Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1:2013)

ISO 898-1:2009 specifies mechanical and physical properties of bolts, screws and studs made of carbon steel and alloy steel when tested at an ambient temperature range of 10 °C to 35 °C. Fasteners — the term used when bolts, screws and studs are considered all together — that conform to its requirements are evaluated at that ambient temperature range. Information is given on fasteners that do not retain the specified mechanical and physical properties at elevated temperatures and/or lower temperatures.
ISO 898-1:2009 excludes certain fasteners that do not fulfil its tensile or torsional requirements because the geometry of their heads reduce the shear area in the head compared to the stress area in the thread. These include fasteners having a low head, with or without external driving feature, a low round or cylindrical head with internal driving feature or a countersunk head with internal driving feature (see 8.2).
It is applicable to bolts, screws and studs made of carbon steel or alloy steel, having a triangular ISO metric screw thread according to ISO 68-1, with a coarse pitch thread M1,6 to M39, and fine pitch thread M8´1 to M39´3, with diameter/pitch combinations according to ISO 261 and ISO 262, having thread tolerances according to ISO 965-1, ISO 965-2 and ISO 965-4.
It is not applicable to set screws and similar threaded fasteners not under tensile stresses (see ISO 898-5).
It does not specify requirements for such properties as weldability, corrosion resistance, resistance to shear stress, torque/clamp force performance, or fatigue resistance.

Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und legiertem Stahl - Teil 1: Schrauben mit festgelegten Festigkeitsklassen - Regelgewinde und Feingewinde (ISO 898-1:2013)

Dieser Teil von ISO 898 legt mechanische und physikalische Eigenschaften von Schrauben aus Kohlenstoff-stahl und legiertem Stahl fest, die in einem Bereich der Umgebungstemperatur von 10 °C bis 35 °C geprüft werden. Schrauben (im Englischen als „fasteners“ bezeichnet, wenn gleichzeitig „bolts“, „screws“ und „studs“ angesprochen werden), die den Anforderungen dieses Teils von ISO 898 entsprechen, werden in diesem Bereich der Umgebungstemperatur bewertet. Es kann sein, dass sie die festgelegten mechanischen und physikalischen Eigenschaften bei höheren Temperaturen (siehe Angaben in Anhang B) und/oder niedrigeren Temperaturen nicht beibehalten.
ANMERKUNG 1   Schrauben, die den Anforderungen dieses Teils von ISO 898 entsprechen, werden für Anwendungen im Bereich zwischen 50 °C und 150 °C eingesetzt. Anwender sollten für Temperaturen außerhalb des Bereiches von 50 °C bis 150 °C sowie bis zu einer Höchsttemperatur von 300 °C einen erfahrenen Metallurgen für Verbindungs¬elemente konsultieren, um die geeignete Wahl für die vorgesehene Anwendung zu treffen.
ANMERKUNG 2   Informationen zur Auswahl und Anwendung von Stählen für den Gebrauch bei niedrigeren und höheren Temperaturen sind z. B. in EN 10269, ASTM F2281 und in ASTM A320/A320M enthalten.
Bestimmte Schrauben erfüllen möglicherweise nicht die in diesem Teil von ISO 898 festgelegten Anforde-rungen an die Belastbarkeit unter Zug oder Torsion, weil wegen der Kopfgeometrie die Scherfläche im Kopf gegenüber dem Spannungsquerschnitt im Gewinde verkleinert ist. Dies betrifft Schrauben mit niedrigen Köpfen oder mit Senkköpfen (siehe 8.2).
Dieser Teil von ISO 898 gilt für Schrauben
-   aus Kohlenstoffstahl und legiertem Stahl,
-   mit Metrischem ISO-Gewinde nach ISO 68-1,
-   mit Regelgewinde M1,6 bis M39 und Feingewinde M81 bis M393,
-   mit Durchmesser-Steigungs-Kombinationen nach ISO 261 und ISO 262 und
-   mit Gewindetoleranzen nach ISO 965-1, ISO 965-2 und ISO 965-4.
Er gilt nicht für Gewindestifte und ähnliche nicht auf Zug beanspruchte Verbindungselemente mit Gewinde (siehe ISO 898-5).
Er legt keine Anforderungen für Eigenschaften fest wie
-   Schweißbarkeit,
-   Korrosionsbeständigkeit,
-   Scherfestigkeit,
-   Drehmoment/Vorspannkraft-Verhalten (für Prüfverfahren, siehe ISO 16047) oder
-   Dauerfestigkeit.

