IEC 60072-2:2025
(Main)Dimensions and output series for rotating electrical machines - Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
Dimensions and output series for rotating electrical machines - Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
IEC 60072-2: 2025 covers the majority of rotating electrical machines for industrial purposes within the dimension range and output powers:
- Foot-mounted: shaft heights: 355 mm to 1 000 mm.
- Flange-mounted: pitch circle diameter of flange: 1 180 mm to 2 360 mm.
It gives tables of fixing dimensions, shaft extension dimensions and their tolerances. However, the variety of construction and the wide range of applications for the large machines with shaft heights above 315 mm have led to the establishment of a relatively large number of values for the dimension in order to cover all possible constructions. Owing to this, the present part covers a wider range than IEC 60072-1 within which range values suitable for all designs or for a more detailed standardization can be chosen. NOTE The mounting dimensions given in this document for shaft heights 355 mm and 400 mm have been chosen from values given in IEC 60072-1.
This second edition cancels and replaces the first edition published in 1990. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) complete revision on the basis of IEC 60072-1;
b) additional tolerances and measurements for shafts and flanges (DIN SPEC 42955).
Dimensions et séries de puissance des machines électriques tournantes - Partie 2 : Désignation des carcasses entre 355 et 1 000 et des brides entre 1 180 et 2 360
IEC 60072-2:2025 couvre la majorité des machines électriques tournantes pour usages industriels dans la gamme des dimensions et les puissances:
- Fixation par pattes: hauteurs d'axes: 355 mm à 1 000 mm.
- Fixation par bride: diamètre du cercle primitif de la bride: 1 180 mm à 2 360 mm.
Elle donne les tableaux des dimensions de fixation, des dimensions des bouts d'arbre et de leurs tolérances. Toutefois, la diversité des conceptions et la vaste gamme d'applications des grandes machines présentant des hauteurs d'axes supérieures à 315 mm ont conduit à l'établissement d'un nombre relativement important de valeurs de dimensions afin de couvrir toutes les conceptions possibles. De ce fait, la présente partie couvre une gamme de dimensions plus large que l'IEC 60072-1, parmi lesquelles des valeurs appropriées peuvent être choisies pour toutes les conceptions ou pour effectuer une normalisation plus détaillée. NOTE Les dimensions de fixation indiquées dans le présent document pour des hauteurs d'axes de 355 mm et 400 mm ont été choisies à partir des valeurs fournies dans l'IEC 60072-1.
Cette deuxième édition annule et remplace la première édition parue en 1990. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) révision complète par rapport à l'IEC 60072-1;
b) ajout de tolérances et de mesurages pour les arbres et les brides (DIN SPEC 42955).
General Information
Standards Content (Sample)
IEC 60072-2 ®
Edition 2.0 2025-09
INTERNATIONAL
STANDARD
Dimensions and output series for rotating electrical machines -
Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
ICS 29.160.01 ISBN 978-2-8327-0653-4
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CONTENTS
FOREWORD. 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols . 4
4.1 Letter symbols for dimensions . 4
4.2 Dimensional sketches. 6
5 Designations of machines . 7
5.1 Foot-mounted machines . 7
5.2 Flange-mounted machines . 7
5.3 Foot- and flange mounted machines . 7
5.4 Shaft extension . 7
6 Fixing dimensions . 7
6.1 Foot-mounted machines . 7
6.2 Flange-mounted machines . 10
7 Shaft end dimensions and tolerances . 10
8 Methods of measurement . 11
8.1 Shaft extensions run out . 11
8.2 Concentricity of spigot and shaft . 12
8.3 Perpendicularity of mounting face of flange to shaft . 12
9 Preferred rated output values . 13
Bibliography . 14
Figure 1 – Dimensional sketches . 6
Figure 2 – Illustration of the measurement of shaft extensions runout . 12
Figure 3 – Illustration of the measurement of concentricity . 12
Figure 4 – Illustration of the measurement of perpendicularity . 13
Table 1 – Dimensions H and A . 8
Table 2 – Dimension H and B . 9
Table 3 – Dimensions and tolerances for flanges with pitch circle diameters from
1 180 mm to 2 360 mm . 10
Table 4 – Dimensions and tolerances for shaft ends . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Dimensions and output series for rotating electrical machines -
Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
FOREWORD
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IEC 60072-2 has been prepared by IEC technical committee TC 2: Rotating machinery. It is an
International Standard.
