oSIST prEN 17976:2023

Railway applications - Bolting of railway vehicles and components

This European standard specifies the requirements for designing, strength assessment, assembly and servicing of mechanical and electrical bolted joints made from metallic components and bolts
This document is not intended for rivets, lock bolts, self-tapping screws, wood screws, thread-rolling screws, thread-forming and chipboards.
This European Standard is applicable to all rail vehicles.

Bahnanwendungen - Verschrauben von Schienenfahrzeugen und -fahrzeugteilen

Dieses Dokument legt die Anforderungen für den Entwurf, die Festigkeitsbewertung, die Montage und die Instandhaltung von mechanischen und elektrischen Schraubverbindungen aus metallischen Bauteilen und Schrauben fest.
Dieses Dokument ist nicht für Nieten, Schlossschrauben, selbstschneidende Schrauben, Holzschrauben, gewindefurchende Schrauben, gewindeformende Schrauben und Spanplatten anzuwenden.
Dieses Dokument ist auf alle Schienenfahrzeuge anwendbar.

Applications ferroviaires - Boulonnage des véhicules et des composants ferroviaires

Le présent document spécifie les exigences relatives à la conception, à l'évaluation de la résistance, au montage et à l'entretien des assemblages boulonnés mécaniques et électriques composés de pièces mécaniques et de boulons.
Le présent document ne concerne pas les rivets, les boulons de verrouillage, les vis taraudeuses, les vis à bois, les vis autotaraudeuses, les vis autotaraudeuses par déformation et les panneaux de particules.
Le présent document s'applique à tous les véhicules ferroviaires.

Železniške naprave - Vijačenje železniških vozil in komponent

General Information

• Status: Not Published
• Public Enquiry End Date: 31-Jul-2023
• ICS: 21.060.01 - Fasteners in general
• ICS: 21.060.10 - Bolts, screws, studs
• ICS: 21.060.20 - Nuts
• ICS: 45.040 - Materials and components for railway engineering
• Technical Committee: IŽNP - Reilway applications
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 25-May-2023
• Due Date: 12-Oct-2023
• Completion Date: 02-Aug-2023
• Ref Project: FprEN 17976 - Railway applications - Bolting of rail vehicles and components

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2023
Železniške naprave - Vijačenje železniških vozil in komponent
Railway applications - Bolting of railway vehicles and components
Bahnanwendungen - Verschrauben von Schienenfahrzeugen und -fahrzeugteilen
Ta slovenski standard je istoveten z: prEN 17976
ICS:
21.060.01 Vezni elementi na splošno Fasteners in general
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 17976
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2023
ICS
English Version
Railway applications - Bolting of railway vehicles and
components
Bahnanwendungen - Verschrauben von
Schienenfahrzeugen und -fahrzeugteilen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17976:2023 E
worldwide for CEN national Members.

prEN 17976:2023 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Symbols and abbreviations . 15
5 Personnel competency . 18
6 Definition of safety level . 19
6.1 General . 19
6.2 Safety level of mechanical connection . 20
6.2.1 Severity level . 20
6.2.2 Safety class . 20
6.2.3 Safety level . 21
6.3 Safety level of electrical connection . 21
6.3.1 Safety level High (H) . 21
6.3.2 Safety level Medium (M) . 22
6.3.3 Safety level Low (L) . 22
6.4 Requirements depending on safety level . 23
6.4.1 Mechanical connections . 23
6.4.2 Electrical connections. 24
7 Design . 25
7.1 Design rules . 25
7.1.1 General . 25
7.1.2 Thread . 25
7.1.3 Bolts and nuts . 25
7.1.4 Mechanical properties of fasteners . 25
7.1.5 Design of component . 26
7.1.6 Resilience of a bolted joint . 28
7.1.7 Length of engagement . 28
7.1.8 Chamfers . 31
7.1.9 Thread protrusions . 31
7.1.10 Clearance hole for bolt . 32
7.1.11 Counterbore / Countersink . 32
7.1.12 Core hole diameter and thread runout . 33
7.1.13 Edge distances and spacing . 34
7.1.14 Accessibility for tools and tightening. 35
7.2 Mechanical connection — Strength proof . 35
7.2.1 General . 35
prEN 17976:2023 (E)
7.2.2 bolt yielding in assembled state . 36
7.2.3 Functional requirements . 38
7.2.4 Bolt yielding under operational loads . 41
7.2.5 Surface Pressure . 42
7.2.6 Creep . 42
7.2.7 Engagement length . 42
7.2.8 fatigue assessment . 43
7.2.9 Failure . 43
7.2.10 Safety factors for strength assessment . 43
7.3 Electrical connection. 44
7.3.1 General . 44
7.3.2 Selection of the fasteners . 45
7.3.3 Assembly of the bolted connections . 46
7.4 Corrosion . 48
7.4.1 General . 48
7.4.2 Effect of protection of coatings and materials in connection elements. 48
7.4.3 Galvanic corrosion . 51
7.5 Securing methods . 54
7.5.1 Bolted joints for applications in terms of mechanical engineering . 54
7.5.2 Bolted joints for electrical connections . 54
7.5.3 Securing measures . 54
7.6 Documentation of the design . 58
8 Assembly of bolted joints . 58
8.1 General . 58
8.2 Tools . 59
8.2.1 Tool requirements . 59
8.2.2 Monitoring of the tightening tools and systems . 61
8.3 Tightening method . 61
8.3.1 General . 61
8.3.2 Marking of bolted joints . 62
8.3.3 Work instructions . 62
8.4 Environmental conditions . 64
8.5 Validation of the assembly result during first assembly review . 64
8.6 Quality assurance of the assembly result in serial production . 64
8.7 Record of assembly . 65
8.8 Reuse of fasteners . 65
8.9 Lifetime inspection . 66
9 Performance classes . 66
10 Properties of parameters . 67
10.1 General . 67
10.2 Statistical evaluation. 67
10.3 Physical properties . 70
10.3.1 Static friction coefficient in the interface . 70
10.3.2 Friction coefficients for tightening . 70
10.3.3 Limit values for surface pressure . 71
10.3.4 Embedding .
...