SIST EN IEC 60120:2020

SLOVENSKI STANDARD
SIST EN IEC 60120:2020
01-december-2020
Nadomešča:
SIST HD 474 S1:1998
Betiči in ponvice za člene izolatorskih verig - Dimenzije (IEC 60120:2020)
Ball and socket couplings of string insulator units - Dimensions (IEC 60120:2020)
Maße von Klöppel-Pfannen-Verbindungen für Kettenisolatoren PREVERI NASLOV
Assemblages à rotule des éléments de chaînes d'isolateurs - Dimensions (IEC
60120:2020)
Ta slovenski standard je istoveten z: EN IEC 60120:2020
ICS:
29.080.10 Izolatorji Insulators
SIST EN IEC 60120:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60120:2020

---------------------- Page: 2 ----------------------
SIST EN IEC 60120:2020


EUROPEAN STANDARD EN IEC 60120

NORME EUROPÉENNE

EUROPÄISCHE NORM
September 2020
ICS 29.080.10; 29.240.20 Supersedes HD 474 S1:1986 and all of its amendments
and corrigenda (if any)
English Version
Ball and socket couplings of string insulator units - Dimensions
(IEC 60120:2020)
Assemblages à rotule des éléments de chaînes d'isolateurs To be completed
- Dimensions (IEC 60120:2020)
(IEC 60120:2020)
This European Standard was approved by CENELEC on 2020-08-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60120:2020 E

---------------------- Page: 3 ----------------------
SIST EN IEC 60120:2020
EN IEC 60120:2020 (E)
European foreword
The text of document 36/486/FDIS, future edition 4 of IEC 60120, prepared by IEC/TC 36 "Insulators"
was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60120:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-26
document have to be withdrawn

This document supersedes HD 474 S1:1986 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60120:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60305 NOTE Harmonized as EN 60305
IEC 60383-1 NOTE Harmonized as EN 60383-1
IEC 60433 NOTE Harmonized as EN 60433
IEC 61325 NOTE Harmonized as EN 61325


2

---------------------- Page: 4 ----------------------
SIST EN IEC 60120:2020
EN IEC 60120:2020 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-471 2007 International Electrotechnical Vocabulary - - -
Part 471: Insulators
IEC 60372 -  Locking devices for ball and socket - -
couplings of string insulator units -
Dimensions and tests


3

---------------------- Page: 5 ----------------------
SIST EN IEC 60120:2020

---------------------- Page: 6 ----------------------
SIST EN IEC 60120:2020



IEC 60120

®


Edition 4.0 2020-07




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Ball and socket couplings of string insulator units – Dimensions



Assemblages à rotule des éléments de chaînes d’isolateurs – Dimensions


















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.080.10; 29.240.20 ISBN 978-2-8322-8475-9




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------
SIST EN IEC 60120:2020
– 2 – IEC 60120:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Designated size of coupling . 7
5 Pin ball . 7
6 Socket . 7
7 Hook-on "GO" gauge . 7
8 Lower part of the insulator . 7
9 Locking device . 7
10 Dimensions of the pin ball. 8
11 Dimensions of the socket end . 9
12 Dimensions of the hook-on "GO" gauge . 10
13 Dimensions of twin-balled pins . 13
14 Dimensions of the hole for the split-pin . 13
15 Dimensions of the hole for the W-clip . 15
Annex A (informative) Extreme positions of the pin ball in the socket . 16
Annex B (normative) Recommended gauges . 18
Annex C (informative) Dimensions obtained by calculation. 35
Bibliography . 37