This second edition cancels and replaces the first edition published in 1990. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) complete revision on the basis of IEC 60072-1;
b) additional tolerances and measurements for shafts and flanges (DIN SPEC 42955).
The text of this International Standard is based on the following documents:
Draft Report on voting
2/2208/CDV 2/2240/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60072 series, published under the general title Dimensions and
Output series for rotating electrical machines, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This part of IEC 60072 covers the majority of rotating electrical machines for industrial purposes
within the dimension range and output powers:
– Foot-mounted: shaft heights: 355 mm to 1 000 mm.
– Flange-mounted: pitch circle diameter of flange: 1 180 mm to 2 360 mm.
It gives tables of fixing dimensions, shaft extension dimensions and their tolerances. However,
the variety of construction and the wide range of applications for the large machines with shaft
heights above 315 mm have led to the establishment of a relatively large number of values for
the dimension in order to cover all possible constructions. Owing to this, the present part covers
a wider range than IEC 60072-1 within which range values suitable for all designs or for a more
detailed standardization can be chosen.
NOTE The mounting dimensions given in this document for shaft heights 355 mm and 400 mm have been chosen
from values given in IEC 60072-1.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 Symbols
4.1 Letter symbols for dimensions
The dimensional sketches in 4.2 illustrate the symbols defined below. Mandatory dimensions
are marked with *.
*A distance between centre-lines of fixing holes (end view)
AA width of the end of the foot (end view)
AB over-all dimension across the feet (end view)
AC maximum diameter (envelope size) of the machine (e.g. fan cover; excluded are terminal box and feet)
AD distance from the centre-line of the machine to extreme outside of the terminal box or other most salient
part mounted on the side of the machine
*B distance between the centre-lines of the fixing holes (side view)
BA length of the feet (drive end side; side view)
BB over-all dimension across the feet (side view)
BC distance from the shoulder on the shaft at D-end to the beginning of the foot (side view)
BD length of the feet (non-drive end side; side view)
*C distance from the shoulder on the shaft at D-end to the centre-line of the mounting holes in the nearest
feet
CA distance from the shoulder on the shaft at N-end to the centre-line of the mounting holes in the nearest
feet
*CB rounding fillet at the shoulder on the shaft at D-end
CC rounding fillet at the shoulder on the shaft at N-end
*D diameter of the shaft extension at D-end
DA diameter of the shaft extension at N-end
*DB thread-size in the centre hole at D-end
DC thread-size in the centre hole at N-end
*E length of the shaft extension from the shoulder at D-end
EA length of the shaft extension from the shoulder at N-end
*EB length o
...
