"Jon" fired this volley in
news:tPLij.8816$W73.3610@trnddc04:

I'm doing a job which requires me to tap a hole in prep for a schrader
valve core.
The thread, according to Schrader's website, is 0.206"-36tpi

This tap is not commonly available from stock.
I know that I can special order this tap, but seems to be an
unnecessary expense for a short run job

If anyone has any of these that they would like to sell, or knows of a
source, please contact me

Jon,

I went through the same folly-worn path on a project in my shop.
Schrader wanted something like $80 for the tap, with a five week waiting
perior.

I ended up finding the best quality "tire valve tool" I could find, and
hardened the internal thread chaser. With that, and a bit of care, I was
able to tap the six holes I had to make for Schrader inserts.

If I were to do it again, I'd just fabricate the tap from some good air-
hardening stock, and be done with it for the foreseeable future.

LLoyd