EN ISO 898-1:2009

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

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.

Contents Page
Foreword .3

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.

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
ISO 898-1:2009(E)
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ii © ISO 2009 – All rights reserved

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 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

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 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

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 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
A
Nominal stress area in thread, mm
s,nom
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
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
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
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
l Total length of fastener after second unloading, mm
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

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
S
Cross-sectional area of machined test piece before tensile test, mm
o
S Stress under proof load, MPa
p
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 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

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 tempered
or
0,20 0,55 0,025 0,025
g
Alloy steel quenched and tempered
f, h, i
g
12.9 0,30 0,50 0,025 0,025 0,003 425
Alloy steel quenched and tempered
Carbon steel with additives (e.g. Boron or Mn
f, h, i
12.9 0,28 0,50 0,025 0,025 0,003 380
or Cr or Molybdenum) quenched and tempered
a
In case of dispute, the product analysis applies.
b
Boron content can reach 0,005 %, provided that non-effective boron is controlled by addition of titanium and/or aluminium.
c
For cold forged fasteners of property classes 4.6 and 5.6, heat treatment of the wire used for cold forging or of the cold forged
fastener itself may be necessary to achieve required ductility.
d
Free cutting steel is allowed for these property classes with the following maximum sulphur, phosphorus and lead contents:
sulphur 0,34 %; phosphorus 0,11 %; lead 0,35 %.
e
In case of plain carbon boron steel with a carbon content below 0,25 % (cast analysis), the minimum manganese content shall be
0,6 % for property class 8.8 and 0,7 % for 9.8 and 10.9.
f
For the materials of these property classes, there shall be a sufficient hardenability to ensure a structure consisting of
approximately 90 % martensite in the core of the threaded sections for the fasteners in the “as-hardened” condition before tempering.
g
This alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0,30 %, nickel
0,30 %, molybdenum 0,20 %, vanadium 0,10 %. Where elements are specified in combinations of two, three or four and have alloy
contents less than those given above, the limit value to be applied for steel class determination is 70 % of the sum of the individual limit
values shown above for the two, three or four elements concerned.
h
A metallographically detectable white phosphorus enriched layer is not permitted for property class 12.9/12.9. It shall be detected
by a suitable test method.
i
Caution is advised when the use of property class 12.9/12.9 is considered. The capability of the fastener manufacturer, the service
conditions and the wrenching methods should be considered. Environments may cause stress corrosion cracking of fasteners as
processed as well as those coated.
Not specified
ISO 898-1:2009(E)
7 Mechanical and physical properties
3)
The bolts, screws and studs of the specified property classes shall, at ambient temperature , meet all the
applicable mechanical and physical properties according to Tables 3 to 7, regardless of which tests are
performed during manufacturing or final inspection.
Clause 8 sets forth the applicability of test methods for verifying that fasteners of different types and
dimensions fulfil the properties according to Table 3 and Tables 4 to 7.
NOTE 1 Even if the steel properties of the fasteners meet all relevant requirements specified in Tables 2 and 3, some
types of fasteners have reduced loadability due to dimensional reasons (see 8.2, 9.4 and 9.5).
NOTE 2 Although a great number of property classes are specified in this part of ISO 898, this does not mean that all
classes are appropriate for all fasteners. Further guidance for application of the specific property classes is given in the
relevant product standards. For non-standard fasteners, it is advisable to follow as closely as possible the choice already
made for similar standard fasteners.
Table 3 — Mechanical and physical properties of bolts, screws and studs
Property class
12.9/
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9
12.9
No. Mechanical or physical property
d u d > d u
16 16
b
a
mm mm
mm
c
400 500 600 800 900 1 000 1 200
nom.
Tensile strength, R , MPa
m
min. 400 420 500 520 600 800 830 900 1 040 1 220
c
nom. 240 — 300 — — — — — — —
d
2 Lower yield strength, R , MPa
eL
min. 240 — 300 — — — — — — —
c
Stress at 0,2 % non- — — — — — 640 640 720 900 1 080
nom.
proportional elongation,
R , MPa
min. — — — — — 640 660 720 940 1 100
p0,2
c
nom. — 320 — 400 480 — — — — —
Stress at 0,0048 d non-proportional
elongation for full-size fasteners, R , MPa
pf e e e
min. — — — — — — —
340 420 480
f
Stress under proof load, S , MPa nom. 225 310 280 380 440 580 600 650 830 970
p
S /R or
5 p,nom eL min
S /R or
Proof strength ratio 0,94 0,91 0,93 0,90 0,92 0,91 0,91 0,90 0,88 0,88
p,nom p0,2 min
S /R
p,nom pf min
Percentage elongation after fracture for
6 min. 22 — 20 — — 12 12 10 9 8
machined test pieces, A, %
Percentage reduction of area after
7 min. — 52 48 48 44
fracture for machined test pieces, Z, %
Elongation after fracture for full-size
fasteners, A
8 min. — 0,24 — 0,22 0,20 — — — — —
f
(see also Annex C)
9 Head soundness No fracture
3) Impact strength is tested at a temperature of −20 °C (see 9.14).
8 © ISO 2009 – All rights reserved

