SIST ISO 678:1998

Straight bevel gears for general engineering and heavy engineering -- Modules and diametral pitches

Specifies and defines modules and diametral pitches. ISO 678 is intended essentially to facilitate the establishment of series of cutting tools, and cannot prevent the use of unstandardized modules or diametral pitches, for instance by using the tool for the module or diametral pitch corresponding to the next smaller size given in the table.

Engrenages coniques à denture droite de mécanique générale et de grosse mécanique -- Modules et diamétral pitches

Ravnozobi stožčasti zobniki za splošno in težko strojegradnjo - Moduli in premerovi razdelki

General Information

• Status: Published
• Publication Date: 31-May-1998
• ICS: 21.200 - Gears
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-1998
• Due Date: 01-Jun-1998
• Completion Date: 01-Jun-1998
• Ref Project: ISO 678:1976 - Straight bevel gears for general engineering and heavy engineering - Modules and diametral pitches

Overview

SIST ISO 678:1998 is an international standard published by the International Organization for Standardization (ISO) that specifies modules and diametral pitches for straight bevel gears used in general engineering and heavy engineering applications. This standard aims to streamline the establishment of series of cutting tools, ensuring compatibility and uniformity in gear manufacturing processes.

While ISO 678 primarily facilitates standardized module and diametral pitch selections, it does not restrict the use of unstandardized sizes. Manufacturers may opt for the tool equivalent to the next smaller module or diametral pitch size if necessary, offering flexibility in design and production.

Key Topics

• Modules and Diametral Pitches Defined

  • Module: The ratio of the pitch diameter (in millimeters) to the number of teeth on the gear, representing the spacing between gear teeth in metric units.
  • Diametral Pitch: The ratio of the number of teeth to the pitch diameter, measured in inches, representing tooth spacing in imperial units.

• Scope
  ISO 678 focuses on straight bevel gears for both general and heavy engineering fields. It covers standard sizes for modules and diametral pitches that facilitate consistent tooling and manufacturing.

• Standard vs. Unstandardized Sizes
  While preference is given to standardized sizes listed in the document, the standard acknowledges that non-standard sizes can be used, particularly if tooling for these sizes utilizes dimensions corresponding to the next smaller standardized pitch.

• Module Determination
  The standard defines the module based on the complementary cone, a key geometric concept for bevel gears distinguishing this standard from others applied to cylindrical gears.

Applications

SIST ISO 678:1998 applies to manufacturers, engineers, and designers working across sectors where precise and reliable straight bevel gears are essential. Key applications include:

• Gear Manufacturing: Assisting toolmakers in producing cutting tools aligned with common module and diametral pitch standards to optimize production efficiency and reduce cross-compatibility issues.
• Heavy Engineering Machinery: Supplying standardized gear specifications crucial for heavy-duty equipment such as mining, construction, and industrial machinery, where durability and precision are paramount.
• General Mechanical Engineering: Supporting the design and specification of transmission components for various machines requiring standardized bevel gears.
• International Trade and Quality Assurance: Providing a uniform reference that facilitates global trade and quality compliance by establishing common gear measurement units and specifications.

Related Standards

• ISO 677: Defines terms such as "basic rack" essential for understanding gear tooth geometry and complements ISO 678 by providing foundational definitions.
• ISO/R 1122: Offers the glossary of gear-related geometrical definitions, supporting the consistent interpretation of terms used in ISO 678.
• Other Gear Standards by ISO/TC 60: Covers various gear types and testing methods, contributing to a comprehensive framework for gear design and manufacturing standards within ISO.

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Keywords: ISO 678, straight bevel gears, modules, diametral pitches, gear standardization, gear cutting tools, mechanical engineering, heavy engineering, gear manufacturing, gear design standards

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-1998
5DYQR]RELVWRåþDVWL]REQLNL]DVSORãQRLQWHåNRVWURMHJUDGQMR0RGXOLLQ
SUHPHURYLUD]GHONL
Straight bevel gears for general engineering and heavy engineering -- Modules and
diametral pitches
Engrenages coniques à denture droite de mécanique générale et de grosse mécanique -
- Modules et diamétral pitches
Ta slovenski standard je istoveten z: ISO 678:1976
ICS:
21.200 Gonila Gears
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL STANDARD .
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHA(I OPI-AHM3ALWII I-IO CTAHAAPTIM3AIWI.ORGANISATION INTERNATIONALE DE NORMALISATION
Straight bevel gears for general engineering and heavy
engineering
- Modules and diametral pitches
Engrenages coniques a’ denture droite de mkanique g&xhle et de grosse me ’canique - Modules et
diametral pitches
First edition - 1976-06-15
UDC 621.833.2
Ref. No. IS0 678-1976 (E)
Descriptors : gears, bevel gears, teeth modulus, spacing.
Price based on 1 page
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being trans-
formed into International Standards. As part of this process, Technical
Committee ISO/TC 60 has reviewed IS0 Recommendation R 678 and found it
technically suitable for transformation. International Standard IS0 678 therefore
replaces IS0 Recommendation R 678-1968 to which it is technically identical.
IS0 Recommendation R 678 was approved by the Member Bodies of the following
countries :
Australia Hungary South Africa,
...

