EN 15566:2022

SLOVENSKI STANDARD
01-november-2022
Nadomešča:
SIST EN 15566:2016
Železniške naprave - Železniška vozila - Vlečna naprava in vijačna spenjača
Railway applications - Railway Rolling stock - Draw gear and screw coupling
Bahnanwendungen - Schienenfahrzeuge - Zugeinrichtung und Schraubenkupplung
Applications ferroviaires - Matériel roulant ferroviaire - Organe de traction et tendeur
d'attelage
Ta slovenski standard je istoveten z: EN 15566:2022
ICS:
45.060.10 Vlečna vozila Tractive stock
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15566
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2022
EUROPÄISCHE NORM
ICS 45.060.01 Supersedes EN 15566:2016
English Version
Railway applications - Railway Rolling stock - Draw gear
and screw coupling
Applications ferroviaires - Matériel roulant ferroviaire Bahnanwendungen - Schienenfahrzeuge -
- Organes de traction et tendeur d'attelage Zugeinrichtung und Schraubenkupplung
This European Standard was approved by CEN on 10 July 2022.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15566:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 6
Introduction . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Requirements for all types of draw gear and screw coupling. 13
4.1 Classification and designation . 13
4.2 Interface dimension for freight wagons. 14
4.3 Lifetime . 15
5 Draw gear . 15
5.1 Draw gear components . 15
5.2 Draw hook and drawbar – Requirements . 16
6 Screw coupling . 17
6.1 General requirements . 17
6.2 Screw coupling – Requirements. 19
7 Elastic device . 20
7.1 Characteristics of the elastic device . 20
7.2 Elastic device – Requirements . 20
Annex A (normative) Dynamic test (fatigue test) procedure . 21
A.1 Background . 21
A.2 Performance of the test . 21
A.2.1 Conditioning . 21
A.2.2 Dynamic test (fatigue test) . 21
A.2.3 Non-destructive tests . 23
A.2.4 Determination of residual strength . 23
A.2.5 Macrographic and Micrographic tests . 24
A.3 Criteria of acceptance . 24
A.4 Test report . 24
Annex B (normative) Draw hook — dimensions . 25
Annex C (normative) Draw gear — Interface dimension . 26
Annex D (normative) Screw coupling components - dimensions . 28
Annex E (normative) Draw hook and drawbar - Requirements . 30
E.1 Physical characteristics . 30
E.1.1 Appearance . 30
E.1.2 Integrity . 30
E.1.3 Material examination . 30
E.2 Geometrical characteristics . 31
E.3 Mechanical characteristics . 31
E.3.1 General . 31
E.3.2 Tensile test on test piece . 31
E.3.3 Resilience. 31
E.3.4 Hardness . 31
E.3.5 Tensile test on draw hook and drawbar . 32
E.4 Marking . 32
E.5 Manufacture. 32
E.5.1 General on drawbars . 32
E.5.2 General on draw hooks . 32
E.5.3 Machining . 32
E.5.4 Heat treatment . 33
E.5.5 Rectification of defects. 33
E.6 Acceptance . 33
E.6.1 General . 33
E.6.2 Inspection of the draw hooks . 35
E.6.3 Inspection of drawbars . 38
E.6.4 Conclusion of the inspections . 39
E.7 Delivery . 39
E.7.1 Protection against corrosion . 39
E.7.2 Packaging . 39
Annex F (normative) Screw coupling and components parts — Requirements . 40
F.1 Materials . 40
F.2 Physical characteristics . 40
F.2.1 Appearance . 40
F.2.2 Soundness . 40
F.2.3 Additional requirements for screw coupling . 41
F.3 Geometrical characteristics . 41
F.3.1 General . 41
F.3.2 Dimensions limited either by two unmachined or rough machined surfaces or by
one unmachined or rough machined surface . 42
F.3.3 Dimensions limited by two machined surfaces . 42
F.4 Mechanical characteristics . 42
F.4.1 Heat treatment . 42
F.4.2 Hardness . 42
F.4.3 Resilience. 43
F.4.4 Requirements for screw coupling . 43
F.4.5 Requirement for handle and trunnion . 45
F.5 Marking . 45
F.6 Manufacture . 45
F.6.1 Preparation of the materials . 45
F.6.2 Manufacture of the component parts . 45
F.7 Acceptance . 48
F.7.1 General . 48
F.7.2 Inspection of the manufacture . 48
F.8 Inspection of the materials, component parts and screw couplings . 48
F.8.1 Materials submission for acceptance . 48
F.8.2 Grouping into batches . 49
F.8.3 Nature and proportion of the tests . 49
F.8.4 Sampling and preparation of the samples and test pieces . 50
