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Ralph Mowery

In article ,
says...

I think it depends on the grade. If I buy SYP it is usually the
nominal 1.5x3.5 or pretty close but some of those white wood "promo"
studs you see on the end cap at the BORG for about ~$3 a piece are
more like 35mmx85mm or something and about 1/8" smaller than nominal.
Plywood is really the one that was hurt by metric measurements since
it is the next nominal metric under the inch size. The one that is
"almost" 1/2" is really 12mm or at least that is the router bit that
cuts the right dado.

It was close to 40 years ago I bought some 2x4s at a Lowes store.
Found some nails that would not go through 2 of them. Moves to another
house almost 35 years later and was going to build some shelves. When I
drove the nails into two of them stacked on top of each other, the nails
penetrted about 1/16 of an inch or so. It may have something to do with
the milimeters and inches.

I thought those 8 ft ( really what is it, maybe 92 inches) long were
being cut down a small ammount because some other lumber deminsions were
changed.