Caractéristiques mécaniques des éléments de fixation en acier au carbone et en acier allié - Partie 1: Vis, goujons et tiges filetées de classes de qualité spécifiées - Filetages à pas gros et filetages à pas fin (ISO 898-1:2013)

L'ISO 898-1:2009 spécifie les caractéristiques mécaniques et physiques des vis, goujons et tiges filetées en acier au carbone et en acier allié, essayés dans la plage de température ambiante de 10 °C à 35 °C. Les éléments de fixation — terme utilisé lorsque les vis, goujons et tiges filetées sont considérés dans leur ensemble — conformes aux exigences de la présente partie de l'ISO 898 sont évalués uniquement dans cette plage de températures ambiantes. Des informations sont données pour les éléments de fixation qui ne conservent pas les caractéristiques mécaniques et physiques spécifiées à des températures élevées et/ou inférieures.
Certains éléments de fixation peuvent ne pas satisfaire aux exigences de l'ISO 898-1:2009 concernant la résistance à la traction ou à la torsion, en raison de la géométrie de la tête (section cisaillée dans la tête inférieure à la section résistante dans le filetage). Ceux-ci comprennent les éléments de fixation à tête réduite, avec ou sans entraînement externe, à tête bombée plate et cylindrique basse avec entraînement interne ou à tête fraisée avec entraînement interne.
La présente partie de l'ISO 898 s'applique aux vis, goujons et tiges filetées en acier au carbone ou en acier allié, à filetage métrique ISO triangulaire conforme à l'ISO 68‑1, de filetage M1,6 à M39 (pour les pas gros) et de filetage M8 x 1 à M39 x 3 (pour les pas fins), de combinaisons diamètre/pas conformes à l'ISO 261 et à l'ISO 262, de tolérance de filetage conforme à l'ISO 965‑1, ISO 965‑2 et ISO 965‑4.
Elle ne s'applique pas aux vis sans tête et éléments de fixation filetés similaires non soumis à des contraintes de traction (voir l'ISO 898‑5).
Elle ne spécifie aucune exigence pour des caractéristiques telles que la soudabilité, la résistance à la corrosion, la résistance au cisaillement, la performance couple/tension, ou la résistance à la fatigue.

Mehanske lastnosti veznih elementov iz ogljikovega in legiranega jekla - 1. del: Vijaki s specificiranim trdnostnim razredom - Grobi in fini navoj (ISO 898-1:2013)