IEC 60072-2 ®
Edition 2.0 2025-09
NORME
INTERNATIONALE
Dimensions et séries de puissance des machines électriques tournantes -
Partie 2: Désignation des carcasses entre 355 et 1 000 et des brides entre 1 180
et 2 360
ICS 29.160.01 ISBN 978-2-8327-0653-4
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SOMMAIRE
AVANT-PROPOS . 2
1 Domaine d'application . 4
2 Références normatives . 4
3 Termes et définitions . 4
4 Symboles . 4
4.1 Symboles littéraux pour les dimensions . 4
4.2 Plans dimensionnels . 6
5 Désignations des machines . 7
5.1 Machines à fixation par pattes . 7
5.2 Machines à fixation par bride . 7
5.3 Machines à fixation par pattes et par bride . 7
5.4 Bout d'arbre . 7
6 Dimensions de fixation . 7
6.1 Machines à fixation par pattes . 7
6.2 Machines à fixation par bride . 10
7 Dimensions des bouts d'arbre et tolérances . 10
8 Méthodes de mesure . 11
8.1 Battement des bouts d'arbre . 11
8.2 Concentricité de l'emboîtement et de l'arbre . 12
8.3 Perpendicularité de la face d'appui de la bride par rapport au bout d'arbre . 12
9 Valeurs préférentielles de puissance assignée . 13
Bibliographie . 14
Figure 1 – Plans dimensionnels . 6
Figure 2 – Schéma de mesure du battement des bouts d'arbre . 12
Figure 3 – Schéma de mesure de la concentricité . 12
Figure 4 – Schéma de mesure de la perpendicularité . 13
Tableau 1 – Dimensions H et A . 8
Tableau 2 – Dimensions H et B . 9
Tableau 3 – Dimensions et tolérances pour les brides dont le diamètre du cercle
primitif est compris entre 1 180 mm et 2 360 mm . 10
Tableau 4 – Dimensions des bouts d'arbre et tolérances . 11
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Dimensions et séries de puissance des machines électriques tournantes -
Partie 2: Désignation des carcasses entre 355 et 1 000
et des brides entre 1 180 et 2 360
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L'IEC 60072-2 a été établie par le comité d'études 2 de l'IEC: Machines tournantes. Il s'agit
d'une Norme internationale.
Cette deuxième édition annule et remplace la première édition parue en 1990. Cette édition
constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition
précédente:
a) révision complète par rapport à l'IEC 60072-1;
b) ajout de tolérances et de mesurages pour les arbres et les brides (DIN SPEC 42955).
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
2/2208/CDV 2/2240/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications.
Une liste de toutes les parties de la série IEC 60072, publiées sous le titre général Dimensions
et séries de puissance des machines électriques tournantes, se trouve sur le site web de l'IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
1 Domaine d'application
La présente partie de l'IEC 60072 couvre la majorité des machines électriques tournantes pour
usages industriels dans la gamme des dimensions et les puissances:
– Fixation par pattes: hauteurs d'axes: 355 mm à 1 000 mm.
– Fixation par bride: diamètre du cercle primitif de la bride: 1 180 mm à 2 360 mm.
Elle donne les tableaux des dimensions de fixation, des dimensions des bouts d'arbre et de
leurs tolérances. Toutefois, la diversité des conceptions et la vaste gamme d'applications des
grandes machines présentant des hauteurs d'axes supérieures à 315 mm ont conduit à
l'établissement d'un nombre relativement important de valeurs de dimensions afin de couvrir
toutes les conceptions possibles. De ce fait, la présente partie couvre une gamme de
dimensions plus large que l'IEC 60072-1, parmi lesquelles des valeurs appropriées peuvent
être choisies pour toutes les conceptions ou pour effectuer une normalisation plus détaillée.
NOTE Les dimensions de fixation indiquées dans le présent document pour des hauteurs d'axes de 355 mm et
400 mm ont été choisies à partir des valeurs fournies dans l'IEC 60072-1.
2 Références normatives
Le présent document ne contient aucune référence normative.
3 Termes et définitions
Aucun terme n'est défini dans le présent document.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
– IEC Electropedia: disponible à l'adresse https://www.electropedia.org/
– ISO Online browsing platform: disponible à l'adresse https://www.iso.org/obp
4 Symboles
4.1 Symboles littéraux pour les dimensions
Les symboles littéraux ci-dessous sont reproduits sur les plans dimensionnels fournis au 4.2.
Les dimensions obligatoires sont marquées *.
