Claudio,

Did you mean confusion of #14 with 1/4-inch?

A very rare #14-20 differs from a commonplace 1/4-20 by only a few thousandths
of an inch.

In the archives, circa 1993, you’ll find a tale of the day in which a local
hardware merchant sold me a #14-20 die by mistake...

The only use I know of #14-20 threads is in some older Singer sewing machines.

John Ruth

Sent from my iPhone

On Apr 5, 2020, at 12:39 PM, Claudio DeLorenzi mailto:claudio@d...">mailto:claudio@d...>> wrote:

Number 12 vs 1/4" confusion also

-- Claudio

On Sun., Apr. 5, 2020, 12:31 p.m. John Ruth, mailto:johnrruth@h...">mailto:johnrruth@h...>> wrote:
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
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