IEC 60915:2006

Capacitors and resistors for use in electronic equipment - Preferred dimensions of shaft ends, bushes and for the mounting of single-hole, bush-mounted, shaft-operated electronic components

IEC 60915:2006 contains preferred dimensions for shaft ends and bushes and for the mounting of single-hole, bush-mounted, shaft-operated variable capacitors, variable resistors and potentiometers. If other dimensions not listed in this standard have to be used, it is recommended to select them also from IEC 60390 and IEC 60620. This second edition cancels and replaces the first edition published in 1987 and constitutes a minor revision, related to tables, figures and references. This bilingual version, published in 2008-07, corresponds to the English version. The contents of the corrigendum of December 2008 have been included in this copy.

Condensateurs et résistances utilisés dans les équipements électroniques - Dimensions préférentielles concernant les terminaisons des axes, les canons et le montage par le canon sur trou unique des composants électroniques munis d'un axe de commande

La CEI 60915:2006 contient les dimensions préférentielles concernant les terminaisons des axes, les canons et le montage par le canon sur trou unique de condensateurs variables, de résistances et de potentiomètres variables munis d'un axe de commande. Si d'autres dimensions non indiquées dans la présente norme doivent être utilisées, il est recommandé de les sélectionner aussi dans les normes CEI 60390 et la CEI 60620. Cette seconde édition annule et remplace la première édition publiée en 1987. Elle constitue une révision mineure des tableaux, valeurs et références. La présente version bilingue, publiée en 2008-07, correspond à la version anglaise. Le contenu du corrigendum de décembre 2008 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 27-Nov-2006
• ICS: 31.040.01 - Resistors in general
• ICS: 31.060.01 - Capacitors in general
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Current Stage: PPUB - Publication issued
• Start Date: 28-Nov-2006
• Completion Date: 31-Dec-2006

Relations

• Corrected By: IEC 60915:2006/COR2:2008 - Corrigendum 2 - Capacitors and resistors for use in electronic equipment - Preferred dimensions of shaft ends, bushes and for the mounting of single-hole, bush-mounted, shaft-operated electronic components
• Effective Date: 05-Sep-2023
• Corrected By: IEC 60915:2006/COR1:2007 - Corrigendum 1 - Fixed capacitors for use in electronic equipment - Preferred dimensions of shaft ends, bushes and for the mounting of single-hole, bush-mounted, shaft-operated electronic components
• Effective Date: 05-Sep-2023

Overview

IEC 60915:2006 - "Capacitors and resistors for use in electronic equipment – Preferred dimensions of shaft ends, bushes and for the mounting of single‑hole, bush‑mounted, shaft‑operated electronic components" - defines preferred mechanical dimensions for shaft ends, bushes and panel mounting of shaft‑operated variable capacitors, variable resistors and potentiometers. This second edition (2006, bilingual copy published 2008 with corrigendum included) provides standardized shaft dimensions, mounting cut‑outs, and related component interface details to improve interchangeability and panel design.

Key topics and technical requirements

• Shaft types and profiles: preferred dimensions for plain round, flatted, slotted and concentric shafts (see sections 3.1–3.4).
• Mounting details: recommended single‑hole, bush‑mounted mounting geometry including anti‑rotation lugs, panel cut‑outs and minimum panel thickness (section 4).
• Component interface parts: preferred dimensions and options for bushes, fixing (mounting) nuts and washers (flat, spring, internal tooth).
• Tables and figures: the standard contains detailed tables and figures listing preferred sizes, tolerances, finish requirements and options for knobs (screwed/push‑on), lug angles and chamfer/radius recommendations.
• Units and format: dimensions are given in millimetres; normative references to related IEC documents are required for full application.

Practical applications and users

IEC 60915 is practical for:

• Component manufacturers (potentiometers, trimmers, variable capacitors/resistors) - to design shaft and bush geometry that matches common panels and knobs.
• Panel and enclosure designers - to specify accurate panel cut‑outs and anti‑rotation features for single‑hole bush mounting.
• Assembly and product engineers - to select compatible fixing nuts, washers and knob mounting types (screwed or push‑on).
• Purchasing and quality teams - to verify mechanical interchangeability and reduce custom tooling or rework.

