads were also different shapes - pointed or rounded on the end (the root). So even if you got the same diameter and pitch they might still not work if you tried to put a bolt with the pointed root into a nut with the flat root. But it would work the other way around.
Then of course there was always Whitworth, British Standard (BS), Imperial, and US.
If you needed to match a bolt to a nut you had to take one or the other with you to the industrial suppliers or you might spend the whole day going back and forth until you got the right one.
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