EN 14399-10:2018

SLOVENSKI STANDARD
01-julij-2018
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SIST EN 14399-10:2009
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High-strength structural bolting assemblies for preloading - Part 10: System HRC - Bolt
and nut assemblies with calibrated preload
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 10:
System HRC - Garnituren aus Schrauben und Muttern mit kalibrierter Vorspannung
Boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie
10 : Système HRC - Boulons (vis + écrou + rondelle) à précontrainte calibrée
Ta slovenski standard je istoveten z: EN 14399-10:2018
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 14399-10
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2018
EUROPÄISCHE NORM
ICS 21.060.01 Supersedes EN 14399-10:2009
English Version
High-strength structural bolting assemblies for preloading
- Part 10: System HRC - Bolt and nut assemblies with
calibrated preload
Boulonnerie de construction métallique à haute Hochfeste vorspannbare Garnituren für
résistance apte à la précontrainte - Partie 10 : Système Schraubverbindungen im Metallbau - Teil 10: System
HRC - Boulons (vis + écrou + rondelle) à précontrainte HRC - Garnituren aus Schrauben und Muttern mit
calibrée kalibrierter Vorspannung
This European Standard was approved by CEN on 22 October 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14399-10:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Bolts . 9
4.1 Dimensions of bolts . 9
4.2 Specification for bolts and reference standards . 16
4.3 Marking of bolts . 17
5 Nuts . 17
5.1 Dimensions of nuts . 17
5.2 Specification for nuts and reference standards . 19
5.3 Proof load values of nuts . 20
5.4 Decarburization of the nut thread . 20
5.5 Marking of nuts . 20
6 Designation of bolt/nut assemblies. 21
7 Associated washers . 21
8 Functional characteristics of bolt/nut/washer(s) assemblies . 21
8.1 General . 21
8.2 Suitability test for preloading . 22
8.2.1 General . 22
8.2.2 Test results . 23
8.3 Suitability test for calibrated preload . 24
8.4 Requirements . 24
Annex A (informative) Clamp lengths and grip lengths . 26
Bibliography . 28

European foreword
This document (EN 14399-10:2018) has been prepared by Technical Committee CEN/TC 185
“Fasteners”, the secretariat of which is held by BSI.
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 November 2018 and conflicting national standards
shall be withdrawn at the latest by November 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 14399-10:2009.
In comparison with EN 14399-10:2009, the following modifications have been made:
— Table 1 containing the overview of the marking of components of bolting assemblies for preloading
was added;
— specifications for the designation of the bolting assemblies have been revised;
— dimensions and markings of HRC bolts with countersunk heads have been added;
— dimensions and limiting values of M36 diameter bolts and nuts have been added;
— the requirement for the coefficient of variation has been revised.
EN 14399 consists of the following parts, under the general title High-strength structural bolting
assemblies for preloading:
— Part 1: General requirements
— Part 2: Suitability for preloading
— Part 3: System HR — Hexagon bolt and nut assemblies
— Part 4: System HV — Hexagon bolt and nut assemblies
— Part 5: Plain washers
— Part 6: Plain chamfered washers
— Part 7: System HR — Countersunk head bolt and nut assemblies
— Part 8: System HV — Hexagon fit bolt and nut assemblies
— Part 9: System HR or HV — Direct tension indicators for bolt and nut assemblies
— Part 10: System HRC — Bolt and nut assemblies with calibrated preload
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
This document on structural bolting reflects the situation in Europe where two technical solutions exist
to achieve the necessary ductility of bolt/nut/washer(s) assemblies. These solutions consist of two
different types (HR and HV) of bolt/nut/washer assemblies, see Table 1. Both types are well proven and
it is the responsibility of the experts using structural bolting whether they use the one or the other type.
It is, however, important for the performance of the assembly to avoid mixing up the components of
both types. Therefore, bolts and nuts for both types are standardized in one single part of this European
Standard each and the marking of the components of the bolting assemblies is uniform.
Preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication. Therefore
it is important that the bolting assemblies are supplied by one manufacturer, who is always responsible
for the functionality of the bolting assemblies as supplied.
For the same reason it is important that coating of the bolting assemblies is under the control of one
manufacturer.
Beside the mechanical properties of the components, the functionality of the bolting assemblies
requires that the specified preload can be achieved if the bolting assemblies are tightened with a
suitable procedure. For this purpose a test method for the suitability of the bolting assemblies for
preloading was created, which will demonstrate whether the functionality of the bolting assemblies is
fulfilled.
It should be pointed out that compared to ISO 272 the width across flats (large series) for M12 and M20
have been changed to 22 mm and 32 mm respectively. These changes are justified by the following
reasons.
Under the specific conditions of structural bolting, the compressive stresses under the bolt head or nut
for the sizes M12 may become too large with the width across flats of 21 mm, especially if the washer is
fitted eccentrically to the bolt axis.
For the size M20, the width across flats of 34 mm is very difficult to be produced. The change to 32 mm
is primarily motivated by economics but it should also be pointed out that the width across flats of
32 mm was common practice in Europe.
Table 1 — Composition of high-strength structural bolting assemblies and component marking
Type of bolting assembly System HR System HV System HRC
General requirements EN 14399–1
Suitability for preloading EN 14399–2 and, if any, additional testing specified in the product standard
Bolt and nut EN 14399–3 EN 14399–7 EN 14399–4 EN 14399–8 EN 14399–10
Bolt HR8.8 HR10.9 HR8.8 HR10.9 HV10.9 HVP10.9 HRC10.9
HR8 or HR8 or
Nut HR10 HR10 HV10 HV10 HR10 HRD10
HR10 HR10
a
EN 14399–5 or
a
Washer(s) EN 14399–5 or EN 14399–6 EN 14399–6
EN 14399–6
b b b b c
Marking H or HR H or HV H or HR H or HR or HD
Direct tension indicator and
nut face washer or bolt face EN 14399–9
washer, if any
Direct tension indicator H8 H10 H8 H10 H10 Not applicable
Nut face washer HN HN
Bolt face washer HB Not applicable HB
a
EN 14399–5 can only be used under the nut.
b
At the choice of the manufacturer.
c
Mandatory mark for washers with enlarged outer diameter according to EN 14399-5 only.

Marking Marking
1 Scope
This document specifies, together with EN 14399-1 and EN 14399-2, the requirements for assemblies of
high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head
(large width across flats), cup head or countersunk head, thread sizes M12 to M36 and property class
10.9/10.
Bolting assemblies in accordance with this document have been designed to allow preloading of at least
1)
0,7 f × A according to EN 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plastic
ub s
elongation of the bolt. For this purpose the components have the following characteristics:
— regular nut height according to style 1, see EN ISO 4032; or
— nut with height m = 1 D;
— thread length of the bolt according to ISO 888.
Bolting assemblies in accordance with this document include washers according to EN 14399-6 or to
EN 14399-5 (under the nut only).
NOTE Attention is drawn to the importance of ensuring that the bolting assemblies are correctly used if
satisfactory results are to be obtained. For recommendations concerning proper application, reference to
EN 1090–2 is made.
General requirements and requirements for suitability for preloading are specified in EN 14399-2 and
in Clause 8 of this document.
2 Normative references
The following documents, in whole or
...