ISO 6743-6:2018

SLOVENSKI STANDARD
01-junij-2018
1DGRPHãþD
SIST ISO 6743-6:2002
Maziva, industrijska olja in sorodni proizvodi (razred L) - Klasifikacija - 6. del:
Podskupina C (zobniški sistemi)
Lubricants, industrial oils and related products (class L) - Classification - Part 6: Family C
(gear systems)
Lubrifiants, huiles industrielles et produits connexes (classe L) - Classification - Partie 6:
Famille C (engrenages)
Ta slovenski standard je istoveten z: ISO 6743-6:2018
ICS:
75.100 Maziva Lubricants, industrial oils and
related products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 6743-6
Second edition
2018-01
Lubricants, industrial oils and related
products (class L) — Classification —
Part 6:
Family C (gear systems)
Lubrifiants, huiles industrielles et produits connexes (classe L) —
Classification —
Partie 6: Famille C (engrenages)
Reference number
©
ISO 2018
© ISO 2018, Published in Switzerland
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Explanation of symbols used . 1
5 Detailed classification . 2
Annex A (informative) Main parameters governing the choice of a gear lubricant .7
Bibliography . 8
Foreword
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www. iso. org/d irectives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www. iso. org/p atents).
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URL: www .iso. org/iso / foreword. html
This document was prepared by ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 4,
Classification and specifications.
This second edition cancels and replaces the first edition (ISO 6743-6:1990), which has been technically
revised.
The main change from the previous edition is that the table of classification now details the various
types of synthetic fluids, and includes environmentally acceptable fluids and specific fluids for
protection against the micro-pitting phenomenon.
A list of all the parts of ISO 6743 can be found on the ISO website.
iv © ISO 2018 – All rights reserved

Introduction
Recent evolutions in the area of gear lubrication have led to the necessity of an update of the
classification of gear lubricants.
The former classification mentioned “synthetic lubricants”, without any precision about their
chemical nature.
For some applications, environmentally acceptable lubricants are needed.
This new classification includes different types of synthetic lubricants and environmentally acceptable
lubricants. It includes also a specific category of lubricant exhibiting properties for the protection
against the micro-pitting phenomenon.
This completes the classification presented in the previous edition, ISO 6743-6:1990, and fulfils the
needs of the industry.
INTERNATIONAL STANDARD ISO 6743-6:2018(E)
Lubricants, industrial oils and related products (class L) —
Classification —
Part 6:
Family C (gear systems)
1 Scope
This document establishes the detailed classification of fluids of Family C (gear systems) which
belongs to class L (lubricants, industrial oils and related products). It can be read in conjunction with
ISO 6743-99.
The classification in this document concerns lubricants for industrial gears and excludes lubricants for
automotive gears.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Explanation of symbols used
4.1 This detailed classification of Family C has been established by defining the categories of products
required for the main applications of the family and final subdivision by reference to composition of
corresponding products.
4.2 Each category is designated by a symbol consisting of group of letters which, together,
constitute a code.
The first letter of the code (C) identifies the family of the product considered but any following letters
taken separately have no significance of their own.
The designation of each category can be supplemented by the addition of viscosity grades according to
ISO 3448.
NOTE The first letter of the code (C) identifies the family of the product considered, but none of the second
and third letters considered separately bear a proper meaning. In orde
...