ISO 898-1:2009(E)
Table 3 (continued)
Property class
12.9/
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9
12.9
No. Mechanical or physical property
d u d > d u
16 16 m
b
a
mm m
mm
min. 120 130 155 160 190 250 255 290 320 385
Vickers hardness, HV
F W 98 N
g
max. 250 320 335 360 380 435
min. 114 124 147 152 181 238 242 276 304 366
Brinell hardness, HBW
F = 30 D
g
max. 209 238 304 318 342 361 414
min. 67 71 79 82 89 —
Rockwell hardness, HRB
g
max. 99,5 —
95,0
min. — 22 23 28 32 39
Rockwell hardness, HRC
max. — 32 34 37 39 44
h h, i h, j
13 Surface hardness, HV 0,3 max. —

14 Height of non-decarburized thread zone,
1 2 3
min. — /2 H /3 H /4 H
1 1 1
E, mm
Depth of complete decarburization in the
max. — 0,015
thread, G, mm
15 Reduction of hardness after retempering, HV max. — 20
Breaking torque, M , N⋅m
16 min. — in accordance with ISO 898-7
B
k, l
m
17 Impact strength, K , J min. 27 — 27 27 27 27
—
V
ISO
n
18 Surface integrity in accordance with
ISO 6157-1
6157-3
a
Values do not apply for structural bolting.
b
For structural bolting d W M12.
c
Nominal values are specified only for the purpose of the designation system for property classes. See Clause 5.
d
In cases where the lower yield strength R cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional
eL
elongation R .
p0,2
e
For the property classes 4.8, 5.8 and 6.8 the values for R are under investigation. The present values are given for calculation
pf min
of the proof stress ratio only. They are not test values.
f
Proof loads are specified in Tables 5 and 7.
g
Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.
h
Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination
of both surface hardness and core hardness are carried out with HV 0,3.
i
Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable.
j
Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable.
k
Values are determined at a test temperature of −20 °C, see 9.14.
l
Applies to d W 16 mm.
m
Value for K is under investigation.
V
n
Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.

ISO 898-1:2009(E)
Table 4 — Minimum ultimate tensile loads — ISO metric coarse pitch thread
Nominal Property class
a stress area
Thread
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9

b
A
d
s,nom
Minimum ultimate tensile load, F (A × R ), N
mm
m min s, nom m, min
M3 5,03 2 010  2 110  2 510  2 620 3 020 4 020    4 530  5 230   6 140
M3,5 6,78 2 710  2 850  3 390  3 530 4 070  5 420    6 100  7 050   8 270
M4 8,78 3 510  3 690  4 390  4 570 5 270 7 020    7 900  9 130  10 700
M5 14,2 5 680  5 960  7 100  7 380 8 520 11 350   12 800 14 800   17 300
M6 20,1 8 040  8 440  10 000  10 400 12 100 16 100   18 100 20 900   24 500
M7 28,9 11 600  12 100  14 400  15 000 17 300 23 100   26 000 30 100   35 300
c c c c
M8 36,6 14 600 15 400  18 300 19 000 22 000 29 200  32 900  38 100  44 600
c c c c
M10 58 23 200 24 400  29 000 30 200 34 800 46 400  52 200  60 300  70 800
d
M12 84,3 33 700  35 400  42 200  43 800 50 600 67 400  75 900 87 700  103 000
d
M14 115 46 000  48 300  57 500  59 800  69 000 92 000 104 000 120 000  140 000
d
M16 157 62 800  65 900  78 500   81 600  94 000 125 000 141 000 163 000  192 000
M18 192 76 800  80 600  96 000   99 800 115 000 159 000  — 200 000  234 000
M20 245 98 000  103 000  122 000  127 000 147 000 203 000  — 255 000  299 000
M22 303 121 000  127 000  152 000  158 000 182 000 252 000  — 315 000  370 000
M24 353 141 000  148 000  176 000  184 000 212 000 293 000  — 367 000  431 000
M27 459 184 000  193 000  230 000  239 000 275 000 381 000  — 477 000  560 000
M30 561 224 000  236 000  280 000  292 000 337 000 466 000  — 583 000  684 000
M33 694 278 000  292 000  347 000  361 000 416 000 576 000  — 722 000  847 000
M36 817 327 000  343 000  408 000  425 000 490 000 678 000  — 850 000  997 000
M39 976 390 000  410 000  488 000  508 000 586 000 810 000  — 1 020 000  1 200 000
a
Where no thread pitch is indicated in a thread designation, coarse pitch is specified.
b
To calculate A , see 9.1.6.1.
s,nom
c
For fasteners with thread tolerance 6az according to ISO 965-4 subject to hot dip galvanizing, reduced values in accordance
with ISO 10684:2004, Annex A, apply.
d
For structural bolting 70 000 N (for M12), 95 500 N (for M14) and 130 000 N (for M16).
10 © ISO 2009 – All rights reserved