F.8.5 Carrying out of the checks and tests . 54
F.9 Completion of inspections. 56
F.10 Delivery. 56
F.10.1 Protection against oxidation . 56
F.10.2 Packing . 56
Annex G (normative) Elastic device — Requirements . 57
G.1 Rubber elastomer or other elastomer elastic device . 57
G.1.1 General . 57
G.1.2 Metal inserts requirements . 57
G.1.3 Elastomer requirements . 57
G.1.4 Static test . 59
G.1.5 Endurance test . 60
G.1.6 Bonding . 62
G.1.7 Inspection and tests . 62
G.1.8 Markings . 64
G.2 Friction spring/ Ring spring . 64
G.2.1 Manufacturer's marks . 64
G.2.2 Flexibility test . 64
G.2.3 Endurance test . 65
Annex H (normative) Marking . 66
H.1 Marking of the draw hook . 66
H.2 Marking of the screw coupling . 66
H.3 Draw gear . 67
H.4 Drawbar . 67
H.5 Summary of markings . 68
Annex I (informative) Microscopic examination of steel materials using standard diagrams
to assess the content of non-metallic inclusions . 69
I.1 General . 69
I.1.1 Degree of purity . 69
I.1.2 Standard diagram plate No. 1 . 69
I.2 Preparation of specimens . 69
I.3 Structure and use of standard diagram plate No. 1 . 69
I.3.1 Use of diagram plate No. 1 . 69
I.3.2 Rating a single inclusion . 70
I.3.3 Rating of very small inclusions . 70
I.4 Test procedure . 70
I.4.1 Magnification . 70
I.4.2 Selection of inclusions . 70
I.5 Evaluation . 71
I.5.1 General . 71
I.5.2 Method of evaluation . 71
I.5.3 Calculation procedure for evaluation using method K . 71
I.6 Example . 74
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive (EU) 2016/797 aimed to be covered . 75
Bibliography . 77

European foreword
This document (EN 15566:2022) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2023, and conflicting national standards
shall be withdrawn at the latest by February 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15566:2016.
Compared with EN 15566:2016 the following changes have been done:
a) Adaption in Terms and Definition at 3.3 “draw hook”;
b) Modification on Note in 6.1 to the production;
c) Revision of Annex E, particular Table E.1 and E.3.1;
d) Revision of Annex F, particular on Table F.1 and F.6.2.3, F.8.4.2 a);
e) New Annex I “Microscopic examination of steel materials using standard diagrams to assess the
content of non-metallic inclusions”;
f) Adaption of Annex ZA in relastion to the new approach;
g) Adaption of this document in relation to the intersection contents on EN 16839;
h) Deleting of 4.2 “Interaction coupling/buffer”;
i) Modification of the following figures:
Figure E.1 — Draw hook - Location of the test samples;
Figure E.3 — Drawbar - Location of the test samples;
Figure F.2 — Test facility for the tensile test of the screw coupling;
Figure F.5 — Screw – test sample location;
Figure F.6 — Shackle – test sample location;
Figure G.1 — Elastic device – load cycle for endurance test;
Figure G.2 — Elastic device – Set up for endurance test;
j) editorial modifications.
This document has been prepared under a standardization request addressed to CEN by the European
Commission, and it aims to support essential or other requirements of EU Directive(s) or Regulation(s).
For relationship with EU Directive(s) or Regulation(s), see informative Annex ZA, which is an integral
part of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Introduction
This document is based on UIC 520:2003, UIC 825:1985, UIC 826:2004, UIC 827-1:1990 and UIC 827-
2:1981.
1 Scope
This document specifies the requirements for the draw gear and screw coupling for the end of rolling
stock that is required to couple with other rolling stock (freight wagons, locomotives, passenger
vehicles, etc.).
This document covers the functionality, construction, interfaces and testing including pass/fail criteria
for draw gear and screw coupling.
The document describes three categories of draw gear and screw coupling, (1 MN, 1,2 MN and 1,5 MN).
Provisions going beyond the scope of this document may be agreed in the Technical Specification. The
Technical Specification is not a mandatory document.
Coupling systems between permanently coupled vehicle units are not in the scope of this document.
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.