Benefits include improved mechanical compatibility, reduced design iterations, and easier sourcing of compliant parts for electronic equipment.

Related standards

• IEC 60390 - Dimensions of spindle ends for manually operated electronic components (broader range of spindle options).
• IEC 60620 - Dimensions for the mounting of single‑hole, bush‑mounted, spindle‑operated components.
  IEC 60915 recommends selecting additional sizes from IEC 60390 and IEC 60620 when dimensions fall outside its preferred list.

Keywords: IEC 60915, shaft dimensions, bush‑mounted, potentiometer, variable resistor, variable capacitor, mounting dimensions, panel cut‑out, shaft ends, preferred dimensions.

Standards Content (Sample)

IEC 60915
Edition 2.0 2006-11
INTERNATIONAL
STANDARD
Capacitors and resistors for use in electronic equipment – Preferred dimensions
of shaft ends, bushes and for the mounting of single-hole, bush-mounted,
shaft-operated electronic components

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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IEC 60915
Edition 2.0 2006-11
INTERNATIONAL
STANDARD
Capacitors and resistors for use in electronic equipment – Preferred dimensions
of shaft ends, bushes and for the mounting of single-hole, bush-mounted,
shaft-operated electronic components

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 31.040; 31.060 ISBN 2-8318-8916-2

– 2 – 60915 © IEC:2006(E)
CONTENTS
FOREWORD.3

1 Scope and object.5

2 Normative references .5

3 Preferred dimensions of shaft ends and bushes .5

3.1 Plain round shaft .6

3.2 Flatted shaft .7

3.3 Slotted shaft.8
3.4 Concentric shafts .9
4 Preferred dimensions for the mounting of single-hole, bush mounted shaft -
operated electronic components .10
4.1 Single-hole bush mounting with antirotation lug (non-turn device) on
mounting face.10
4.2 Single and double flatted bush mounting .13
4.3 Single-hole bush mounting with antirotation lug (non-turn device) on bush .14
4.4 Fixing (or mounting) nuts.15
4.5 Washers (flat, spring and internal tooth) .15

Figure 1 – Plain round shaft.6
Figure 2 – Flatted shaft.7
Figure 3 – Slotted shaft.8
Figure 4 – Concentric shaft.9
Figure 5 – Essential component dimensions .10
Figure 6 – Essential panel cut-out dimensions .11
Figure 7 – Essential component dimensions .13
Figure 8 – Essential panel cut-out dimensions .13
Figure 9 – Essential component dimensions .14
Figure 10 – Essential panel cut-out dimensions .14
Figure 11 – Fixing (or mounting) nuts.15

Table 1 – Preferred dimensions of plain round shaft .6

Table 2 – Preferred dimensions of flatted shaft .7
Table 3 – Preferred dimensions of slotted shaft .8
Table 4 – Preferred dimensions of concentric shafts .9
Table 5 – Preferred dimensions of bush, lug (non-turn device) and related place .12
Table 6 – Preferred dimensions of bush and mounting hole .13
Table 7 – Preferred dimensions of bush, lug (non-turn device) and mounting hole .14
Table 8 – Preferred dimensions of fixing (or mounting) nuts.15

60915 © IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
CAPACITORS AND RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –

PREFERRED DIMENSIONS OF SHAFT ENDS, BUSHES

AND FOR THE MOUNTING OF SINGLE-HOLE, BUSH-MOUNTED,

SHAFT-OPERATED ELECTRONIC COMPONENTS

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, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60915 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This second edition cancels and replaces the first edition published in 1987 and constitutes a
minor revision, related to Tables, Figures and references.
The text of this standard is based on the following documents:
CDV Report on voting
40/1654/CDV 40/1783/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 60915 © IEC:2006(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or

• amended.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum 2 of March 2008 have been included in this copy. It
cancels and replaces the corrigendum 1 of May 2007.