*A entre-axes des trous de fixation (vue transversale)
AA largeur de la base de la patte (vue transversale)
AB largeur totale entre les bords des pattes (vue transversale)
AC diamètre maximal (taille d'enveloppe) de la machine (par exemple, couvercle du ventilateur; hors boîte à
bornes et pattes)
AD distance entre l'axe de la machine et le bord extérieur de la boîte à bornes ou de toute autre partie
saillante sur le côté de la machine
*B entre-axes des trous de fixation (vue longitudinale)
BA longueur des pattes (côté entraînement; vue longitudinale)
BB longueur totale entre les bords des pattes (vue longitudinale)
BC distance entre l'épaulement de l'arbre côté D et le début des pattes (vue longitudinale)
BD longueur des pattes (côté opposé à l'entraînement; vue longitudinale)
*C distance entre l'épaulement de l'arbre côté D et l'axe des trous de fixation sur la patte la plus proche
CA distance entre l'épaulement de l'arbre côté N et l'axe des trous de fixation sur la patte la plus proche
*CB congé à l'épaulement de l'arbre côté D
CC congé à l'épaulement de l'arbre côté N
*D diamètre du bout d'arbre côté D
DA diamètre du bout d'arbre côté N
*DB dimension de filetage du trou central côté D
DC dimension de filetage du trou central côté N
*E longueur du bout d'arbre côté D prise depuis l'épaulement
EA longueur du bout d'arbre côté N prise depuis l'épaulement
*EB longueur de la clavette côté D
EC longueur de la clavette côté N
*ED distance entre l'épaulement de l'arbre côté D et l'extrémité la plus proche de la rainure de clavette
EE distance entre l'épaulement de l'arbre côté N et l'extrémité la plus proche de la rainure de clavette
*F largeur de la rainure de clavette ou de la clavette du bout d'arbre côté D
FA largeur de la rainu
...
IEC 60072-2 ®
Edition 2.0 2025-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Dimensions and output series for rotating electrical machines -
Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
Dimensions et séries de puissance des machines électriques tournantes -
Partie 2: Désignation des carcasses entre 355 et 1 000 et des brides entre 1 180
et 2 360
ICS 29.160.01 ISBN 978-2-8327-0653-4
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CONTENTS
FOREWORD. 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols . 4
4.1 Letter symbols for dimensions . 4
4.2 Dimensional sketches. 6
5 Designations of machines . 7
5.1 Foot-mounted machines . 7
5.2 Flange-mounted machines . 7
5.3 Foot- and flange mounted machines . 7
5.4 Shaft extension . 7
6 Fixing dimensions . 7
6.1 Foot-mounted machines . 7
6.2 Flange-mounted machines . 10
7 Shaft end dimensions and tolerances . 10
8 Methods of measurement . 11
8.1 Shaft extensions run out . 11
8.2 Concentricity of spigot and shaft . 12
8.3 Perpendicularity of mounting face of flange to shaft . 12
9 Preferred rated output values . 13
Bibliography . 14
Figure 1 – Dimensional sketches . 6
Figure 2 – Illustration of the measurement of shaft extensions runout . 12
Figure 3 – Illustration of the measurement of concentricity . 12
Figure 4 – Illustration of the measurement of perpendicularity . 13
Table 1 – Dimensions H and A . 8
Table 2 – Dimension H and B . 9
Table 3 – Dimensions and tolerances for flanges with pitch circle diameters from
1 180 mm to 2 360 mm . 10
Table 4 – Dimensions and tolerances for shaft ends . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Dimensions and output series for rotating electrical machines -
Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60072-2 has been prepared by IEC technical committee TC 2: Rotating machinery. It is an
International Standard.
This second edition cancels and replaces the first edition published in 1990. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) complete revision on the basis of IEC 60072-1;
b) additional tolerances and measurements for shafts and flanges (DIN SPEC 42955).
The text of this International Standard is based on the following documents:
Draft Report on voting
2/2208/CDV 2/2240/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60072 series, published under the general title Dimensions and
Output series for rotating electrical machines, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This part of IEC 60072 covers the majority of rotating electrical machines for industrial purposes
within the dimension range and output powers:
– Foot-mounted: shaft heights: 355 mm to 1 000 mm.
