View Full Version : taps

03-28-2005, 07:35 PM
I have small taps that I cannot identify for size. Can they be identified by measuring the number of threads with a thread pitch gage and measuring the OD with a mike.?

03-28-2005, 07:46 PM
yes you can.
how many do you have?
you can get a thread measuring plate from Brownell's, Screw Checker i think, its great for checking things like this...jim

Forrest Addy
03-29-2005, 02:47 PM
Be advised that tap major diameters are a trifle larger than the nominal size of the standard thread to achieve male crest/female root thread clearance. Also taps have circular relief so measure at the thread crest only. Smaller taps may have three flutes compounding the problem.

[This message has been edited by Forrest Addy (edited 03-29-2005).]