Archived under: Equipment, Mouthpieces
Numbered Drills and Horn Mouthpieces
One question that came in today is one asked fairly often, about the numbers on horn mouthpieces. As in, what is 12, 8, etc.
Basically there is a set of machinists drills that are numbered and the numbers are similar to those used in wire gauge as well. The ever-useful-for-general-information Wikipedia reports,
Number and letter gauge drill bits are still in common use in the U.S.. In the past, they were popular elsewhere, but now have been largely discarded in favour of metric sizes….
Number drill bit gauge sizes are analogous to, but different from, American wire gauge.
There is a chart of the sizes in the Wikipedia article but in short all you really need to know as a horn player is that a #1 drill is the largest in the set. Actually I have drills as small as #80 in my model railroad tools. That size is 
roughly the size of a small needle, as can be seen in this photo, linked from the Wikipedia article.
Some mouthpiece makers have for many years used these drills as the system used to measure the bore of horn (and trumpet) mouthpieces. So a C-8 should have a bore that just lets a #8 drill pass through but not #7, which is slightly bigger. Etc. The letter is a designation for the shape of the cup.
In my studio I keep a complete set of drills #1-20 and it is very handy to sort out what things really are, especially when comparing brands and models, it is easy to fool the eye.
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