SIST EN ISO 898-1:2009
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 898-1:2009)
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 898-1:2009)
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.
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und legiertem Stahl - Teil 1: Schrauben mit festgelegten Festigkeitsklassen - Regelgewinde und Feingewinde (ISO 898-1:2009)
Dieser Teil von ISO 898 legt mechanische und physikalische Eigenschaften von Schrauben aus Kohlenstoffstahl und legiertem Stahl fest, die in einem Bereich der Umgebungstemperatur von 10 °C und 35 °C geprüft werden.
Schrauben, die den Anforderungen dieser Norm 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 dieser Norm entsprechen, wurden für Anwendungen in dem Bereich zwischen -50°C und +150 °C erfolgreich eingesetzt. Anwender sollten für Temperaturen außerhalb des Bereiches von -50°C und +150 °C einen erfahrenen Metallurgen für Verbindungselemente konsultieren, um die geeignete Wahl für die vorgesehene Anwendung zu treffen.
ANMKERKUNG 2 Informationen zur Auswahl und Anwendung von Stählen für den Gebrauch bei niedrigeren Temperaturen sind z. B. in der EN 10269 und in ASTM A320 enthalten.
Bestimmte Schrauben erfüllen möglicherweise nicht die in dieser Norm festgelegten Anforderungen an die Zug- oder Torsionsfestigkeit, weil wegen der Kopfgeometrie die Scherfläche im Kopf gegenüber dem Spannungsquerschnitt im Gewinde verkleinert ist, z. B. Senkköpfe, Linsensenkköpfe und niedrige Zylinderköpfe (siehe 7.2)
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;
- mit Gewindetoleranz nach ISO 965-1, ISO 965-2 und ISO 965-4.
Er gilt nicht für Gewindestifte und ähnliche Verbindungselemente mit Gewinde, die nicht auf Zug beansprucht werden (siehe ISO 898-5).
Er legt keine Anforderungen für Eigenschaften fest wie
- Schweißbarkeit,
- Korrosionsbeständigkeit,
- Scherfestigkeit 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 898-1:2009)
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 898-1:2009)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 898-1:2009
01-junij-2009
1DGRPHãþD
SIST EN ISO 898-1:2001
Mehanske lastnosti veznih elementov iz ogljikovega in legiranega jekla - 1. del:
Vijaki s specificiranim trdnostnim razredom - Grobi in fini navoj (ISO 898-1:2009)
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 898-1:2009)
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und
legiertem Stahl - Teil 1: Schrauben mit festgelegten Festigkeitsklassen - Regelgewinde
und Feingewinde (ISO 898-1:2009)
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 898-1:2009)
Ta slovenski standard je istoveten z: EN ISO 898-1:2009
ICS:
21.040.01 Navoji na splošno Screw threads in general
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
SIST EN ISO 898-1:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 898-1:2009
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SIST EN ISO 898-1:2009
EUROPEAN STANDARD
EN ISO 898-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2009
ICS 21.060.10 Supersedes EN ISO 898-1:1999
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-
1:2009)
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 898-1:2009) Regelgewinde und Feingewinde (ISO 898-1:2009)
This European Standard was approved by CEN on 28 February 2009.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 898-1:2009: E
worldwide for CEN national Members.
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SIST EN ISO 898-1:2009
EN ISO 898-1:2009 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 898-1:2009
EN ISO 898-1:2009 (E)
Foreword
This document (EN ISO 898-1:2009) 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 October 2009, and conflicting national standards shall be withdrawn at
the latest by October 2009.
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 898-1:1999.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 898-1:2009 has been approved by CEN as a EN ISO 898-1:2009 without any modification.