– Flange-mounted: pitch circle diameter of flange: 1 180 mm to 2 360 mm.
It gives tables of fixing dimensions, shaft extension dimensions and their tolerances. However,
the variety of construction and the wide range of applications for the large machines with shaft
heights above 315 mm have led to the establishment of a relatively large number of values for
the dimension in order to cover all possible constructions. Owing to this, the present part covers
a wider range than IEC 60072-1 within which range values suitable for all designs or for a more
detailed standardization can be chosen.
NOTE The mounting dimensions given in this document for shaft heights 355 mm and 400 mm have been chosen
from values given in IEC 60072-1.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 Symbols
4.1 Letter symbols for dimensions
The dimensional sketches in 4.2 illustrate the symbols defined below. Mandatory dimensions
are marked with *.
*A distance between centre-lines of fixing holes (end view)
AA width of the end of the foot (end view)
AB over-all dimension across the feet (end view)
AC maximum diameter (envelope size) of the machine (e.g. fan cover; excluded are terminal box and feet)
AD distance from the centre-line of the machine to extreme outside of the terminal box or other most salient
part mounted on the side of the machine
*B distance between the centre-lines of the fixing holes (side view)
BA length of the feet (drive end side; side view)
BB over-all dimension across the feet (side view)
BC distance from the shoulder on the shaft at D-end to the beginning of the foot (side view)
BD length of the feet (non-drive end side; side view)
*C distance from the shoulder on the shaft at D-end to the centre-line of the mounting holes in the nearest
feet
CA distance from the shoulder on the shaft at N-end to the centre-line of the mounting holes in the nearest
feet
*CB rounding fillet at the shoulder on the shaft at D-end
CC rounding fillet at the shoulder on the shaft at N-end
*D diameter of the shaft extension at D-end
DA diameter of the shaft extension at N-end
*DB thread-size in the centre hole at D-end
DC thread-size in the centre hole at N-end
*E length of the shaft extension from the shoulder at D-end
EA length of the shaft extension from the shoulder at N-end
*EB length of the key at D-end
EC length of the key at N-end
*ED distance from the shoulder on the shaft at D-end to the nearest end of the keyway
EE distance from the shoulder on the shaft at N-end to the nearest end of the keyway
*F width of the keyway or key of the shaft extension at D-end
FA width of the keyway or key of the shaft extension at N-end
*FB rounding fillet in the bottom of the keyway at D-end
FC rounding fillet in the bottom of the keyway at N-end
FF Recommended designation for flanges
G distance from the bottom of the keyway to the opposite surface of the shaft extension at D-end
*GA distance from the top of the key to the opposite surface of the shaft extension at D-end
GB distance from the bottom of the keyway to the opposite surface of the shaft extension at N-end
GC distance from the top of the key to the opposite surface of the shaft extension at N-end
*GD height of the key of the shaft extension at D-end
*GE depth of the keyway at the crown of the shaft extension at D-end
GF height of the key of the shaft extension at N-end
GH depth of the keyway at the crown of the shaft extension at N-end
*H distance form the centre-line of the shaft to the bottom of the feet (basic dimension)
H´ distance from the centre-line of the shaft to the mounting surface – e.g. the bottom of the feet – in the
feet-up version
HA thickness of the feet
HC distance from the top of the horizontal machine to the bottom of the feet
HD distance from the top of the lifting eye, the terminal box or other most salient part mounted on the top of
the machine to the bottom of the feet
HE distance from the mounting surface to the lowest part of the machine
*K diameter of the holes or width of the slots (end view) in the feet of the machine
KA in case of longholes: width of the slots (side view) in the feet
L overall length of the machine with a single shaft extension
LA thickness of the flange
LB distance from the mounting surface of the flange to the end of the machine
LC overall length of the machine when there is a shaft extension at N-end
LR distance from the end of the machine to the ring bolt
*M pitch circle diameter of the fixing holes
*N diameter of the spigot
*P outside diameter of the flange, or in the case of a non-circular outline twice the maximum radial
dimension
*R distance from the mounting surface of the flange to the shoulder on the shaft
*S diameter of the fixing holes in the mounting flange or nominal diameter of thread
SR thread diameter of ring bolt
*T depth of the spigot
NOTE The definition of D-end and N-end of a motor is given in IEC 60034-7.