Figure 1 – Schematic of the pin ball . 8
Figure 2 – Schematic of the socket end . 9
Figure 3 – Schematic of the hook-on "GO" gauge . 10
Figure 4 – Schematic of twin-balled pins . 13
Figure 5 – Schematic of the hole for the split-pin . 14
Figure 6 – Schematic of the hole for the W-clip . 15
Figure A.1 – Sliding position of the pin ball (socket end) . 16
Figure A.2 – Over-tilting position of the pin ball in the socket end . 17
Figure B.1 – Schematic of ball part for pin ball . 19
Figure B.2 – Schematic of inspecting part for cap . 19
Figure B.3 – Schematic of pin "GO" gauge for ball height, shank diameter and shank
length . 20
Figure B.4 – Schematic of pin "GO" gauge for ball diameter . 22
Figure B.5 – Schematic of pin "NOT GO" gauge for ball height . 23
Figure B.6 – Schematic of pin "NOT GO" gauge for ball diameter . 25
Figure B.7 – Schematic of pin "NOT GO" gauge for shank diameter . 26
Figure B.8 – Schematic of socket "GO" gauge for entry height, entry width and neck
width . 27
Figure B.9 – Schematic of socket "GO" gauge for internal height and internal diameter . 29
Figure B.10 – Schematic of socket "NOT GO" gauge for entry height . 32
Figure B.11 – Schematic of socket "NOT GO" gauge for neck width . 34

---------------------- Page: 8 ----------------------
SIST EN IEC 60120:2020
IEC 60120:2020 © IEC 2020 – 3 –
Figure C.1 – Schematic of clearance between the pin ball and the socket end . 35
Figure C.2 – Effectiveness of locking the pin ball . 36

Table 1 – Dimensions of the pin ball . 8
Table 2 – Dimensions of the socket end . 9
Table 3 – Dimensions of the hook-on "GO" gauge . 11
Table 4 – Dimensions of twin-balled pins . 13
Table 5 – Dimensions of the hole for the split-pin . 14
Table 6 – Dimensions of the hole for the W-clip . 15
Table A.1 – Allowed deviation angle of pin . 16
Table A.2 – Allowed deviation angle of pin . 17
Table B.1 – Dimensions of pin "GO" gauge for ball height, shank diameter and shank
length . 21
Table B.2 – Dimensions of pin "GO" gauge for ball diameter . 23
Table B.3 – Dimensions of pin "NOT GO" gauge for ball height . 24
Table B.4 – Dimensions of pin "NOT GO" gauge for ball diameter . 25
Table B.5 – Dimensions of pin "NOT GO" gauge for shank diameter . 26
Table B.6 – Dimensions of socket "GO" gauge for entry height, entry width and neck
width . 27
Table B.7 – Dimensions of socket "GO" gauge for internal height and internal diameter. 30
Table B.8 – Dimensions of socket "NOT GO" gauge for entry height . 32
Table B.9 – Dimensions of socket "NOT GO" gauge for neck width . 34
Table C.1 – Clearance between the pin ball and the socket end . 35
Table C.2 – Effectiveness of locking the pin ball . 36

---------------------- Page: 9 ----------------------
SIST EN IEC 60120:2020
– 4 – IEC 60120:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

BALL AND SOCKET COUPLINGS OF STRING
INSULATOR UNITS – DIMENSIONS

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60120 has been prepared by IEC technical committee 36:
Insulators.
This fourth edition cancels and replaces the third edition published in 1984. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Two new designated size of couplings, 36 and 40 were introduced;
b) According to the results of the questionnaire(36/424/Q), the relevant content of the 28B
W-clip was deleted;
column in Table C.1 was deleted;
c) The Q
min
d) Annex A is informative, Annex B is normative, Annex C is informative.

---------------------- Page: 10 ----------------------
SIST EN IEC 60120:2020
IEC 60120:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
36/486/FDIS 36/492/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

---------------------- Page: 11 ----------------------
SIST EN IEC 60120:2020
– 6 – IEC 60120:2020 © IEC 2020
BALL AND SOCKET COUPLINGS OF STRING
INSULATOR UNITS – DIMENSIONS