EN 1369:2012, Founding - Magnetic particle testing
EN 1371-1:2011, Founding - Liquid penetrant testing- Part 1: Sand, gravity die and low pressure die
castings
EN 10021:2006, General technical delivery conditions for steel products
EN 10025-2:2019, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-
alloy structural steels
EN 10079:2007, Definition of steel products
EN 10168:2004, Steel products - Inspection documents - List of information and description
EN 10204:2004, Metallic products - Types of inspection documents
EN 10228-1:2016, Non-destructive testing of steel forgings - Part 1: Magnetic particle inspection
EN 10228-2:2016, Non-destructive testing of steel forgings - Part 2: Penetrant testing
EN 10243-1:1999, Steel die forgings - Tolerances on dimensions - Part 1: Drop and vertical press forgings
EN 10243-2:1999, Steel die forgings - Tolerances on dimensions - Part 2: Upset forging made on
horizontal forging machines
EN 10308:2001, Non destructive testing - Ultrasonic testing of steel bars
EN ISO 148-1:2016, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-
1:2016)
EN ISO 148-2:2016, Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing
machines (ISO 148-2:2016)
EN ISO 148-3:2016, Metallic materials - Charpy pendulum impact test - Part 3: Preparation and
characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines (ISO
148-3:2016)
EN ISO 377:2017, Steel and steel products - Location and preparation of samples and test pieces for
mechanical testing (ISO 377:2017)
EN ISO 643:2020, Steels - Micrographic determination of the apparent grain size (ISO 643:2019, Corrected
version 2020-03)
EN ISO 683-1:2018, Heat-treatable steels, alloy steels and free-cutting steels - Part 1: Non-alloy steels for
quenching and tempering (ISO 683-1:2016)
EN ISO 683-2:2018, Heat-treatable steels, alloy steels and free-cutting steels - Part 2: Alloy steels for
quenching and tempering (ISO 683-2:2016)
EN ISO 683-3:2022, Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening
steels (ISO 683-3:2022)
EN ISO 683-4:2018, Heat-treatable steels, alloy steels and free-cutting steels - Part 4: Free-cutting steels
(ISO 683-4:2016)
EN ISO 683-17:2014, Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller
bearing steels (ISO 683-17:2014)
EN ISO 868:2003, Plastics and ebonite — Determination of indentation hardness by means of a durometer
(Shore hardness) (ISO 868:2003)
EN ISO 6506-1:2014, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014)
EN ISO 6892-1:2019, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2019)
EN ISO 6892-2:2018, Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 9606-1:2017, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012 and Cor 2:2013)
ISO 37:2017, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness
between 10 IRHD and 100 IRHD
ISO 48-3:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 3: Dead-load
hardness using the very low rubber hardness (VLRH) scale
ISO 48-4:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation
hardness by durometer method (Shore hardness)
ISO 48-8:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 8: Apparent
hardness of rubber-covered rollers by Pusey and Jones method
ISO 48-9:2018, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 9: Calibration
and verification of hardness testers
ISO 188:2011, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 813:2019, Rubber, vulcanized or thermoplastic — Determination of adhesion to a rigid substrate —
90 degree peel method
ISO 815-1:2019, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At
ambient or elevated temperatures
ISO 815-2:2019, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 2: At
low temperatures
ISO 4967:2013, Steel — Determination of content of non-metallic inclusions — Micrographic method
using standard diagrams
ISO 4968:1979, Steel — Macrographic examination by sulfur print (Baumann method)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
screw coupling system
system to connect two railway vehicles consisting of draw gear, draw hook and screw coupling
Note 1 to entry: The screw coupling system defined in this document is also designated UIC coupling.
3.2
draw gear
system, able to work in traction, consisting of an assembly of mechanical parts and energy absorber,
fixed on the railway vehicle, which is able to work in traction
Note 1 to entry: A representative drawing is given in Figure 3.
3.3
draw hook
part of a conventional and mechanical manual coupling system to transfer forces between draw gear
and screw coupling
Note 1 to entry: In case of rescue, the draw hook is used to transfer forces between rescue coupler and draw
gear.
3.4
screw coupling
mechanical system to connect to the draw hook of the adjacent railway vehicle including length
adjustment
3.5
Standard screw coupling
1 MN screw coupling defined on ERRI standard drawings 100M 3220 0001 and 100M 3220 0002 [17]
3.6
stored energy
W
e
energy (W ) stored by draw gear for a given stroke
e
Note 1 to entry: It is represented, on the force-stroke diagram, by the hatched area lying between the
compressive curve, the axis of the abscissa and the straight line, perpendicular to the axis, corresponding to the
stroke under consideration (see Figure 1 a)).
