determining thread pitch

guntech said:
Maybe go back and read this thread from the start...
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I did, and the measurement is not clear. A more accurate, direct measurement than ".220 would have 0002 thou clearance". would help because that would imply 2 tenths (of a thou) or 5 microns clearance. Is the tap drill size .2202" or .222"?
 
piker said:
Post #11
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Ah! Thanks! Missed that!

Probably a UN thread form, if an American reamer. That still leaves maybe 5 different threads for any particular diameter, and more, if the maker is prone to stupidity!

All you really need to do is to look up all the UNS threads, plus the UNS EF set. 48,46,40,36, and on down the line. I'm sure there are finer than 48, too.
 
trevj said:
Ah! Thanks! Missed that!

Probably a UN thread form, if an American reamer. That still leaves maybe 5 different threads for any particular diameter, and more, if the maker is prone to stupidity!

All you really need to do is to look up all the UNS threads, plus the UNS EF set. 48,46,40,36, and on down the line. I'm sure there are finer than 48, too.
Click to expand...
Good post, forced me to do a sanity check. M3x0.6 with 75% thread, drilled with a #41 is in that ballpark too.
 
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