1 Scope
The object of this international standard is to define the dimensions of a series of standard
ball and socket couplings using the standard locking devices (see IEC 60372) in order to
permit the assembly of insulators or metal fittings supplied by different manufacturers.
This document applies to string insulator units of the cap and pin and long rod types and their
associated metal fittings.
For the pin ball and the socket, dimensions apply to the finished product after any surface
treatment.
Extreme positions of the pin ball in the socket are given in Annex A.
Typical examples of gauges for checking the dimensions of pin balls and sockets are given in
Annex B.
NOTE Only the dimensions necessary for assembly are dealt with in this standard. Properties of material and
working loads are not specified. The co-ordination of dimensions with strength classes is specified in IEC 60305
and IEC 60433.
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.
IEC 60050-471:2007, International Electrotechnical Vocabulary (IEV) – Part 471: Insulators
IEC 60372, Locking devices for ball and socket couplings of string insulator units –
Dimensions and tests
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60050-471, some of
which are reproduced below for ease of reference, apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
ball and socket coupling
coupling consisting of a ball, a socket and a locking device, and providing flexibility
[SOURCE: IEC 60050-471:2007, 471-03-11]

---------------------- Page: 12 ----------------------
SIST EN IEC 60120:2020
IEC 60120:2020 © IEC 2020 – 7 –
3.2
string insulator unit
cap and pin insulator or long rod insulator of which end fitting are suitable for flexible
attachment to other similar insulator units or to connecting accessories
[SOURCE: IEC 60050-471:2007, 471-03-08]
4 Designated size of coupling
This document includes eight standard ball and socket couplings designated by the nominal
pin diameters in millimetres. Each designated size of coupling is defined by the dimensions of
the pin ball, of the socket, of the hook-on "GO" gauge, of the lower part of the insulator and of
the corresponding locking device.
NOTE Dimensions of twin-balled pins for coupling of two sockets are stated in Clause 13. Dimensions of the hole
for the locking devices are stated in Clause 14 and Clause 15.
5 Pin ball
The pin ball shall conform to the dimensions specified in Clause 10. The main dimensions
governing the shape of the pin ball are h , d , r and r . Dimension r is given for guidance
1 2 1 2 3
because its accurate value may be obtained only by the drawing. In addition, the shank
diameter d , must not exceed the specified values within a length equal to H of the
1 3
corresponding worn hook-on "GO" gauge (see Clause 12).
6 Socket
The socket interior shall conform to the dimensions specified in Clause 11, which also
specifies the thickness of the locking device.
The 16 mm designated size of coupling according to Clause 11 includes two alternative
sockets. There is only one type of pin ball fit for it, but the corresponding locking device
should be used. That is, the 16A socket should be matched with the 16A locking device, the
16B socket should be matched with the 16B locking device.
NOTE Sockets according to the clause mentioned are shown with flat bottoms. Sockets with rounded bottoms with
radii of curvature not less than the dimensions r of the pin balls can also be used. In this case, the dimensions R
2 5
have to be correspondingly decreased.
7 Hook-on "GO" gauge
The external dimensions of the socket have not been laid down. However, the socket shall
permit acceptance of the hook-on "GO" gauge according to Clause 12.
8 Lower part of the insulator
The shape of the lower part of the insulator shall be such that assembly with the socket of
maximum external dimensions according to Clause 7 will always be possible.
9 Locking device
The locking device, i. e. a split-pin or W-clip, shall be designed for locking the minimum-size
pin ball in the maximum size socket. This requirement is fulfilled if the locking devices
standardized in IEC 60372 are used.

---------------------- Page: 13 ----------------------
SIST EN IEC 60120:2020
– 8 – IEC 60120:2020 © IEC 2020
10 Dimensions of the pin ball
Figure 1 shows a schematic of the pin ball. Table 1 gives dimensions of the pin ball.

Figure 1 – Schematic of the pin ball
Table 1 – Dimensions of the pin ball
Dimensions in millimetres
Designated size
a
d d h r r r r
1 2 1 1 2 3 4
of coupling
0 0 0 +1,0
11 11,9 22,8 9,1 35,0 35,0 3,5 1,5

-1,1 −1,3 −1,2 0
0 0 0 +1,0
16 17,0 33,3 13,4 23,0 50,0 3,0 3,0
−1,2 −1,5 −1,3 −0,5
0 0 0 +1,0
20 21,0 41,0 19,5 27,0 60,0 5,7 3,5