60915 © IEC:2006(E) – 5 –
CAPACITORS AND RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –

PREFERRED DIMENSIONS OF SHAFT ENDS, BUSHES

AND FOR THE MOUNTING OF SINGLE-HOLE, BUSH-MOUNTED,

SHAFT-OPERATED ELECTRONIC COMPONENTS

1 Scope and object
This International Standard is applicable to variable capacitors, potentiometers and variable
resistors for use in electronic equipment.
The dime
...

IEC 60915
Edition 2.0 2006-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Capacitors and resistors for use in electronic equipment – Preferred dimensions
of shaft ends, bushes and for the mounting of single-hole, bush-mounted,
shaft-operated electronic components

Condensateurs et résistances utilisés dans les équipements électroniques –
Dimensions préférentielles concernant les terminaisons des axes, les canons et
le montage par le canon sur trou unique des composants électroniques munis
d'un axe de commande
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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Switzerland
Email: [e-mail]
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
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IEC 60915
Edition 2.0 2006-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Capacitors and resistors for use in electronic equipment – Preferred dimensions
of shaft ends, bushes and for the mounting of single-hole, bush-mounted,
shaft-operated electronic components

Condensateurs et résistances utilisés dans les équipements électroniques –
Dimensions préférentielles concernant les terminaisons des axes, les canons et
le montage par le canon sur trou unique des composants électroniques munis
d'un axe de commande
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
P
CODE PRIX
ICS 31.040; 31.060 ISBN 2-8318-9839-0
– 2 – 60915 © IEC:2006
CONTENTS
FOREWORD.3
1 Scope and object.5
2 Normative references .5
3 Preferred dimensions of shaft ends and bushes .5
3.1 Plain round shaft .6
3.2 Flatted shaft .7
3.3 Slotted shaft.8
3.4 Concentric shafts .9
4 Preferred dimensions for the mounting of single-hole, bush mounted, shaft -
operated electronic components .10
4.1 Single-hole bush mounting with antirotation lug (non-turn device) on
mounting face.10
4.2 Single and double flatted bush mounting .13
4.3 Single-hole bush mounting with antirotation lug (non-turn device) on bush .14
4.4 Fixing (or mounting) nuts.15
4.5 Washers (flat, spring and internal tooth) .15

Figure 1 – Plain round shaft.6
Figure 2 – Flatted shaft.7
Figure 3 – Slotted shaft.8
Figure 4 – Concentric shaft.9
Figure 5 – Essential component dimensions .10
Figure 6 – Essential panel cut-out dimensions .11
Figure 7 – Essential component dimensions .13
Figure 8 – Essential panel cut-out dimensions .13
Figure 9 – Essential component dimensions .14
Figure 10 – Essential panel cut-out dimensions .14
Figure 11 – Fixing (or mounting) nuts.15

Table 1 – Preferred dimensions of plain round shaft .6
Table 2 – Preferred dimensions of flatted shaft .7
Table 3 – Preferred dimensions of slotted shaft .8
Table 4 – Preferred dimensions of concentric shafts .9
Table 5 – Preferred dimensions of bush, lug (non-turn device) and related place .12
Table 6 – Preferred dimensions of bush and mounting hole .13
Table 7 – Preferred dimensions of bush, lug (non-turn device) and mounting hole .14
Table 8 – Preferred dimensions of fixing (or mounting) nuts.15

60915 © IEC:2006 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CAPACITORS AND RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –
PREFERRED DIMENSIONS OF SHAFT ENDS, BUSHES AND
FOR THE MOUNTING OF SINGLE-HOLE, BUSH-MOUNTED,
SHAFT-OPERATED ELECTRONIC COMPONENTS

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, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60915 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This second edition cancels and replaces the first edition published in 1987 and constitutes a
minor revision, related to tables, figures and references.
This bilingual version, published in 2008-07, corresponds to the English version.
The text of this standard is based on the following documents:
CDV Report on voting
40/1654/CDV 40/1783/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 60915 © IEC:2006
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of December 2008 have been included in this copy.