Ta del standarda ISO 898 določa mehanske in fizikalne lastnosti vijakov iz ogljikovega in legiranega jekla, kadar se preskušajo pri temperaturi okolja, in sicer od 10 °C do 35 °C. Vezni elementi (izraz, ki se uporablja za vse vijake skupaj), ki izpolnjujejo zahteve iz tega dela standarda ISO 898, se ovrednotijo pri tem temperaturnem razponu okolja. Vijaki pri višjih temperaturah (glej dodatek B) in/ali nižjih temperaturah morda ne ohranijo opredeljenih mehanskih in fizikalnih lastnosti. OPOMBA 1 Vezni elementi, ki izpolnjujejo zahteve iz tega dela standarda ISO 898, se uporabljajo pri temperaturah od –50 °C do +150 °C. Uporabnikom se priporoča, da se glede ustrezne izbire za določeno uporabo pri temperaturah zunaj območja –50 °C do +150 °C in do najvišje temperature +300 °C posvetujejo z izkušenim metalurgom za vezne elemente. OPOMBA 2 Informacije za izbiro in uporabo jekel za uporabo pri nižjih in višjih temperaturah so na primer na voljo v standardih EN 10269, ASTM F2281 in ASTM A320/A320M. Nekateri vijaki morda ne izpolnjujejo nateznih ali torzijskih zahtev iz tega dela standarda ISO 898, ker geometrija njihovih glav zmanjša strižno površino v glavi v primerjavi s površino obremenitve v navoju. Mednje spadajo tudi vijaki z nizko ali ugrezno glavo (glej točko 8.2). Ta del standarda ISO 898 se uporablja za vijake:
– iz ogljikovega ali legiranega jekla,
– s trikotnim ISO metrskim vijačnim navojem v skladu s standardom ISO 68-1,
– z grobim navojem M1,6 do M39 in drobnim navojem M8×1 do M39×3,
– s kombinacijami premer/navoj v skladu s standardoma ISO 261 in ISO 262 ter
– s tolerancami navojev v skladu s standardi ISO 965-1, ISO 965-2 in ISO 965-4. Ne uporablja se za navojne zatiče in podobne vijake z navojem, ki niso pod natezno obremenitvijo (glej standard ISO 898-5). Standard ne določa zahtev za lastnosti, kot so:
– varivost,
– odpornost proti koroziji,
– odpornost proti strižni napetosti,
– delovanje sile navora/ukleščenja (za preskusno metodo glej standard ISO 16047) ali
– odpornost proti utrujanju.

General Information

Status
Published
Publication Date
22-Jan-2013
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Jan-2013
Completion Date
23-Jan-2013

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SLOVENSKI STANDARD
SIST EN ISO 898-1:2013
01-maj-2013
1DGRPHãþD
SIST EN ISO 898-1:2009
Mehanske lastnosti veznih elementov iz ogljikovega in legiranega jekla - 1. del:

Vijaki s specificiranim trdnostnim razredom - Grobi in fini navoj (ISO 898-1:2013)

Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts,

screws and studs with specified property classes - Coarse thread and fine pitch thread

(ISO 898-1:2013)
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und

legiertem Stahl - Teil 1: Schrauben mit festgelegten Festigkeitsklassen - Regelgewinde

und Feingewinde (ISO 898-1:2013)

Caractéristiques mécaniques des éléments de fixation en acier au carbone et en acier

allié - Partie 1: Vis, goujons et tiges filetées de classes de qualité spécifiées - Filetages à

pas gros et filetages à pas fin (ISO 898-1:2013)
Ta slovenski standard je istoveten z: EN ISO 898-1:2013
ICS:
21.040.01 Navoji na splošno Screw threads in general
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
SIST EN ISO 898-1:2013 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 898-1:2013
---------------------- Page: 2 ----------------------
SIST EN ISO 898-1:2013
EUROPEAN STANDARD
EN ISO 898-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2013
ICS 21.060.10 Supersedes EN ISO 898-1:2009
English Version
Mechanical properties of fasteners made of carbon steel and
alloy steel - Part 1: Bolts, screws and studs with specified
property classes - Coarse thread and fine pitch thread (ISO 898-
1:2013)

Caractéristiques mécaniques des éléments de fixation en Mechanische Eigenschaften von Verbindungselementen

acier au carbone et en acier allié - Partie 1: Vis, goujons et aus Kohlenstoffstahl und legiertem Stahl - Teil 1:

tiges filetées de classes de qualité spécifiées - Filetages à Schrauben mit festgelegten Festigkeitsklassen -

pas gros et filetages à pas fin (ISO 898-1:2013) Regelgewinde und Feingewinde (ISO 898-1:2013)

This European Standard was approved by CEN on 14 January 2013.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 898-1:2013: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 898-1:2013
EN ISO 898-1:2013 (E)
Contents Page

Foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 898-1:2013
EN ISO 898-1:2013 (E)
Foreword

This document (EN ISO 898-1:2013) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in

collaboration with Technical Committee CEN/TC 185 “Fasteners” 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 July 2013, and conflicting national standards shall be withdrawn at the

latest by July 2013.

