In article ,
Dave wrote:
15mm and 1/2" are quite close:
Half inch is near enough to 12.5 mm. 2 1/2 mm smaller than 15 mm
22mm and 3/4" ain't.
3/4 inch is near enough to 19 mm. 3 mm smaller.
Metric sizes are the outside diameter of the tube whereas imperial is the
bore. And the wall thickness of imperial tube is usually greater than
metric. In other words few could identify 15mm against 1/2" without
measuring it - but you can between 22mm and 3/4"
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*If work is so terrific, how come they have to pay you to do it?
Dave Plowman
London SW
To e-mail, change noise into sound.