ISO 2857:1973/Amd 1:1984
(Amendment)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 — Amendment 1
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 — Amendment 1
Tarauds à filets rectifiés pour filetages métriques ISO de tolérance 4H à 8H et 4G à 6G à pas gros et à pas fins — Tolérances d'exécution de la partie taillée — Amendement 1
General Information
- Status
- Published
- Publication Date
- 30-Jun-1984
- Current Stage
- 6060 - International Standard published
- Start Date
- 01-Jul-1984
- Completion Date
- 14-Feb-2026
Relations
- Effective Date
- 06-Jun-2022
- Effective Date
- 15-Apr-2008
Overview
ISO 2857:1973/Amd 1:1984 is an international standard published by the International Organization for Standardization (ISO). This amendment applies to ground thread taps for ISO metric threads, specifically those within tolerances 4H to 8H and 4G to 6G, covering both coarse and fine pitches. The amendment focuses on updating manufacturing tolerances on the threaded portion of these tools, with a central emphasis on the tolerances of the half-angle (a/2) of the thread.
This standard ensures that the dimensional accuracy and performance of ground thread taps meet rigorous international requirements, which is vital for reliable thread cutting and assembly in mechanical engineering and manufacturing sectors.
Key Topics
- Dimensional Tolerances: The amendment details the permissible variances for key thread dimensions, especially the half-angle (a/2).
- ISO Metric Threads: Applies to metric threading systems, the global standard for engineering threads.
- Taps for Coarse and Fine Pitches: The scope encompasses a wide range of thread pitch types, addressing diverse industrial applications.
- Tolerance Classes: Covers tolerance classes 4H to 8H and 4G to 6G, providing flexibility for different fit and strength requirements.
- Standardized Measurement: Implements updated table values for practical and consistent measurement of tap threads.
Applications
ISO 2857:1973/Amd 1:1984 serves various industries requiring precise, reliable threaded connections, including:
- Machinery Manufacturing: Ensures compatibility and interchangeability of threaded components across global supply chains.
- Automotive and Aerospace: Guarantees high-quality threads necessary for safety-critical and load-bearing applications.
- Toolmaking: Provides guidelines for manufacturers producing ground thread taps, ensuring uniformity and performance.
- Metalworking: Supports machinists and fabricators in achieving consistent thread profiles and tight tolerances, reducing errors and rework.
Practical value: By standardizing tap thread tolerances, this amendment helps reduce production variability, enhances component fit, and supports compliance with international engineering specifications. The updated tolerances also ensure the virtual pitch diameter error does not exceed established proportions of the pitch diameter tolerance for corresponding nut threads. This helps maintain function and longevity in threaded assemblies.
Related Standards
Professionals using ISO 2857:1973/Amd 1:1984 may also reference:
- ISO 965 - General tolerances for ISO metric screw threads
- ISO 529 - Technical requirements for metric thread taps
- ISO 2857:1973 - The base standard for manufacturing tolerances on ground thread taps
- ISO/TC 29 - Standards from the ISO Technical Committee for Small Tools
These related standards ensure comprehensive coverage for screw thread production, measurement, and quality assurance according to globally recognized ISO practices.
Keywords: ISO 2857:1973/Amd 1:1984, ground thread taps, ISO metric threads, thread tolerances, thread angle, manufacturing tolerances, metric thread taps, coarse pitch, fine pitch, tool standards, engineering threads, ISO standards.
Buy Documents
ISO 2857:1973/Amd 1:1984 - 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 — Amendment 1 Released:7/1/1984
ISO 2857:1973/Amd 1:1984 - Tarauds a filets rectifiés pour filetages métriques ISO de tolérance 4H a 8H et 4G a 6G a pas gros et a pas fins — Tolérances d'exécution de la partie taillée — Amendement 1 Released:7/1/1984
ISO 2857:1973/Amd 1:1984 - Tarauds a filets rectifiés pour filetages métriques ISO de tolérance 4H a 8H et 4G a 6G a pas gros et a pas fins — Tolérances d'exécution de la partie taillée — Amendement 1 Released:7/1/1984
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Frequently Asked Questions
ISO 2857:1973/Amd 1:1984 is a standard published by the International Organization for Standardization (ISO). Its full title is "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 — Amendment 1". This standard covers: 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 — Amendment 1
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 — Amendment 1
ISO 2857:1973/Amd 1:1984 is classified under the following ICS (International Classification for Standards) categories: 25.100.50 - Taps and threading dies. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 2857:1973/Amd 1:1984 has the following relationships with other standards: It is inter standard links to ISO 2857:1973; is excused to ISO 2857:1973. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 2857:1973/Amd 1:1984 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL STANDARD IS0 2857-19731AMENDMENT 1
Published 1984-07-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION- MEXAYHAPOflHAfl OPTAHM3ALblfl IlO CTAHAAPTM3ALlMM.ORGANISATlON INTERNATIONALE DE NORMALlSATlON
Ground thread taps for IS0 Metric threads of tolerance 4H
to 8H and 4G to 6G coarse and fine pitches -
Manufacturing tolerances on the threaded portion
AMENDMENT 1
Amendment 1 to international Standard IS0 2857-1973 was developed by Technical Committee lSO/TC 29, Small tools, and was
circulated to the member bodies in January 1983.