−1,3 −1,6 −1,4 −1,0
0 0 0 +1,5
24 25,0 49,0 21,0 40,0 70,0 6,6 4,0

−1,4 −1,8 −1,7 −1,0
0 0 0 +1,5
28 29,0 57,0 23,5 55,0 80,0 8,0 4,5
−1,5 −1,9 −1,8 −1,0
0 0 0 +1,5
32 33,0 65,0 27,0 70,0 90,0 10,0 5,0

−1,6 −2,1 −1,9 −1,0
0 0 0 +1,5
36 37,0 73,0 34,0 50,0 110,0 10,5 8,0
−1,6 −2,1 −1,9 −1,0
0 0 0 +15，
40 41,0 81,0 39,5 55,0 120,0 12,5 9,0

−1,6 −2,1 −1,9 −10，
a
Given for guidance.

---------------------- Page: 14 ----------------------
SIST EN IEC 60120:2020
IEC 60120:2020 © IEC 2020 – 9 –
11 Dimensions of the socket end
Figure 2 shows a schematic of the socket end. Table 2 gives dimensions of the socket end.

Figure 2 – Schematic of the socket end
Table 2 – Dimensions of the socket end
Dimensions in millimetres
a b
Designated D D D H H for H for R R R R T
1 2 3 1 2 2 1 3 4 5
size of W-clips standar
coupling and d split-
alter- pins
native
split-
pins
Min. Min Min. Min.
+1,3 +1,3 +0,2
11 12,5 24,5 24,5 10,5 15,5 16,3 35,0 4,0 1,5 4,0 4,8
0 0 0

+1,6 +0,2
c
A 14,5 20,5 21,6 5,5
0 0
+1,6

16 19,2 34,5 34,5 23,0 3,0 3,0 5,0
0
+1,6 +0,2
c
B 17,0 25,0 25,5 7,9
0 0

+2,1 +2,1 +0,2
20 23,0 42,5 42,5 20,5 28,5 29,3 27,0 6,0 3,5 7,0 7,0
0 0 0

+2,5 +2,5 +0,2
24 27,5 51,0 51,0 23,5 32,5 33,5 40,0 5,0 4,0 10,0 8,7
0 0 0

+2,9 +2,9 +0,2
28 32,0 59,0 59,0 26,0 36,5 37,4 55,0 8,0 4,5 12,0 10,0
0 0 0

+3,3 +3,3 +0,2
32 36,0 67,5 67,5 30,0 42,0 43,0 70,0 10,0 5,0 14,0 11,5
0 0 0

+3,3 +3,3 +0,2
36 40,0 75,5 75,5 38,0 - 51,0 50,0 10,5 8,0 16,0 11,5
0 0 0

+3,3 +3,3 +0,2
40 44,0 83,5 83,5 43,5 - 56,5 55,0 12,5 9,0 17,0 11,5
0 0 0

a
A greater value is given because in this case the split-pin does not always rest on the bottom of the socket.
The position of the standard split-pin is determined by the position H of the centre of the hole and its
3
diameter D (see clause 14) and dimension F (see IEC 60372) and is also influenced by the tips of legs
4 2
resting in contact with the socket. The values of H ensure the correct clearances for split-pins.
2
b
Thickness of the locking device.
c
See Clause 6.

---------------------- Page: 15 ----------------------
SIST EN IEC 60120:2020
– 10 – IEC 60120:2020 © IEC 2020
12 Dimensions of the hook-on "GO" gauge
Figure 3 shows a schematic of the hook-on "GO" gauge. Table 3 gives dimensions of the
hook-on "GO" gauge.