60915 © IEC:2006 – 5 –
CAPACITORS AND RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –
PREFERRED DIMENSIONS OF SHAFT ENDS, BUSHES AND
FOR THE MOUNTING OF SINGLE-HOLE, BUSH-MOUNTED,
SHAFT-OPERATED ELECTRONIC COMPONENTS

1 Scope and object
This International Standard is applicable to variable capacitors, potentiometers and variable
resistors for use in electronic equipment.
The dimensions given in this standard have been selected from IEC 60390 and IEC 60620
because the ranges of dimensions included in these standards were considered too large and
contained too many variants for capacitors and resistors for electronic equipment.
Consequently this standard contains preferred dimensions for shaft ends and bushes and for
the mounting of single-hole, bush-mounted, shaft-operated variable capacitors, variable
resistors and potentiometers. If other dimensions not listed in this standard have to be used, it
is recommended to select them also from the above-mentioned standards.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60390, Dimensions of spindle ends for manually operated electronic components
IEC 60620, Dimensions for the mounting of single-hole, bush-mounted, spindle-operated
electronic components
3 Preferred dimensions of shaft ends and bushes
All dimensions are in mm.
– 6 – 60915 © IEC:2006
3.1 Plain round shaft
B
Mounting
face
A
a
Clip
a
Chamfer at 40°/50° or a radius for a depth of between 5 % and 10 % of the dimension A

Figure 1 – Plain round shaft
Table 1 – Preferred dimensions of plain round shaft
a
Dimension A Dimension B
General Precision 10 12,5 15 20 22 25 30 32 35 40 50
±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±1,0 ±1,0 ±1,0 ±1,0 ±1,0
0 0
X X X X X X X X
3,0 3,00
−0,06 −0,025
0 0
4,0 4,00 X X X X X X X X X X X
−0,075 −0,03
0 0
b
X X X X X X X X X X
6,0 6,00
−0,075 −0,03
0 0
10,0 10,00  X X X X X X X X X
−0,09 −0,036
a
Dimension A includes finish requirements.
b
When specifically required, this variant may have a cross-hole, with a diameter of 3,15 mm ± 0,05 mm,
at 5 mm ± 0,4 mm from the end of the shaft. The centre line of the cross-hole shall not deviate from the
centre line of the shaft by more than 0,1 mm.

60915 © IEC:2006               – 7 –

3.2 Flatted shaft
B
Mounting
D
face
A
C
a
Clip
a
Chamfer at 40°/50°, or a radius for a depth of between 5 % and 10 % of dimension A.
Figure 2 – Flatted shaft
Table 2 – Preferred dimensions of flatted shaft
a b c,d
Dimension A Dimension B Dimension C Dimension D
General Precision 10 12.5 15 20 22 25 30 32 35 40 50 Screwed Push-on
knob knob
±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±1,0 ±1,0 ±1,0 ±1,0 ±1,0

0 0 0 0
X X X X X X X X  From 4 mm in
3,00 3,00 2,5 2,0
−0,06 −0,025 −0,1 −0,1
increments of
2 mm
0 0 0 0
X X X X X X X X X X (4,6,8,12 mm)
4,00 4,00 3,5 3,0
−0,075 −0,03 −0,1 −0,1
Tolerance
0 0 0
4,0
X X X X X X X X X X
6,00 6,00 5,0 ±0,5 mm
−0,1
−0,75 −0,03 −0,2
4,5
−0,2
0 0 0 0
X X X X X X X X
10,0 10,0 9,0 7,0
−0,09 −0,036 −0,2 −0,1
a
Dimension A includes finish requirements.
b
If additional values are required, they should preferably be chosen from the R20 series.
c
Dimensions C and D of the flat shall be selected from the options given in Table 2 and dimension D shall be specified in the detail specification
of the component in consideration of the diameter and length of shaft.
d
The angle of flat shall be specified in steps of 22,5° ± 5° clockwise from the reference line (the position of the reference line shall be defined).