It has been approved by the member bodies of the following countries:
Australia Hungary South Africa, Rep. of
Austria India Sweden
Belgium Italy Switzerland
China United Kingdom
Japan
Czechoslovakia Poland USSR
Germany, F. R. Romania
The member bodies of the following countries expressed disapproval of the document on technical grounds:
France
USA
UDC 621.993 Ref. No. IS0 2857-1973/Al-1984 (E)
, 2
Descriptors : tools, cutting tools, taps, screw threads, dimensional tolerances.
Q)
-
0 International Organization for Standardization, 1984 @
Printed in Switzerland
Price based on 3 pages
IS0 2857~1973/Al-1984 (E)
Delete clause 4.4 and substitute:
4.4 Tolerances on the half-angle a/2 of thread
The values for tolerances on the half-angle a/2 are based on the pitch of the thread and shall be in accordance with the values of
table 3.
Table 3 - Tolerances on the half-angle a/2
Pitch Tolerance on a/2
zk 70'
0,25
0,3
* 50'
0,35
Ot4
0,45
AI 35'
Or5
0,6
z!I 30'
0,75
W3
I,25 + 25'
L5
I,75
23 * 20'
3,5
4,5
5 III 15'
5,5
NOTE - For a given pitch, the half-angle tolerance a/2 has been
calculated so that the equivalent error on the virtual pitch diameter
does not exceed a stated proportion of the pitch diameter tolerance
To2 for the corresponding class 5 nut thread.
The stated proportion is 8 %, except for pitches finer than 0,4 mm
where it is 10 %. The calculated values have been rounded off to the
nearest 5’ to bring them within the scope of practical measurement.
IS0 285701973/A%1984 (E)
Page 7
Clause 6
Delete the line before the last in the left-hand column and substitute:
“Tolerance on the half-angle of pitch (a/2)“.
Page 9
Annex A
In the table, replace the column “Tolerance on a and a/2” by the following:
Designation nomUinal / r’Fr’
I
I
~-~--~-~-~~~-~~~~~~
M 1 I
------------____-------
-------------------
;:2
-------------------
-------------------
-------------------
If 50'
I,8
-------------------
-------------------
-------------------
2,5
--------------------
zk 35'
-------------------
3,5
-------------------
...
NORME INTERNATIONALE ISO 28574973/AMENDEMENT 1
Publié 1984-07-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. ME>KflYHAPOflHAfl OPrAHM3A~MFl no CTAH~APTM3Al&lM.ORGANISATION INTERNATIONALE DE NORMALISATION
Tarauds à filets rectifiés pour filetages métriques ISO de
tolérance 4H à 8H et 4G à 6G à pas gros et à pas fins -
Tolérances d’exécution de la partie taillée
AMENDEMENT 1
L’Amendement 1 à la Norme internationale ISO 28574973 a été élaboré par le comité technique ISO/TC 29, Petit outi//age, et a été
soumis aux comités membres en janvier 1983.
Les comités membres des pays suivants l’ont approuvé:
Afrique du Sud, Rép. d’
Hongrie
Royaume-Uni
Allemagne, R.F.
Inde Suède
Australie
Italie
Suisse
Autriche
Japon Tchécoslovaquie
Belgique Pologne
URSS
Chine Roumanie
Les comités membres des pays suivants l’ont désapprouvé pour des raisons techniques:
France
USA
Réf. no: ISO 2857~1973/Al-1984 (FI
CDU 621.993
Descripteurs: outil, outil de coupe, taraud, filetage, tolérance de dimension.
