In article ,
Andy Wade wrote:
Dave Plowman (News) wrote:

And NC and NF are still common in the US.

And NPT.

Sadly unified not so in the UK as it was a far better system for
general use than metric, IMHO.

Why, OOI?

For general purpose fixings on cars UNF was the usual - and seemed to hold
rather better than standard metric. Less prone to vibrate loose.

--
*The older you get, the better you realize you were.

Dave Plowman London SW
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