BS 949-4:1990
Current
The latest, up-to-date edition.
Screwing taps Specification for metric ground thread taps: manufacturing tolerances
Hardcopy , PDF
English
29-06-1990
National foreword
Brief history
Text of EN22 857
Specification
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 d2
4.3 Minor diameter of tap d1
4.4 Tolerances on the half-angle alpha/2 of thread
4.5 Cumulative pitch error Tp 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
Annexes
A. Ground thread taps for ISO metric threads of
coarse pitch
B. Ground thread taps for ISO metric threads of
fine pitch
National appendix A
National appendix B
Cooperating organizations
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