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 ISO 898-1:2009.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 898-1:2013 has been approved by CEN as EN ISO 898-1:2013 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 898-1:2013
---------------------- Page: 6 ----------------------
SIST EN ISO 898-1:2013
INTERNATIONAL ISO
STANDARD 898-1
Fifth edition
2013-01-15
Mechanical properties of fasteners made
of carbon steel and alloy steel
Part 1:
Bolts, screws and studs with specified
property classes — Coarse thread and
fine pitch thread
Caractéristiques mécaniques des éléments de fixation en acier au
carbone et en acier allié
Partie 1: Vis, goujons et tiges filetées de classes de qualité
spécifiées — Filetages à pas gros et filetages à pas fin
Reference number
ISO 898-1:2013(E)
ISO 2013
---------------------- Page: 7 ----------------------
SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
Contents Page

Foreword ............................................................................................................................................................iv

1 Scope......................................................................................................................................................1

2 Normative references............................................................................................................................2

3 Terms and definitions ...........................................................................................................................3

4 Symbols and abbreviated terms ..........................................................................................................4

5 Designation system for property classes...........................................................................................6

6 Materials.................................................................................................................................................6

7 Mechanical and physical properties....................................................................................................8

8 Applicability of test methods .............................................................................................................12

8.1 General.................................................................................................................................................12

8.2 Loadability of fasteners ......................................................................................................................12

8.3 Manufacturer's test/inspection ..........................................................................................................13

8.4 Supplier's test/inspection...................................................................................................................13

8.5 Purchaser's test/inspection................................................................................................................13

8.6 Feasible tests for groups of fasteners and machined test pieces .................................................14

9 Test methods .......................................................................................................................................21

9.1 Tensile test under wedge loading of finished bolts and screws (excluding studs).....................21

9.2 Tensile test for finished bolts, screws and studs for determination of tensile strength, R .......25

9.3 Tensile test for full-size bolts, screws and studs for determination of elongation after

fracture, A , and stress at 0,0048d non-proportional elongation, R ..............................................27

f pf

9.4 Tensile test for bolts and screws with reduced loadability due to head design ..........................31

9.5 Tensile test for fasteners with waisted shank..................................................................................32

9.6 Proof load test for finished bolts, screws and studs.......................................................................33

9.7 Tensile test for machined test pieces ...............................................................................................35

9.8 Head soundness test ..........................................................................................................................38

9.9 Hardness test.......................................................................................................................................39

9.10 Decarburization test............................................................................................................................41

9.11 Carburization test ................................................................................................................................44

9.12 Retempering test .................................................................................................................................46

9.13 Torsional test.......................................................................................................................................46

9.14 Impact test for machined test pieces ................................................................................................47

9.15 Surface discontinuity inspection.......................................................................................................48

10 Marking.................................................................................................................................................48

10.1 General.................................................................................................................................................48

10.2 Manufacturer's identification mark....................................................................................................49

10.3 Marking and identification of fasteners with full loadability...........................................................49

10.4 Marking and designation of fasteners with reduced loadability ....................................................53

10.5 Marking of packages ...........................................................................................................................53

Annex A (informative) Relationship between tensile strength and elongation after fracture...................54

Annex B (informative) Influence of elevated temperatures on mechanical properties of fasteners........55

Annex C (informative) Elongation after fracture for full-size fasteners, A .................................................56

Bibliography......................................................................................................................................................57

© ISO 2013 – All rights reserved iii
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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 898-1 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners with

metric external thread.

This fifth edition cancels and replaces the fourth edition (ISO 898-1:2009), of which it constitutes a minor

revision.

