ISO 529:2017

ISO 529:2017 specifies the general dimensions of short machine taps and hand taps. These dimensions, established as functions of the thread diameter and pitch, are the following:
-      length of thread (maximum);
-      overall length;
-      shank diameter and dimensions of driving square;
-      dimensions of the connecting portion between the shank and threaded part.
ISO 529:2017 is applicable to taps intended for cutting the following threads:
a)    ISO metric threads:

-      coarse pitch;
-      fine pitch;

b)    ISO inch threads:

-      "Unified Coarse" series (UNC) and "Unified Fine" series (UNF);

c)    Inch threads, non-recommended:

-      "British Standard Whitworth" (BSW) and "British Standard Fine" (BSF);
-      "British Association" (BA).

NOTE 1       The overall length, thread length and diameters of shank for taps whose thread diameter and pitch are not listed in tables are given in Table A.1.
NOTE 2       Annex B gives an abstract from ISO 237 for shank diameters and size of driving squares, for information.
NOTE 3       Technical specifications for taps covered by this document (including marking) are given in ISO 8830.