3
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SIST EN ISO 898-1:2009
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SIST EN ISO 898-1:2009
INTERNATIONAL ISO
STANDARD 898-1
Fourth edition
2009-04-01
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 898-1:2009(E)
©
ISO 2009
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
PDF disclaimer
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Published in Switzerland
ii © ISO 2009 – All rights reserved
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SIST EN ISO 898-1:2009
ISO 898-1:2009(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 .5
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 control.13
8.4 Supplier's control .13
8.5 Purchaser's control .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
m
9.3 Tensile test for full-size bolts, screws and studs for determination of elongation after
fracture, A , and stress at 0,004 8 d non-proportional elongation, R .27
f pf
9.4 Tensile test for bolts and screws not expected to break in free threaded length 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 .48
10.3 Marking and designation of fasteners with full loadability .49
10.4 Marking and designation of fasteners which, because of their geometry, have reduced
loadability .53
10.5 Marking of packages .53
Annex A (informative) Relation 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, Α .56
f
Bibliography .57
© ISO 2009 – All rights reserved iii
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SIST EN ISO 898-1:2009
ISO 898-1:2009(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 1, Mechanical
properties of fasteners.
This fourth edition cancels and replaces the third edition (ISO 898-1:1999), which has been technically revised.
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 proof load values — Coarse thread
⎯ Part 5: Set screws and similar threaded fasteners not under tensile stresses
⎯ Part 6: Nuts with specified proof load values — Fine pitch thread
⎯ Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm
iv © ISO 2009 – All rights reserved
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SIST EN ISO 898-1:2009
INTERNATIONAL STANDARD ISO 898-1:2009(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 A 320/A 320M.
Certain fasteners might not fulfil the tensile or torsional requirements of this part of ISO 898-1 because the
geometry of their heads reduces 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).
This part of ISO 898 is applicable to bolts, screws and studs
a) made of carbon steel or alloy steel,
b) having triangular ISO metric screw thread according to ISO 68-1,
c) with coarse pitch thread M1,6 to M39, and fine pitch thread M8×1 to M39×3,
d) with diameter/pitch combinations according to ISO 261 and ISO 262,
e) 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.
© ISO 2009 – All rights reserved 1
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
2 Normative references
The following referenced documents are indispensable for the application 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.
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 designations 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 — Part 2: Nuts with specified proof load values — Coarse
thread
ISO 898-5, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 5: Set screws and
similar threaded fasteners not under tensile stresses
ISO 898-7, Mechanical properties of fasteners — Part 7: Torsional test and minimum torques for bolts and
1)
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 4885:1996, Ferrous products — Heat treatments — Vocabulary
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)
2)
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
1) Under revision.
2) To be published. (Revision of ISO 6892:1998)
2 © ISO 2009 – All rights reserved
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
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
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
s s
stud
3.4
fastener with waisted shank
finished fastener with a shank diameter of d < d
s 2
3.5
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
3.6
decarburization
depletion of carbon from the surface layer of a ferrous product
[ISO 4885:1996]
3.7
partial decarburization
decarburization with loss of carbon sufficient to cause a lighter shade of tempered martensite and significantly
lower hardness than that of the adjacent base metal without, however, showing ferrite grains under
metallographic examination
3.8
complete decarburization
decarburization with sufficient carbon loss to show the presence of clearly defined ferrite grains under
metallographic examination
3.9
carburization
result of increasing surface carbon to a content above that of the base metal
© ISO 2009 – All rights reserved 3
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
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
f
2
A
Nominal stress area in thread, mm
