On 12/5/2018 3:06 PM, 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.



Actually, 49 years.
However, it wasn't until 1969 that the U.S. Department of Commerce once
and for all unified lumber sizes across the country. So, the once
full-sized 2x4 was reduced to today's 1-1/2� x 3-1/2� through a
combination of drying, machining, as well as unifying the wide variety
of species used to make the ubiquitous 2x4.

Going back before that, I remember using some that were 3 5/8 x 1 5/8.
That was about 55 years ago.