1 Scope and field of application
2 References
3 Basic data
3.1 Thread profile of nuts
3.2 Thread profile of tap
3.3 Tolerance classes of taps
3.4 Calculation of tap thread dimensions of
classes 1,2 and 3
4 Manufacturing tolerances on tap threads
4.1 Major diameter d
4.2 Pitch diameter d[2]
4.3 Minor diameter of tap d[1]
4.4 Tolerance on the angle alpha and half angle
alpha/2 of thread
4.5 Cumulative pitch error T[p] over any number of threads
5 Designation and marking of taps
6 Example of calculation of the dimensions of the threaded
portion of a tap
Annex A - Ground thread taps for ISO metric threads of
coarse pitch
Annex B - Ground thread taps for ISO metric threads of
fine pitch