[pianotech] Brass plate tap sizes

[Joseph Garrett]

Ron said:
"I worked out the numbers, and these are 3-56, a standard size"

Ron,
For all practical purposes, yes that is what my gauges tell me.....er
sorta.<G> Honestly, it did not occur to me to "do the math" conversion!<G>
If the 4.5mm threaded hole was more than 1/2 inch, it would start to bind
with a 3-56. At least that's what my gauges are telling me.<G> However, in
this application, where the threaded material is less than 1/16", it's not
an issue.
There still remains, tho, what the heck all of those NOS plates/screws, I
have, are? As near as I can calculate, the thread count is around 52 tpi! I
don't know of any "standard" that fills that bill. Go figger.
Thanks for your help and enlightenment.<G>
Best,
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I
http://gpianoworks.com/