Small 00 screw threads

[Tunalover]

Folks-
I'm using 00-90 screws in a design but I can't seem to find the right thread callout to put on the drawing for the internal threads that will be machined. One source said:

00-90 NS-2 (or, alternately, .047-90 NS-2).

Any input on this? Unbelievably, MACHINERY HANDBOOK 22nd edition didn't discuss this screw thread. Also, ASME B1.1 said nothing about it too.

Regards,
Tunalover

 

[diamondjim]

I would think .047-90UNF
see

http://websearch.cs.com/cs/boomfram...&remove_url=http://mdmetric.com/tech/tict.htm