On 12/05/2018 10:09 AM, Frank wrote:
On 12/5/2018 10:11 AM, rbowman wrote:
On 12/05/2018 06:55 AM, Frank wrote:
Learned this yesterday. What I measured as one inch pipe was actually
3/4 inch.

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

https://www.engineeringtoolbox.com/a...pes-d_305.html

Same as black iron or steel, unless you get into the copper sizing
variations:

https://www.sizes.com/materials/pipeCopper.htm

Whenever possible I bring a sample of what I'm working with me when
buying plumbing stuff.

That is something I should have done yesterday. All I wanted was a
coupling and figured it was one inch since that was the pipe diameter.
I should have taken my micrometer or a piece of the pipe to the store.

I don't know if they have them for pipe but the local Ace has sizers
like these hanging in the fasteners section:

http://boltsizeit.com/

These days I approach unknown fasteners with suspicion. Is that really a
6-48 or some sort of metric thing? Life was simpler back in the day
when the only oddballs was the Whitworth stuff on Brit iron.