EN 17976:2024

Railway applications - Bolting of rail vehicles and components

This document 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 document 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: Published
• Publication Date: 10-Dec-2024
• ICS: 21.060.10 - Bolts, screws, studs
• ICS: 21.060.20 - Nuts
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/WG 2 - Structural requirements
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Dec-2024
• Due Date: 18-Dec-2023
• Completion Date: 11-Dec-2024
• Ref Project: SIST EN 17976:2025 - Railway applications - Bolting of rail vehicles and components

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2024
Železniške naprave - Vijačenje železniških vozil in komponent
Railway applications - Bolting of rail vehicles and components
Bahnanwendungen - Verschrauben von Schienenfahrzeugen und -fahrzeugteilen
Applications ferroviaires - Boulonnage des véhicules et des composants ferroviaires
Ta slovenski standard je istoveten z: EN 17976:2024
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.

EN 17976
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 21.060.10; 21.060.20
English Version
Railway applications - Bolting of rail vehicles and
components
Applications ferroviaires - Boulonnage des véhicules et Bahnanwendungen - Verschrauben von
des composants ferroviaires Schienenfahrzeugen und -fahrzeugteilen
This European Standard was approved by CEN on 30 September 2024.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17976:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 12
5 Personnel competency . 16
6 Safety category . 16
6.1 Safety category of mechanical and electrical connections . 16
6.2 Requirements depending on safety category . 17
6.2.1 Mechanical connections . 17
6.2.2 Electrical connections . 18
7 Design . 18
7.1 Design rules . 18
7.1.1 General . 18
7.1.2 Thread . 18
7.1.3 Bolts and nuts . 19
7.1.4 Mechanical properties of fasteners . 19
7.1.5 Design of component . 20
7.1.6 Resilience of a bolted joint . 24
7.1.7 Length of engagement . 25
7.1.8 Chamfers. 27
7.1.9 Thread protrusions . 27
7.1.10 Clearance hole for bolt . 27
7.1.11 Counterbore/countersink. 28
7.1.12 Core hole diameter and thread runout . 29
7.1.13 Accessibility for tools and tightening . 30
7.2 Mechanical connection — Strength proof . 31
7.2.1 General . 31
7.2.2 Criterion ‘no permanent plastic deformation’ in assembled state . 31
7.2.3 Functional requirements. 33
7.2.4 Criterion ‘no permanent plastic deformation’ under loads . 35
7.2.5 Surface Pressure . 35
7.2.6 Creep . 36
7.2.7 Engagement length . 36
7.2.8 Fatigue assessment . 36
7.2.9 Failure . 37
7.2.10 Partial factors for strength assessment . 37
7.3 Electrical connection . 38
7.3.1 General . 38
7.3.2 Selection of the fasteners . 38
7.3.3 Assembly of the bolted joints . 39
7.4 Corrosion protection. 41
7.4.1 Effect of protection of coatings and materials in fasteners . 41
7.4.2 Galvanic corrosion . 44
7.5 Securing methods . 47
7.5.1 Bolted joints for applications in terms of mechanical engineering . 47
7.5.2 Bolted joints for electrical connections . 47
7.5.3 Securing measures . 47
7.6 Documentation of the design . 52
8 Assembly of bolted joints . 52
8.1 General . 52
8.2 Tools . 53
8.2.1 Tool requirements . 53
8.2.2 Monitoring of the tightening tools and systems . 55
8.3 Tightening method . 56
8.3.1 General . 56
8.3.2 Marking of bolted joints . 56
8.3.3 Work instructions and requirements for the assembly process . 56
8.4 Environmental conditions . 58
8.5 Validation of the assembly result during first assembly review . 58
8.6 Quality assurance of the assembly result in serial production. 58
8.7 Record of assembly . 59
8.8 Reuse of fasteners . 60
8.9 Lifetime inspection . 60
9 Performance classes . 60
10 Properties of parameters . 61
10.1 General . 61
10.2 Statistical evaluation . 61
10.3 Physical properties . 65
10.3.1 Static friction coefficient in the interface . 65
10.3.2 Friction coefficients for tightening . 65
10.3.3 Limit values for surface pressure . 66
10.3.4 Embedding . 66
Annex A (informative) Size estimation . 67
A.1 General . 67
A.2 Limits for the size estimation .
...