0 Organisation Internationale de Normalisation, 1984 0
Imprimé en Suisse
Prix basé sur 3 pages
ISO 2857-1973/Al-1984 (FI
Remplacer le paragraphe 4.4 par le texte suivant:
4.4 Tolérances sur le demi-angle a/2 du filet
Les valeurs de la tolérance sur a/2 sont fixées en fonction du pas du filetage et doivent être conformes aux valeurs données dans le
tableau 3.
Tableau 3 - Tolérances sur le demi-angle a/2
Pas I Tolérance sur a/2
I!I 70’
0,25
I
0,3
0,35
Ik 50’
0,4
0,45
rt. 35’
0,5
0,75 + 30’
1,25
I!I 25’
1,5
3,5 3,5
4 4
4,5 4,5
z!I z!I 15’ 15’
5 5
5,5 5,5
6 6
- Pour un pas donné, la tolérance sur le demi-angle a/2 est telle
NOTE
que l’erreur équivalente sur le diamètre virtuel sur flancs n’excède pas
une proportion donnée de la tolérance sur le diamètre sur flancs TO2
pour la classe 5 du filetage de l’écrou.
Ces valeurs ont été calculées sur la bas
...
NORME INTERNATIONALE ISO 28574973/AMENDEMENT 1
Publié 1984-07-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. ME>KflYHAPOflHAfl OPrAHM3A~MFl no CTAH~APTM3Al&lM.ORGANISATION INTERNATIONALE DE NORMALISATION
Tarauds à filets rectifiés pour filetages métriques ISO de
tolérance 4H à 8H et 4G à 6G à pas gros et à pas fins -
Tolérances d’exécution de la partie taillée
AMENDEMENT 1
L’Amendement 1 à la Norme internationale ISO 28574973 a été élaboré par le comité technique ISO/TC 29, Petit outi//age, et a été
soumis aux comités membres en janvier 1983.
Les comités membres des pays suivants l’ont approuvé:
Afrique du Sud, Rép. d’
Hongrie
Royaume-Uni
Allemagne, R.F.
Inde Suède
Australie
Italie
Suisse
Autriche
Japon Tchécoslovaquie
Belgique Pologne
URSS
Chine Roumanie
Les comités membres des pays suivants l’ont désapprouvé pour des raisons techniques:
France
USA
Réf. no: ISO 2857~1973/Al-1984 (FI
CDU 621.993
;z
Descripteurs: outil, outil de coupe, taraud, filetage, tolérance de dimension.
0 Organisation Internationale de Normalisation, 1984 l
Imprimé en Suisse
Prix basé sur 3 pages
ISO 2857-1973/Al-1984 (FI
Page6
Remplacer le paragraphe 4.4 par le texte suivant:
4.4 Tolérances sur le demi-angle a/2 du filet
Les valeurs de la tolérance sur a/2 sont fixées en fonction du pas du filetage et doivent être conformes aux valeurs données dans le
tableau 3.
Tableau 3 - Tolérances sur le demi-angle a/2
Pas Tolérance sur a/2
I
I!I 70'
0,25
Ot3
0,35
l Ik 50'
0,4
0,45
rt. 35'
Of5
0,75 + 30'
1,25
I!I 25'
L5
1‘75
If: 20'
2,5
3,5
4,5
z!I 15'
5,5
- Pour un pas donné, la tolérance sur le demi-angle a/2 est telle
NOTE
que l’erreur équivalente sur le diamètre virtuel sur flancs n’excède pas
une proportion donnée de la tolérance sur le diamètre sur flancs TO2
pour la classe 5 du filetage de l’écrou.
Ces valeurs ont été calculées sur la base d’une porportion de 8 %,
excepté pour les pas inférieurs à 0,4 mm où la proportion est de 10 %.
Les valeurs calculées ont été arrondies aux 5’ les plus proches afin
qu’elles soient compatibles avec les mesurages usuels.
ISO 2857-1973/.Al-1984 (FI
Page 7
Chapitre 6
Remplacer le texte de l’avant-dernière colonne de gauche du tableau par le texte suivant:
((Tolérance sur le demi-angle du filet (a/2)».
Page 9
Annexe A
Remplacer dans le tableau la colonne «ToIét-. sur a et a/2» par la colonne suivante:
Pas -_ ------------------
P
I t-
1 I I
--~--~~------~-~-~~
--------------------
I!I 70’
--------------------
-------------------
------------------~-
---- ---------------- + 50’
--------------------
-------------------
-------------~------
- ------ ------------- &- 35’
--------------------
------- ----- --------
---------------------
rt 30’
--------------------
-------------------
-------~----
...
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