I.S. EN 22857:1990
Current
The latest, up-to-date edition.
GROUND THREAD TAPS FOR ISO METRIC THREADS OF TOLERANCES 4H TO 8H AND 4G TO 6G COARSE AND FINE PITCHES - MANUFACTURING TOLERANCES ON THE THREADED PORTION
Hardcopy , PDF
English
01-01-1990
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
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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
Defines the manufacturing tolerances on the threaded portion of taps for producing the ISO metric threads of tolerance classes 4H to 8H and 4G to 6G.
| DocumentType |
Standard
|
| Pages |
52
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Current
|
| Standards | Relationship |
| EN 22857:1989 | Identical |
| ISO 2857:1973 | Identical |
| ISO 724:1993 | ISO general-purpose metric screw threads — Basic dimensions |
| ISO 965-2:1998 | ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality |
| ISO 529:2017 | Short machine taps and hand taps |
| ISO 965-1:2013 | ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data |
| ISO 965-3:1998 | ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threads |
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