– 8 –                   60915 © IEC:2006

3.3 Slotted shaft
B
Mounting
face
F
A E
a
Clip
Figure 3 – Slotted shaft
Table 3 – Preferred dimensions of slotted shaft
a b
Dimension A Dimension B Dimension E Dimension F
General Precision 10 12,5 15 20 22 25 30 32 35 40 50
±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±1,0 ±1,0 ±1,0 ±1,0 ±1,0
0,6 ± 0,1 1,0 ± 0,1
0 0
3,00 3,00 X X X X X X X X
−0,06 −0,025
1,0 ± 0,1 1,2 ± 0,2
0,8 ± 0,1 1,2 ± 0,2
0 0
4,00 4,00 X X X X X X X X X
−0,075 −0,03
1,0 ± 0,1 1,5 ± 0,2
1,0 ± 0,1 1,6 ± 0,2
0 0
X X X X X X X X X
6,00 6,00
−0,075 −0,03
2,0 ± 0,2
0 0
X X X X X X X X
10,0 10,00 2,0 ± 0,1 3,0 ± 0,2
−0,09 −0,036
a
Dimension A includes finish requirements.
b
If additional values are required they should preferably be chosen from the R20 series.

60915 © IEC:2006               – 9 –

3.4 Concentric shafts
B2
Mounting
B1
face
D2 D1
C2 A2
C1 A1
a
a
Clip
Figure 4 – Concentric shaft
Table 4 – Preferred dimensions of concentric shafts
b d c d
Dimension Dimension Dimension B1 B2 C1 C2 Dimensions
a c
A1 D1,D2
a
A2 10 12,5 15 20 22 25 30 32 35 40 50 Screwed Push-
knob
±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±0,5 ±1,0 ±1,0 ±1,0 ±1,0 ±1,0
on knob
B1 +
0 0 0
0 0
X X X X X X X X X 5,3 2,5 2,0 From 4 mm in
6,00 3,00
−0,3 −0,1 −0,1
−0,07 −0,06
increments of
10 ± 1,0
2 mm
NA
0 0 0 0
3,5 3,0
6,00 4,00  X X X X X X X X X
−0,1 −0,1 Tolerance of
−0,07 −0,075
± 0,5 mm
0 0 0
0 0
X X X X X X X X 9,0 5,0 4,0
10,0 6,00 B1 +
−0,2 −0,2 −0,1
−0,09 −0,075
12,5 ± 1,0 − 0 . 1
a
Dimension A includes finish requirements.
b
If additional values are required, they should preferably be chosen from the R20 series.
c
Dimensions C2, D1 and D2 of the flats shall be selected from the options given in Table 4.
d
The angle of flat shall be specified in steps of 22,5° ± 5° clockwise from the reference line (the position of the reference line shall be defined).
NA = Not applicable.
– 10 – 60915 © IEC:2006
4 Preferred dimensions for the mounting of single-hole, bush mounted, shaft -
operated electronic components
All dimensions are in mm.
4.1 Single-hole bush mounting with antirotation lug (non-turn device) on mounting
face
α
K
R
P
L
A
Thickness of clip and/or
thrust washer 1,5 mm max.
H
The angular position of the lug (α) shall be specified in the relevant detail specification of the component.
The minimal panel thickness shall be specified in the relevant detail specification of the component.
NOTE 1 Two symmetrical lugs may be used.
NOTE 2 The shape of the lug is optional within dimension P.
NOTE 3 If required by the relevant detail specification, the lug may be omitted, in which case the panel cut-out
would be simplified.
Figure 5 – Essential component dimensions

60915 © IEC:2006 – 11 –
α
R
J
M
The angular position of the lug (α) shall be specified in the relevant detail specification of the component.
The minimal panel thickness shall be specified in the relevant detail specification of the component.
NOTE 1 Two symmetrical lugs may be used.
NOTE 2 The shape of the lug is optional within dimension P.
NOTE 3 If required by the relevant detail specification, the lug may be omitted, in which case the panel cut-out
would be simplified.
Figure 6 – Essential panel cut-out dimensions