3.7
absorbed energy
W
a
energy (W ) absorbed by a draw gear for a given stroke
a
Note 1 to entry: It is represented, on the force-stroke diagram, by the hatched area lying between the
compressive curve and the return curve (see Figure 1 b)).

a) Stored energy W b) Absorbed energy W
e a
Key
1 force, in kN
2 stroke, in mm
stored energy We, in kJ
absorbed energy W , in kJ
a
Figure 1 — Force stroke diagram for stored and absorbed energy
3.8
damping
d
absorbed energy divided by stored energy
Note 1 to entry: It is calculated using the following formula:
W
a
d × 100%
%
W
e
where:
d% is the damping, in %
W is the absorbed energy, in kJ
a
W is the stored energy, in kJ.
e
3.9
minimum breaking load
minimum traction force which may lead to mechanical breaking
3.10
Technical Specification
document describing specific parameters and/or product requirements as an addition to the
requirements of this standard
4 Requirements for all types of draw gear and screw coupling
4.1 Classification and designation
Coupling systems are classified according to their minimum breaking load as specified in Table 1.
Table 1 — Classification and designation of coupling systems
Coupling system Minimum breaking load Maximum breaking Minimum breaking load
designation of the screw coupling load of the screw in traction of the draw
coupling gear and draw hook
MN MN MN
1 MN 0,85 0,99 1,0
1,2 MN 1,02 1,19 1,2
1,5 MN 1,35 1,49 1,5
In case of longitudinal overloading the breaking point of the screw coupling system shall be either the
screw or the link of the screw coupling.
NOTE The combination of a screw coupling with draw hooks and/or draw gear with higher breaking loads is
possible. The screw coupling system designation is defined by the screw coupling.
Any draw gear and any draw hook shall sustain a 0,05 MN compressive load. Draw gear and draw hooks
for locomotives shall sustain a 0,3 MN compressive load.
=
4.2 Interface dimension for freight wagons
Support plate interface dimensions for fixing of draw gear on freight wagons are defined in Figure 2.
Draw gear assemblies shall be interchangeable. The interchangeability only applies to complete draw
gear assemblies, not to single draw gear parts.
NOTE For other railway vehicles and for wagons operating on 1 524 mm track gauge, the arrangement could
be different and interchangeability is not required.
Dimensions in millimetres
Key
1 buffer fixing plate
2 support plate
3 underframe
NOTE The centreline of the draw gear (screw coupling) is also the centreline of the automatic coupler.
Figure 2 — Support plate — Interface dimension for freight wagons
4.3 Lifetime
Draw gear (excluding the elastic device), draw hooks, and screw couplings shall be designed
commensurate with the service life of a vehicle. Unless otherwise specified, the service life shall be
30 years.
Evidence shall be provided by appropriate means such as service experience, a dynamic test or
bydynamic calculation (e.g. Finite Element Method (FEM)). If a dynamic test is required, it shall be
carried out according to the test procedure described in Annex A.
NOTE 1 The FEA and the dynamic test do not give indication of the real lifetime of a component in operation.
NOTE 2 Lifetime test qualifies the product and the manufacturer.
5 Draw gear
5.1 Draw gear components
See Figure 3 for an example of draw gear assembly.The interface dimensions of the draw gear are given
in Annex B and Annex C.
Components of standard draw gear for freight wagons assembled with a draw hook are:
— Draw hook see Figure B.1;
— Drawbar interface dimensions, see Figure C.1;
— Joint pin interface dimensions, see Figure C.2;
— Elastic device see Clause 7;
— Support plate see 4.3.
Key
1 draw hook (not a part of the draw gear)
2 drawbar
3 joint pin
4 support plate
5 elastic device
6 underframe
Direction of view
Figure 3 — Draw gear — Assembly
5.2 Draw hook and drawbar – Requirements
Requirements are defined in Annex E.
6 Screw coupling
6.1 General requirements
The mass of the screw coupling shall not exceed 36 kg without the coupling hook pin (see item 1 on
Figure 4 and Figure 5).
The screw coupler assembly for a “standard screw coupling” with non-loosening hinged ball handle
shall be as shown in Figure 4.
The screw coupler assembly for a “standard screw coupling” with hinged handle with non-loosening
upper rest shall be as shown in Figure 5.