4.2 Dimensional sketches
a
This ISO symbol indicates the projection (see ISO 128-3) method used.
Figure 1 – Dimensional sketches
5 Designations of machines
5.1 Foot-mounted machines
Foot-mounted electrical machines can be designated by the frame size with additional
information of the mounting and shaft dimensions. The frame sizes are defined as the distance
from the centre line of the shaft to the bottom of the feet (H or H´ dimension).
H (A/B/C) D/E
H´ (A/B/C) D/E
EXAMPLE 710 (1180/1800/280) 130/120
5.2 Flange-mounted machines
The flange-mounted machines can be designated using the flange dimensions as the pitch circle
diameter M, the diameter and the numbers of the fixing holes and the shaft dimensions. The
dimensions for M and the correlation to the fixing dimensions (N, P, R, S and T) are given in
Table 3. The location of the holes in the mounting flange are shown in Figure 1.
NOTE Depending on the application, the size of the motor and mechanical conditions, it can be necessary to support
the machine additionally on the non-drive end side. This will be clarified on a project specific basis.
Recommended designations for flanges:
FF M (number of holes / S) D/E – For flange with spigot
FD M (number of holes / S) D/E – For flange without spigot
EXAMPLE
FF1500 (12/28) 130/200
5.3 Foot- and flange mounted machines
Combine 4.1 and 4.2 as follows:
H(A/B/C) FF M (number of holes / S) D/E
5.4 Shaft extension
The designation of the shaft is defined with the diameter of the shaft extension D and the length
of the shaft extension E. The dimensions for D and the correlation to the relevant dimensions
(e.g. E, key) are given in Table 4.
6 Fixing dimensions
6.1 Foot-mounted machines
Dimensions H, A, B shall be selected from values given in Table 1 and Table 2.
The values for C dimensions in millimeters (mm) shall be selected from the following list
(independent of shaft-height):
0 100 200 224 250 280 315 335 355 375 400 425 450 475 500 530
560 600 630 670 710 750 800 900 1 000
The values are taken from the R40 series of ISO 3. To comply with IEC 60072-1 for H = 355,
the value 254 for C should be used instead of 250.
The tolerances of the dimensions A, B and C are taken from the coarse series in ISO 2768-1.
Table 1 – Dimensions H and A
Dimensions in millimeters
H Values for A
355 450 475 500 530 560 610 630 670 710 750 800 850 900
400 500 530 560 600 630 686 710 750 800 850 900 950 1 000
450 560 600 630 670 710 750 800 850 900 950 1 000 1 060 1 120
500 630 670 710 750 800 850 900 950 1 000 1 060 1 120 1 180 1 250
560 710 750 800 850 900 950 1 000 1 060 1 120 1 180 1 250 1 320 1 400
630 800 850 900 950 1 000 1 060 1 120 1 180 1 250 1 320 1 400 1 500 1 600
710 900 950 1 000 1 060 1 120 1 180 1 250 1 320 1 400 1 500 1 600 1 700 1 800
800 1 000 1 060 1 120 1 180 1 250 1 320 1 400 1 500 1 600 1 700 1 800 1 900 2 000
900 1 120 1 180 1 250 1 320 1 400 1 500 1 600 1 700 1 800 1 900 2 000 2 120 2 240
1 000 1 250 1 320 1 400 1 500 1 600 1 700 1 800 1 900 2 000 2 120 2 240 2 360 2 500
NOTE 1 For machines with feet up, preferred H' dimension is 0, 160, 250, 315, 400, 500, 630, 800.