– 12 – 60915 © IEC:2006
Table 5 – Preferred dimensions of bush, lug (non-turn device) and related place
Component Panel cut-out
Shaft Thread Bush Antirotation Dimensions Diameter Diameter of Hole
diameter designation length lug length of antirotation distance
mounting lug hole
hole
a b
A L H K P M J R
+0,12
9,5 ± 0,1
3,5
3 M5 × 0,5 5 ± 0,5 1,0 ± 0,2 5,1
6 ± 0.5
M6 × 0,75 7,1 Note 2
1,5 ± 0,2
c
8 ± 0,5
M7 × 0,75
+0,12
9,5 ± 0,1
3,5
4 M7 × 0,75 6 ± 0,5 1,0 ± 0,2 7,1
M8 × 0,75 8,1
8 ± 0,5 1,5 ± 0,2
2,0 ± 0,2
+0,12
9,5 ± 0,1
6 M7 × 0,75 7,1 3,5
5 ± 0,5 1,0 ± 0,2
M9 × 0,75 10,1
8 ± 0,5 1,5 ± 0,2 +0,12
4,5
13,5 ± 0,1
10 ± 0,5
M10 × 0,75
2,0 ± 0,2
12 ± 0,5
2,5 ± 0,2
+0,12
13,5 ± 0,1
10 M15 × 1,0 15,1 3,5
12 ± 0,5 1,0 ± 0,2
+0,12
1,5 ± 0,2
4,5
15,0 ± 0,1
2,0 ± 0,2
2,5 ± 0,2
a
Unless otherwise specified in the detail specification.
b
For potentiometers with a diameter less than 19 mm, the diameter R is given in the detail specification.
c
The relevant detail specification shall specify dimensions P and R in such a way that the angular tolerance does
not exceed ± 2,5° and that the mountability is ensured.

60915 © IEC:2006 – 13 –
4.2 Single and double flatted bush mounting

R
T
0,1
NOTE Dimensions A, L and H are given in Figure 5.
Figure 7 – Essential component dimensions
S
U
M
0,1
Figure 8 – Essential panel cut-out dimensions
Table 6 – Preferred dimensions of bush and mounting hole
Component Single flatted bush Double flatted bush
Shaft Thread Bush Diameter Bush Mounting Bush Mounting
diameter designation length of mount- dimension hole dimension hole
ing hole
dimension dimension
a
A L
H M R S T U
+0,09 0 +0,09
3 M6 × 0,75 6,1
5 ± 0,5 5,55 5,60 5,10 5,15
− 0,09 0 − 0,075 0
M7 × 0,75 7,1
8 ± 0,5
+0,09 +0,09
6,00
6,50
6,55 6,05
− 0,075
−0,09
0 0
0 +0,09 0 +0,09
M7 × 0,75 6 ± 0,5 7,1 6,50 6,55 6,00 6,05
− 0,09 0 − 0,075 0
M8 × 0,75 8,1
8 ± 0,5 0
+0,09 +0,09
7,40 6,80 6,85
7,45
− 0,075 0
− 0,09 0
0 +0,09 0 +0,09
6 M10 × 0,75 10,1
8 ± 0,5 9,25 9,30 8,50 8,55
−0,09 0 −0,09 0
12 ± 0,5
10 M15 × 1,0 15,1 Under consideration Under consideration
12 ± 0,5
The angular position of the flat(s) on the bush, with respect to the part of the component mounted behind the
panel, shall be specified in the relevant detail specification.
The double flatted bush is the preferred mounting. With this mounting, the angular play shall not exceed ±4°.
NOTE Dimensions A, L and H are given in Figure 5.
a
Unless otherwise specified in the detail specification.

– 14 – 60915 © IEC:2006
4.3 Single-hole bush mounting with antirotation lug (non-turn device) on bush

0,7 ± 0,2 mm
K
R
A L
Thickness of clip and/or
thrust washer 1,5 mm max.
H
Figure 9 – Essential component dimensions

S
U
M
The angular position of the antirotation lug on the bush, with respect to
...