ISO 898 consists of the following parts, under the general title Mechanical properties of fasteners made of

carbon steel and alloy steel:

⎯ Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread

⎯ Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread

⎯ Part 5: Set screws and similar threaded fasteners with specified hardness classes — Coarse thread and

fine pitch thread

⎯ Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm

It is intended that, upon revision, the main element of the title of Part 7 will be aligned with the main element of the titles

of Parts 1 to 5.
iv © ISO 2013 – All rights reserved
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SIST EN ISO 898-1:2013
INTERNATIONAL STANDARD ISO 898-1:2013(E)
Mechanical properties of fasteners made of carbon steel and
alloy steel
Part 1:
Bolts, screws and studs with specified property classes —
Coarse thread and fine pitch thread
1 Scope

This part of ISO 898 specifies mechanical and physical properties of bolts, screws and studs made of carbon

steel and alloy steel when tested at an ambient temperature range of 10 °C to 35 °C. Fasteners (the term

used when bolts, screws and studs are considered all together) that conform to the requirements of this part of

ISO 898 are evaluated at that ambient temperature range. They might not retain the specified mechanical and

physical properties at elevated temperatures (see Annex B) and/or lower temperatures.

NOTE 1 Fasteners conforming to the requirements of this part of ISO 898 are used in applications ranging from −50 °C

to +150 °C. Users are advised to consult an experienced fastener metallurgist for temperatures outside the range of

−50 °C to +150 °C and up to a maximum temperature of +300 °C when determining appropriate choices for a given

application.

NOTE 2 Information for the selection and application of steels for use at lower and elevated temperatures is given, for

example, in EN 10269, ASTM F2281 and in ASTM A320/A320M.

Certain bolts and screws might not fulfil the tensile or torsional requirements of this part of ISO 898 because

the geometry of their heads reduces the shear area in the head compared to the stress area in the thread.

These include bolts and screws having a low or countersunk head (see 8.2).
This part of ISO 898 is applicable to bolts, screws and studs
⎯ made of carbon steel or alloy steel,
⎯ having triangular ISO metric screw thread in accordance with ISO 68-1,
⎯ with coarse pitch thread M1,6 to M39, and fine pitch thread M8×1 to M39×3,
⎯ with diameter/pitch combinations in accordance with ISO 261 and ISO 262, and

⎯ having thread tolerances in accordance with ISO 965-1, ISO 965-2 and ISO 965-4.

It is not applicable to set screws and similar threaded fasteners not under tensile stress (see ISO 898-5).

It does not specify requirements for such properties as
⎯ weldability,
⎯ corrosion resistance,
⎯ resistance to shear stress,
© ISO 2013 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
⎯ torque/clamp force performance (for test method, see ISO 16047), or
⎯ fatigue resistance.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable to its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads

ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method

ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions

ISO 261, ISO general purpose metric screw threads — General plan

ISO 262, ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts

ISO 273, Fasteners — Clearance holes for bolts and screws
ISO 724, ISO general-purpose metric screw threads — Basic dimensions

ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with

specified property classes — Coarse thread and fine pitch thread

ISO 898-5, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 5: Set screws and

similar threaded fasteners with specified hardness classes — Coarse thread and fine pitch thread

ISO 898-7, Mechanical properties of fasteners — Part 7: Torsional test and minimum torques for bolts and

screws with nominal diameters 1 mm to 10 mm

ISO 965-1, ISO general-purpose metric screw threads — Tolerances — Part 1: Principles and basic data

ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general

purpose external and internal screw threads — Medium quality

ISO 965-4, ISO general purpose metric screw threads — Tolerances — Part 4: Limits of sizes for hot-dip

galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G

after galvanizing
ISO 4042, Fasteners — Electroplated coatings

ISO 6157-1, Fasteners — Surface discontinuities — Part 1: Bolts, screws and studs for general requirements

ISO 6157-3, Fasteners — Surface discontinuities — Part 3: Bolts, screws and studs for special requirements

ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H,

K, N, T)

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Verification and calibration of the force-measuring system