“Standard screw coupling” is the name of the 1 MN screw coupling defined on ERRI standard drawings
100M 3220 0001 and 100M 3220 0002 [17]. The upper safety catch of the handle together with the
trunnion nut for the handle with top-mounted rest as a monobloc may be made by a hot forming
process.
The coupling length measured from inside the loop of a shackle to the coupling hook pin axis of the
coupling screw and draw hook shall comply with the following conditions:
+10
— 986 mm for the fully loosened coupling and called D ;
( )
−5
— (750 ± 10) mm for the fully tightened coupling and called D .
Key
1 coupling hook pin
2 coupling links
3 screw
4 trunnion nut for ball handle with top-mounted rest
5 handle housing
6 hinged ball handle head
7 trunnion nut
8 shackle
+10
greatest length for the fully loosened coupling 986 mm
D
( )
−5
D2 smallest length for the fully tightened coupling (750 ± 10) mm
Figure 4 — Standard screw coupling with non-loosening hinged ball handle
Key
1 coupling hook pin
2 coupling links
3 screw
4 trunnion nut for ball handle
5 handle housing
6 hinged handle head
7 trunnion nut
8 shackle
D1
+10
greatest length for the fully loosened coupling 986 mm
( )
−5
D smallest length for the fully tightened coupling (750 ± 10) mm
Figure 5 — Standard screw coupling with hinged handle with non-loosening upper rest
Functional dimensions of screw coupling components shall be as given in Annex D.
6.2 Screw coupling – Requirements
Requirements are defined in Annex F.
7 Elastic device
7.1 Characteristics of the elastic device
a) Force at stroke between 50 mm and 60 mm:
mandatory minimum value 400 kN;
recommended minimum value 550 kN;
b) Pre-compression:
mandatory minimum value 10 kN;
recommended minimum value 20 kN;
c) Static stored energy W :
e
mandatory minimum value 10 kJ;
recommended minimum value in respect of wagons be equipped with 1,5 MN 20 kJ;
d) Damping d:
mandatory minimum value (d ) 30 %.
%
The tests shall be carried out within a temperature range of 15 °C to 25 °C. The decompression period
shall immediately follow the compression period, and the maximum speed of movement of the drawbar
in either direction shall not exceed 0,05 m/s. After a total release of the elastic device, the conditions
shall return to those prevailing initially. The test is described in G.1.4.
7.2 Elastic device – Requirements
Requirements are defined in Annex G.
Annex A
(normative)
Dynamic test (fatigue test) procedure
A.1 Background
The test procedure is based on (ERRI B 51 RP 27) [16]. It has been enhanced to provide additional and
more detailed instructions and/or recommendations.
This test procedure is also applicable for screw coupling systems for passenger coaches, locomotives
and special vehicles other than (ERRI B 51 RP 27) [16].
A.2 Performance of the test
A.2.1 Conditioning
— The specimens shall be loaded at least once to the pre-load value given in Table A.1 (corresponding
to approximately 75 % of the minimum breaking load, see Table 1).
— Then, the test objects withstanding the longitudinal force shall be checked on the whole surface by
MT (Magnetic Particle Testing) or PT (Penetrant Testing) according to EN 10228-1:2016 and
EN 10228-2:2016. Any indications occurring shall be recorded for size and shape.
NOTE Stress measurements can be performed but need not be evaluated in the test report. It is also possible
to do several conditioning cycles.
Table A.1 — Pre-loading values
Coupling systems designation Screw coupling Draw gear and draw hook
kN kN
1 MN 640 750
1,2 MN 765 900
1,5 MN 1 010 1 125
A.2.2 Dynamic test (fatigue test)
In the dynamic test, the “Step 1” load cycles shall be interspersed with “Step 2” load cycles at regular
intervals. The “Step 2” load cycles can also be combined in blocks (divide their total number into at least
40 blocks). The values of these loads are given in Table A.2 and Table A.3.
— The given load range for Step 1 shall be applied in combination with a lower load which shall not be
less than 10 kN and should not be higher than 50 kN. Hence the upper load limit shall be at least the
lower load + ΔF 1.
— Step 2 is a maximum load. If the test equipment or set-up does not allow load application below a
certain minimum load, this value need not be added to the Step 2 maximum load. Holding the
maximum force for a period should be avoided.
— A sample of the load-time curve shall be included in the test report.
— The loading frequency should not exceed 4 Hz.
Figure A.1 shows an example for the resulting load course.
...