Figure 3 – Schematic of the hook-on "GO" gauge

---------------------- Page: 16 ----------------------
IEC 60120:2020 © IEC 2020 – 11 –
SIST EN IEC 60120:2020

Table 3 – Dimensions of the hook-on "GO" gauge (1 of 2)
Dimensions in millimetres
Designated
size of Gauge D D D D H H H R R R R R R
1 2 3 4 1 2 3 1 2 3 4 5 6
coupling
a
Max. contour 12,000 22,950 25,322 60,15 9,250 17,775 23,775 35,075 35,075 3,631 1,450 49,70 2,80
New Nominal contour 11,980 22,920 25,348 59,95 9,220 17,860 23,860 35,060 35,060 3,616 1,460 49,80 2,70
11
a
Min. contour 11,960 22,890 25,374 59,75 9,190 17,945 23,945 35,045 35,045 3,601 1,470 49,90 2,60
b
Worn 11,900 22,800 25,400 59,55 9,100 18,000 24,000 35,000 35,000 3,556 1,500 50,00 2,50
a
Max. contour 17,122 33,490 35,326 90,59 13,572 20,686 31,786 23,086 50,086 3,071 2,939 71,70 2,80
New Nominal contour 17,096 33,450 35,351 90,39 13,536 20,768 31,868 23,068 50,068 3,055 2,952 71,80 2,70
16
a
Min. contour 17,070 33,410 35,376 90,19 13,500 20,850 31,950 23,050 50,050 3,039 2,965 71,90 2,60
b
Worn 17,000 33,300 35,400 89,99 13,400 20,900 32,000 23,000 50,000 2,993 3,000 72,00 2,50
a
Max. contour 21,150 41,220 45,484 120,95 19,702 25,551 42,151 27,101 60,101 5,845 3,425 89,55 3,45
New Nominal contour 21,120 41,170 45,523 120,65 19,656 25,678 42,278 27,078 60,078 5,824 3,440 89,70 3,30
20
a
Min. contour 21,090 41,120 45,561 120,35 19,610 25,805 42,405 27,055 60,055 5,803 3,455 89,85 3,15
b
Worn 21,000 41,000 45,600 120,05 19,500 25,900 42,500 27,000 60,000 5,753 3,500 90,00 3,00
a
Max. contour 25,172 49,250 50,490 140,90 21,242 25,971 46,171 40,121 70,121 6,732 3,914 104,55 3,45
New Nominal contour 25,136 49,190 50,527 140,60 21,186 26,093 46,293 40,093 70,093 6,706 3,932 104,70 3,30
24
a
Min. contour 25,100 49,130 50,564 140,30 21,130 26,215 46,415 40,065 70,065 6,680 3,950 104,85 3,15
b
Worn 25,000 49,000 50,600 140,00 21,000 26,300 46,500 40,000 70,000 6,615 4,000 105,00 3,00
a
The contour of the new gauge shall fall between the maximum and minimum contours.
b
See Clause B.1.

---------------------- Page: 17 ----------------------
– 12 – IEC 60120:2020 © IEC 2020
SIST EN IEC 60120:2020

Table 3 (2 of 2)
Designated
size of Gauge D D D D H H H R R R R R R
1 2 3 4 1 2 3 1 2 3 4 5 6
coupling
a
Max. contour 29,190 57,290 66,870 165,94 23,770 29,100 51,100 55,135 80,135 7,994 4,414 129,55 3,45
New Nominal contour 29,150 57,215 66,915 165,64 23,708 29,250 51,250 55,104 80,104 7,967 4,432 129,70 3,30
28
a
Min. contour 29,110 57,140 66,960 165,34 23,646 29,400 51,400 55,073 80,073 7,938 4,450 129,85 3,15
b
29,000 57,000 67,000 165,04 23,500 29,500 51,500 55,000 80,000 7,864 4,500 130,00 3,00
Worn
a
Max. contour 33,220 65,310 85,800 198,45 27,300 34,000 61,400 70,150 90,150 9,719 4,914 149,55 3,45
New Nominal contour 33,170 65,230 85,850 198,22 27,225 34,175 61,600 70,112 90,113 9,683 4,932 149,70 3,30
32
a
Min. contour 33,120 65,150 85,900 197,98 27,150 34,350 61,800 70,075 90,075 9,647 4,950 149,85 3,15
b
33,000 65,000 86,000 197,83 27,000 34,500 62,000 70,000 90,000 9,572 5,000 150,00 3,00
Worn
a
Max. contour 37,220 73,310 10
...