INTERNATIONAL STANDARD .
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHA(I OPI-AHM3ALWII I-IO CTAHAAPTIM3AIWI.ORGANISATION INTERNATIONALE DE NORMALISATION
Straight bevel gears for general engineering and heavy
engineering
- Modules and diametral pitches
Engrenages coniques a’ denture droite de mkanique g&xhle et de grosse me ’canique - Modules et
diametral pitches
First edition - 1976-06-15
UDC 621.833.2
Ref. No. IS0 678-1976 (E)
Descriptors : gears, bevel gears, teeth modulus, spacing.
Price based on 1 page
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being trans-
formed into International Standards. As part of this process, Technical
Committee ISO/TC 60 has reviewed IS0 Recommendation R 678 and found it
technically suitable for transformation. International Standard IS0 678 therefore
replaces IS0 Recommendation R 678-1968 to which it is technically identical.
IS0 Recommendation R 678 was approved by the Member Bodies of the following
countries :
Australia Hungary South Africa, Rep. of
Austria India Spain
Belgium Israel Sweden
Brazil Italy Switzerland
Bulgaria Japan Turkey
Chile
Netherlands United Kingdom
Czechoslovakia New Zealand
U.S.S.R.
France Poland Yugoslavia
Germany Portugal
No Member Body expressed disapproval of the Recommendation.
The Member Body of the following country disapproved the transformation of
lSO/R 678 into an International Standard :
German
...

NORME INTERNATIONALE
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAR OPI-AHM3ALUU-I l-I0 CTAHAAPTM3ALUWi *ORGANISATION INTERNATIONALE DE NORMALISATION
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Modules et diametral
pitches
- Modules and diame tral pitches
Straigh t bevel gears for general engineering and heavy engineering
Première édition - 1976-06-15
&DU 621.833.2 Réf. no : ISO 6784976 (FI
Descripteurs : engrenage, engrenage conique, module de denture, espacement.
Prix basé sur 1 page
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fedération mondiale
d’organismes nationaux de normalisation (Comités Membres KO). L’élaboration des
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
comme Recommandations ISO; maintenant, ces documents sont en cours de trans-
Compte tenu de cette procédure, le Comité
formation en Normes Internationales.
Technique lSO/TC 60 a examiné la Recommandation ISO/R 678 et est d’avis
qu’elle peut, du point de vue technique, être transformée en Norme Internationale.
remplace donc la Recomman-
La présente Norme Internationale
dation lSO/R 678-1968 à laquelle elle est techniquement identique.
La Recommandation lSO/R 678 avait été approuvée par les Comités Membres des
pays suivants :
Portugal
Afrique du Sud, Rép. d’ France
Allemagne Hongrie Royaume-Uni
Inde Suède
Australie
Israël Suisse
Autriche
Italie Tchécoslovaquie
Belgique
Brésil Japon Turquie
Bulgarie Nouvelle-Zélande U.R.S.S.
Chili Pays-Bas Yougoslavie
Espagne Pologne
Aucun Comité Membre n’avait désapprouvé la Recommandation.
Le Comité Membre du pays suivant a désapprouvé la transformation de la Recom-
mandation lSO/R 67
...

NORME INTERNATIONALE
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAR OPI-AHM3ALUU-I l-I0 CTAHAAPTM3ALUWi *ORGANISATION INTERNATIONALE DE NORMALISATION
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Modules et diametral
pitches
- Modules and diame tral pitches
Straigh t bevel gears for general engineering and heavy engineering
Première édition - 1976-06-15
&DU 621.833.2 Réf. no : ISO 6784976 (FI
Descripteurs : engrenage, engrenage conique, module de denture, espacement.
Prix basé sur 1 page
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fedération mondiale
d’organismes nationaux de normalisation (Comités Membres KO). L’élaboration des
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
comme Recommandations ISO; maintenant, ces documents sont en cours de trans-
Compte tenu de cette procédure, le Comité
formation en Normes Internationales.
Technique lSO/TC 60 a examiné la Recommandation ISO/R 678 et est d’avis
qu’elle peut, du point de vue technique, être transformée en Norme Internationale.
remplace donc la Recomman-
La présente Norme Internationale
dation lSO/R 678-1968 à laquelle elle est techniquement identique.
La Recommandation lSO/R 678 avait été approuvée par les Comités Membres des
pays suivants :
Portugal
Afrique du Sud, Rép. d’ France
Allemagne Hongrie Royaume-Uni
Inde Suède
Australie
Israël Suisse
Autriche
Italie Tchécoslovaquie
Belgique
Brésil Japon Turquie
Bulgarie Nouvelle-Zélande U.R.S.S.
Chili Pays-Bas Yougoslavie
Espagne Pologne
Aucun Comité Membre n’avait désapprouvé la Recommandation.
Le Comité Membre du pays suivant a désapprouvé la transformation de la Recom-
mandation lSO/R 67
...