NOTE 2 For machines with feet up, A dimensions can be chosen from the lines corresponding to the shaft height
H that the machine would have with feet down. This normally corresponds to the Renard number equal or nearest
higher to the distance from the shaft center line to the lowest point of the machin
NOTE 3 Values for A dimension are taken from R40 series with the exception of values 610 mm and 686 mm.
NOTE 4 The values given in IEC 60072-1 are printed in italics.
Table 2 – Dimension H and B
H Values for B
mm mm
355 280 315 355 400 450 500 560 630 710 800 900 1 000 1 120
400 315 355 400 450 500 560 630 710 800 900 1 000 1 120 1 250
450 355 400 450 500 560 630 710 800 900 1 000 1 120 1 250 1 400
500 400 450 500 560 630 710 800 900 1000 1 120 1 250 1 400 1 600
560 450 500 560 630 710 800 900 1 000 1120 1 250 1 400 1 600 1 800
630 500 560 630 710 800 900 1 000 1 120 1250 1 400 1 600 1 800 2 000
710 500 560 630 710 800 900 1 000 1 120 1 250 1400 1 600 1 800 2 000 2 240
800 500 560 630 710 800 900 1 000 1 120 1 250 1 400 1600 1 800 2 000 2 240 2 500
900 500 560 630 710 800 900 1 000 1 120 1 250 1 400 1 600 1800 2 000 2 240 2 500 2 800
1 000 500 560 630 710 800 900 1 000 1 120 1 250 1 400 1 600 1 800 2000 2 240 2 500 2 800 3 150
NOTE 1 For machines with feet up, B dimensions can be chosen from the lines corresponding to the shaft height H that the machine would have had with feet down. This normally
corresponds to the Renard number equal or nearest higher to the distance from the shaft center line to the lowest point of the machine.
NOTE 2 Values for B dimensions are taken from the Renard series R20. Other values of B than those given in Table 2 can be used, provided they are taken from the R20 series.
NOTE 3 Values for A dimension are taken from R40 series with the exception of values 610 mm and 686 mm
NOTE 4 The values given in IEC 60072-1 are printed in italics.
6.2 Flange-mounted machines
Machines having both feet and flange shall have A, B and C dimensions selected from 6.1.
Dimensions for flanges are shown in Table 3.
Table 3 – Dimensions and tolerances for flanges with
pitch circle diameters from 1 180 mm to 2 360 mm
a b c
Flange P Number
M N R
number of holes
f
d e
Concentricity
S T
(FF/FD)
and
perpendi-
cularity
- mm mm mm max. mm - mm mm mm max.
max.
1 180 1 180 1 120 1 250 0 8 or 16 28 (M24) 7 0,2
0,2
1 320 1 320 1 250 1 400 0 8 or 16 28 (M24) 8
1 500 1 500 1 400 1 600 0 12 or 24 28 (M24) 8 0,2
1 700 1 700 1 600 1 800 0 12 or 24 28 (M24) 9 0,25
1 900 1 900 1 800 2 000 0 12 or 24 35 (M30) 9 0,25
2 120 2 120 2 000 2 240 0 12 or 24 35 (M30) 10 0,25
2 360 2 360 2 240 2 500 0 16 or 32 35 (M30) 10 0,315
a
Holes S are in the true position in reference to nominal M dimension (true concentric with datum circle N), with
tolerance Øt = 2 mm for S = 28 mm and Øt = 2,5 mm for S = 35 mm specified in ISO 1101 for Øt.
b
Tolerance h8. By agreement, a reduced tolerance (e.g. h6) may be applied. The spigot bore tolerance will be
H9 with h8 and H7 with h6.
c
R = 0, unless otherwise agreed between the manufacturer and the purchaser.
d
The nominal free hole dimensions are selected from the coarse series in ISO 273 and have the tolerance of
H17 according to ISO 286 series. Closed or open slots are allowed. By agreement, a reduced tolerance zone
H14 may be applied.
e
The corner radius between spigot and flange face should not exceed 0,8 mm and the chamfer towards the
spigot face should be designed in such a way that an adequate length of the cylindrical spigot section is
provided.
f
Concentricity defined in ISO 1101 of spigot to shaft and perpendicularity of flange-face to shaft. The values are
the maximum permissible change in indicator reading measured according to the methods in 8.2 and 8.3. By
agreement, values may be reduced to 50 % of the figures tabled.
