Eric,

Your note strikes me as a cornucopia of useful info!

Many Porch members are no doubt surprised to hear that the ASME standard for a
#10 thread was #10-30 as late as 1916.  “Kent’s” is an authoritative reference.

( Might add that the “Numbered” screw sizes went up to #30. In our time, we
don’t see anything larger than #12 except when working on antiques. )

Thanks for “the word” on M-F screw thread profiles.

Your “Bamboo Trick” will become part of the “toolkit” for identifying internal
threads.

All-in-All,  great post! It’s stuff like this that makes people stay on the
Porch for decades.

John Ruth
Metuchen, NJ