s,nom
2
A
Cross sectional area of waisted shank, mm
ds
b
Thread length, mm
b Thread length of stud (metal) end, mm
m
d Nominal thread diameter, mm
d
Diameter of machined test piece, mm
o
d Basic minor diameter of external thread, mm
1
d Basic pitch diameter of external thread, mm
2
d Minor diameter of external thread, mm
3
d
Transition diameter (internal diameter of the bearing face), mm
a
d Hole diameter of wedge or block, mm
h
d Diameter of unthreaded shank, mm
s
E Height of non-decarburized zone in thread, mm
F
Ultimate tensile load, N
m
F
Minimum ultimate tensile load, N
m,min
F Proof load, N
p
F Load at 0,004 8 d non-proportional elongation for full-size fastener, N
pf
G Depth of complete decarburization in thread, mm
H Height of fundamental triangle, mm
H Height of external thread in maximum material condition, mm
1
k
Height of the head, mm
K
Impact strength, J
v
l Nominal length, mm
l Total length of fastener before loading, mm
o
l Total length of fastener after first unloading, mm
1
l Total length of fastener after second unloading, mm
2
l
Length of unthreaded shank, mm
s
l Overall length of stud, mm
t
l
Free threaded length of fastener in testing device, mm
th
L
Length of straight portion (of machined test piece), mm
c
L
Original gauge length (of machined test piece), mm
o
4 © ISO 2009 – All rights reserved
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
L
Total length of machined test piece, mm
t
L
Final gauge length (of machined test piece), mm
u
∆L Plastic elongation, mm
p
M Breaking torque, Nm
B
P Pitch of thread, mm
r
Fillet radius, mm
R Lower yield strength for machined test piece, MPa
eL
R Tensile strength, MPa
m
R Stress at 0,2 % non-proportional elongation for machined test piece, MPa
p0,2
R Stress at 0,0048 d non-proportional elongation for full-size fastener, MPa
pf
s Width across flats, mm
2
S
Cross-sectional area of machined test piece before tensile test, mm
o
S Stress under proof load, MPa
p
2
S
Cross-sectional area of machined test piece after fracture, mm
u
Z Percentage reduction of area after fracture for machined test piece, %
Wedge angle for tensile test under wedge loading
α
β Angle of the solid block for head soundness test
nom Subscript added to symbol to denote nominal value
max Subscript added to symbol to denote maximum value
min Subscript added to symbol to denote minimum value
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):
⎯ 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
⎯ the number to the right of the dot indicates 10 times the ratio between the nominal yield strength (lower
yield strength), R , or nominal stress at 0,2 % non-proportional elongation, R , or nominal
eL,nom p0,2,nom
stress at 0,0048 d non-proportional elongation, R (see Table 3, Nos. 2 to 4), and the nominal tensile
pf,nom
strength, R , as specified in Table 1 (yield strength ratio).
m,nom
Table 1 — Ratio of nominal yield strength and nominal tensile strength
Number 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
EXAMPLE 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. A fastener with the same material properties but with reduced loadability is designated by
08.8 (see 10.4).
© ISO 2009 – All rights reserved 5
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
The multiplication of the nominal tensile strength and the yield strength ratio gives the nominal yield strength
in megapascals (MPa). Information on the relationship between the nominal tensile strength and elongation
after fracture for each property class is given in Annex A.
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 for 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.
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 will 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.
6 © ISO 2009 – All rights reserved
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SIST EN ISO 898-1:2009
ISO 898-1:2009(E)
Table 2 — Steels
Chemical
Tempering
composition limits
temperature
a
Property
(cast analysis, %)
Material and heat treatment
class
b
C P S °C
B
min. max. max. max. max. min.
c, d
4.6
— 0,55 0,050 0,060
d
4.8
c
Carbon steel or carbon steel with additives 0,13 0,55 0,050 0,060 —
5.6
d
5.8 — 0,55 0,050 0,060
d
6.8 0,15 0,55 0,050 0,060
Carbon steel with additives (e.g. Boron or Mn
e
0,15 0,40 0,025 0,025
or Cr) quenched and tempered
or
f 0,25 0,55 0,025 0,025
8.8 0,003 425
Carbon steel quenched and tempered
or
0,20 0,55 0,025 0,025
g
Alloy steel quenched and tempered
Carbon steel with additives (e.g. Boron or Mn
e
0,15 0,40 0,025 0,025
or Cr) quenched and tempered
or
f 0,25 0,55 0,025 0,025
9.8 0,003 425
Carbon steel quenched and tempered
or
0,20 0,55 0,025 0,025
g
Alloy steel quenched and tempered
Carbon steel with additives (e.g. Boron or Mn
e
0,55 0,025 0,025
0,20
or Cr) quenched and tempered
or
f 0,25 0,55 0,025 0,025
10.9 0,003 425
Carbon steel quenched and t
...
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