2 © ISO 2013 – All rights reserved
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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coatings
ISO 10684:2004, Fasteners — Hot dip galvanized coatings
ISO 16426, Fasteners — Quality assurance system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
finished fastener

fastener for which all manufacturing steps have been completed, with or without any surface coating and with

full or reduced loadability, and which has not been machined into a test piece
3.2
machined test piece
test piece machined from a fastener to evaluate material properties
3.3
full-size fastener

finished fastener with a shank diameter of d ≈ d or d > d, or screw threaded to the head, or fully threaded stud

s s
3.4
fastener with reduced shank
finished fastener with a shank diameter of d ≈ d
s 2
3.5
fastener with waisted shank
finished fastener with a shank diameter of d < d
s 2
3.6
base metal hardness

hardness closest to the surface (when traversing from core to outside diameter) just before an increase or

decrease occurs, denoting, respectively, carburization or decarburization
3.7
carburization
result of increasing surface carbon to a content above that of the base metal
3.8
decarburization
loss of carbon at the surface of a steel fastener
3.9
partial decarburization

decarburization with sufficient loss of carbon to cause a lighter shade of tempered martensite and a

significantly lower hardness than that of the adjacent base metal, without, however, showing ferrite grains

under metallographic examination
3.10
ferritic decarburization

decarburization with sufficient loss of carbon to cause a lighter shade of tempered martensite and a

significantly lower hardness than that of the adjacent base metal, with the presence of ferrite grains or grain

boundary network under metallographic examination
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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
3.11
complete decarburization

decarburization with sufficient carbon loss to show only clearly defined ferrite grains under metallographic

examination
4 Symbols and abbreviated terms

For the purposes of this document, the symbols and abbreviated terms given in ISO 225 and ISO 965-1, and

the following apply.
A Percentage elongation after fracture (of machined test piece), %
A Elongation after fracture for full-size fastener
A Nominal stress area in thread, mm
s,nom
A Cross-sectional area of waisted shank, mm
b Thread length, mm
b Thread length of stud metal end, mm
d Nominal thread diameter, mm
d Diameter of machined test piece, mm
d Basic minor diameter of external thread, mm
d Basic pitch diameter of external thread, mm
d Minor diameter of external thread, mm
d Transition diameter (internal diameter of the bearing face), mm
d Hole diameter of wedge or block, mm
d Diameter of unthreaded shank, mm
E Height of non-decarburized zone in thread, mm
F Ultimate tensile load, N
F Minimum ultimate tensile load, N
m,min
F Proof load, N
F Load at 0,0048d non-proportional elongation for full-size fastener, N
G Depth of complete decarburization in thread, mm
H Height of fundamental triangle, mm
H Height of external thread in maximum material condition, mm
k Height of the head, mm
K Impact strength, J
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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
l Nominal length, mm
l Total length of fastener before loading, mm
l Total length of fastener after first unloading, mm
l Total length of fastener after second unloading, mm
l Length of unthreaded shank, mm
l Overall length of stud, mm
l Free threaded length of fastener in testing device, mm
L Length of straight portion (of machined test piece), mm
L Original gauge length (of machined test piece), mm
L Total length of machined test piece, mm
L Final gauge length (of machined test piece), mm
∆L Plastic elongation, mm
M Breaking torque, Nm
P Pitch of thread, mm
r Fillet radius, mm
R Lower yield strength for machined test piece, MPa
R Tensile strength, MPa
R Stress at 0,2 % non-proportional elongation for machined test piece, MPa
p0,2
R Stress at 0,0048d non-proportional elongation for full-size fastener, MPa
s Width across flats, mm
S Cross-sectional area of machined test piece before tensile test, mm
S Stress under proof load, MPa
S Cross-sectional area of machined test piece after fracture, mm
Z Percentage reduction of area after fracture for machined test piece, %
α Wedge angle for tensile test under wedge loading
β Angle of the solid block for head soundness test
max Subscript added to symbol to denote maximum value
min Subscript added to symbol to denote minimum value
nom Subscript added to symbol to denote nominal value
© ISO 2013 – All rights reserved 5
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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
5 Designation system for property classes

The symbol for property classes of bolts, screws, and studs consists of two numbers, separated by a dot (see

