On Wed, 5 Dec 2018 12:06:51 -0800 (PST), trader_4
wrote:

On Wednesday, December 5, 2018 at 10:27:01 AM UTC-5, Ralph Mowery wrote:
In article , "frank says...

Learned this yesterday. What I measured as one inch pipe was actually
3/4 inch.

https://www.pvcfittingsonline.com/re...e-pvc-is-this/



It has always puzzled me as to why almost nothing in the building trade
measures what the 'noninal' size is.

What really makes me mad is that common items such as a 2x4 keeps
getting smaller. When you have to make a repair on older buildings you
often have to buy several smaller items to make up the required
thickness.

IDK what 2x4's you're buying that keep getting smaller, but the ones I've
been buying have been the same size for 50 years. Ice cream containers,
chocolate bars and such, sure, I see the packaged size change on those,
but not 2x4s.


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.