7 Shaft end dimensions and tolerances
Table 4 shows the relevant dimensions for shafts, keys and keyways.
Table 4 – Dimensions and tolerances for shaft ends
a b
Diameter D / Key Keyway
Length Runout
(DA)
d
E(EA) Width Height Width Depth
GA
F(FA) GD(GF) F(FA) GE(GH)
(GC)
mm ISO Long Short µm mm mm mm mm mm
tol. series series
c
ISO tol. ISO tol.
ISO tol. N9
mm mm h9 h11
90 m6 170 130 70 25 14 25 9 95
95 m6 170 130 70 25 14 25 9 100
100 m6 210 165 70 28 16 28 10 106
110 m6 210 165 70 28 16 28 10 116
120 m6 210 165 70 32 18 32 11 127
125 m6 210 165 80 32 18 32 11 132
m6 250 200 80 32 18 11 137
130 32
140 m6 250 200 80 36 20 36 12 148
150 m6 250 200 80 36 20 36 12 158
160 m6 300 240 80 40 22 40 13 169
170 m6 300 240 80 40 22 40 13 179
180 m6 300 240 80 45 25 45 15 190
190 m6 350 280 90 45 25 45 15 200
200 m6 350 280 90 45 25 45 15 210
220 m6 350 280 90 50 28 50 17 231
a
The shaft length dimension is subject to a tolerance of –0,5 mm on all sizes.
b
The values for shaft extension run out are the maximum permissible change in indicator reading measured
according to the method in 8.1. By agreement, values may be reduced to 50 % of the figures tabled.
c
The keyway tolerance N9 applies for normal keys, P9 is applicable for fitted keys by agreement.
d
Tolerances for GA can be calculated from values of the other dimensions given in Table 4.
8 Methods of measurement
8.1 Shaft extensions run out
Apply the point of the indicator to the shaft, midway along its length as shown in Figure 2. Read
the maximum and minimum values on the indicator through one slow revolution of the shaft.
The difference between the readings shall not exceed the value given in Table 4.
The test may be carried out with the motor set up in either a horizontal or vertical position and
with the indicator fixed directly to it or mounted on a common surface plate supporting both
motor and indicator similar to that shown in Figure 2.
Figure 2 – Illustration of the measurement of shaft extensions runout
8.2 Concentricity of spigot and shaft
Fix the indicator rigidly on the shaft extension, by means of a device similar to that shown in
Figure 3, at a distance of about 10 mm from the mounting face of the flange. Read the maximum
and minimum values on the indicator through one slow revolution of the shaft. The difference
between the extreme readings of the concentricity test indicator shall not exceed the values
given in Table 3.
NOTE The test can be carried out on the machine set up with the shaft vertical so as to make the measurement
free from the effect of gravity.
Figure 3 – Illustration of the measurement of concentricity
8.3 Perpendicularity of mounting face of flange to shaft
Fix the indicator rigidly on the shaft extension, by means of a device similar to that shown in
Figure 4, at a distance of about 10 mm from the mounting face of the flange. Read the maximum
and minimum values on the indicator through one slow revolution of the shaft.
The difference between the extreme readings of the perpendicularity indicator shall not exceed
the values given in Table 3.
NOTE The test can be carried out on the machine set up with shaft vertical so as to eliminate the axial clearance
in the bearing.
Figure 4 – Illustration of the measurement of perpendicularity
9 Preferred rated output values
The values in kilowatts (kW) are taken from the R40 series of ISO 3:
280 300 315 335 355 375 400 425 4
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