Tables 1 to 3):

a) the number to the left of the dot consists of one or two digits and indicates 1/100 of the nominal tensile

strength, R , in megapascals (see Table 3, No. 1);
m,nom

b) the number to the right of the dot indicates 10 times the ratio between the nominal yield strength and the

nominal tensile strength, R , as specified in Table 1 (yield strength ratio). The nominal yield strength,

m,nom
as specified in Table 3 (Nos. 2 to 4), is:
⎯ lower yield strength R , or
eL,nom
⎯ nominal stress at 0,2 % non-proportional elongation R , or
p0,2 nom
⎯ nominal stress at 0,0048d non-proportional elongation R .
pf,nom
Table 1 — Ratio of nominal yield strength and nominal tensile strength
Number to the right of dot .6 .8 .9
R R R
eL,nom p0,2,nom pf,nom
or or
0,6 0,8 0,9
R R R
m,nom m,nom m,nom

c) an additional zero to the left of the property class designation indicates that fasteners have reduced

loadability (see 8.2 and 10.4).

EXAMPLE 1 A fastener of nominal tensile strength R = 800 MPa and with a yield strength ratio of 0,8 has the

m,nom
property class designation 8.8.

EXAMPLE 2 A fastener with material properties of property class 8.8 but with reduced loadability is designated by 08.8.

The multiplication of the nominal tensile strength and the yield strength ratio gives the nominal yield strength

in megapascals (MPa).

Marking and labelling of bolts, screws and studs with property classes shall be as specified in 10.3. For

fasteners with reduced loadability, specific marking symbols are specified in 10.4.

The designation system of this part of ISO 898 may be applied to sizes outside the scope of this part of

ISO 898 (e.g. d > 39 mm), provided all applicable requirements in accordance with Tables 2 and 3 are met.

Information on the relationship between the nominal tensile strength and elongation after fracture for each

property class is given in Annex A.
6 Materials

Table 2 specifies limits for the chemical composition of steels and minimum tempering temperatures for the

different property classes of bolts, screws and studs. The chemical composition shall be assessed in

accordance with the relevant International Standards.

NOTE National regulations for the restriction or prohibition of certain chemical elements might also have to be taken

into account in the countries or regions concerned.

For fasteners that are to be hot dip galvanized, the additional material requirements given in ISO 10684 apply.

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SIST EN ISO 898-1:2013
ISO 898-1:2013(E)
Table 2 — Steels
Chemical composition limit
Tempering
temperature
(cast analysis, %)
Property
Material and heat treatment
class
C P S B °C
min. max. max. max. max. min.
c d
4.6
— 0,55 0,050 0,060
4.8
Carbon steel or carbon steel with additives —
0,13 0,55 0,050 0,060
5.6
5.8 — 0,55 0,050 0,060
6.8 0,15 0,55 0,050 0,060
Carbon steel with additives (e.g. Boron or Mn
0,15 0,40 0,025 0,025
or Cr) quenched and tempered
f 0,25 0,55 0,025 0,025
8.8 0,003 425
Carbon steel quenched and tempered
0,20 0,55 0,025 0,025
Alloy steel quenched and tempered
Carbon steel with additives (e.g. Boron or Mn
0,40 0,025 0,025
0,15
or Cr) quenched and tempered
f 0,25 0,55 0,025 0,025
9.8 0,003 425
Carbon steel quenched and tempered
0,20 0,55 0,025 0,025
Alloy steel quenched and tempered
Carbon steel with additives (e.g. Boron or Mn
0,20 0,55 0,025 0,025
or Cr) quenched and tempered
f 0,25 0,55 0,025 0,025
10.9 0,003 425
Carbon steel quenched and tempered
0,20 0,55 0,025 0,025
Alloy steel quenched and tempered
f h i g
12.9 Alloy steel quenched and tempered 0,30 0,50 0,025 0,025 0,003 425
Carbon steel with additives (e.g. Boron or Mn
f h i
0,28 0,50 0,025 0,025 0,003 380
12.9
or Cr or Molybdenum) quenched and tempered
In case of dispute, the product analysis applies.

Boron content can reach 0,005 %, provided non-effective boron is controlled by the addition of titanium a

...

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