Why is the outer diameter of 1 inch galvanized pipe 33.7? And the outer diameter of one inch stainless steel pipe is 25.4
The 1 inch galvanized pipe refers to the nominal size holes of 1 inches of water, the outer diameter is 33.7, its diameter fits a 1 inch pipe thread wire, and one inch stainless steel tube outer diameter is 25.4 that of the tube is in diameter standard specifications.
Some 25.4 such outer threads, is the imperial Whitworth Thread and American Standard unified thread, single head wire estimate.