ISO 898-1:2009(E)
Table 5 — Proof loads — ISO metric coarse pitch thread
Nominal Property class
stress
a
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9
Thread
area
d
b
A
s,nom
Proof load, F (A × S ), N
p s,nom p,nom
mm
M3 5,03 1 130  1 560  1 410  1 910 2 210 2 920  3 270  4 180  4 880
M3,5 6,78 1 530  2 100  1 900  2 580 2 980 3 940  4 410  5 630  6 580
M4 8,78 1 980  2 720  2 460  3 340 3 860 5 100  5 710  7 290  8 520
M5 14,2 3 200  4 400  3 980  5 400 6 250 8 230  9 230  11 800  13 800
M6 20,1 4 520  6 230  5 630  7 640 8 840 11 600  13 100  16 700  19 500
M7 28,9 6 500  8 960  8 090  11 000 12 700 16 800  18 800  24 000  28 000
c c c c
M8 36,6 8 240 11 400  10 200 13 900 16 100 21 200 23 800  30 400 35 500
c c c c
M10 58 13 000 18 000  16 200 22 000 25 500 33 700 37 700  48 100 56 300
d
M12 84,3 19 000  26 100  23 600  32 000 37 100 48 900 54 800  70 000  81 800
d
M14 115 25 900  35 600  32 200  43 700 50 600 66 700  74 800 95 500  112 000
d
M16 157 35 300  48 700  44 000  59 700 69 100 91 000 102 000 130 000  152 000
M18 192 43 200  59 500  53 800  73 000 84 500 115 000  — 159 000  186 000
M20 245 55 100  76 000  68 600  93 100 108 000 147 000  — 203 000  238 000
M22 303 68 200  93 900  84 800  115 000 133 000 182 000  — 252 000  294 000
M24 353 79 400  109 000  98 800  134 000 155 000 212 000  — 293 000  342 000
M27 459 103 000  142 000  128 000  174 000 202 000 275 000  — 381 000  445 000
M30 561 126 000  174 000  157 000  213 000 247 000 337 000  — 466 000  544 000
M33 694 156 000  215 000  194 000  264 000 305 000 416 000  — 576 000  673 000
M36 817 184 000 253 000  229 000 310 000 359 000 490 000 — 678 000 792 000
M39 976 220 000 303 000  273 000 371 000 429 000 586 000 — 810 000 947 000
a
Where no thread pitch is indicated in a thread designation, coarse pitch is specified.
b
To calculate A , see 9.1.6.1.
s,nom
c
For fasteners with thread tolerance 6az according to ISO 965-4 subject to hot dip galvanizing, reduced values in accordance
with ISO 10684:2004, Annex A, apply.
d
For structural bolting 50 700 N (for M12), 68 800 N (for M14) and 94 500 N (for M16).
Table 6 — Minimum ultimate tensile loads — ISO metric fine pitch thread
Nominal Property class
stress
Thread 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9
area
d × P
a
A
s,nom
Minimum ultimate tensile load, F (A × R ), N
m min s,nom m,min
mm
M8 × 1 39,2 15 700 16 500 19 600 20 400 23 500 31 360 35 300 40 800 47 800
M10 × 1,25 61,2 24 500 25 700 30 600 31 800 36 700 49 000 55 100 63 600 74 700
M10 × 1 64,5 25 800 27 100 32 300 33 500 38 700 51 600 58 100 67 100 78 700
M12 × 1,5 88,1 35 200 37 000 44 100 45 800 52 900 70 500 79 300 91 600 107 000
M12 × 1,25 92,1 36 800 38 700 46 100 47 900 55 300 73 700 82 900 95 800 112 000
M14 × 1,5 125 50 000 52 500 62 500 65 000 75 000 100 000 112 000 130 000 152 000
M16 × 1,5 167 66 800 70 100 83 500 86 800 100 000 134 000 150 000 174 000 204 000
M18 × 1,5 216 86 400 90 700 108 000 112 000 130 000 179 000 — 225 000 264 000
M20 × 1,5 272 109 000 114 000 136 000 141 000 163 000 226 000 — 283 000 332 000
M22 × 1,5 333 133 000 140 000 166 000 173 000 200 000 276 000 — 346 000 406 000
M24 × 2 384 154 000 161 000 192 000 200 000 230 000 319 000 — 399 000 469 000
M27 × 2 496 198 000 208 000 248 000 258 000 298 000 412 000 — 516 000 605 000
M30 × 2 621 248 000 261 000 310 000 323 000 373 000 515 000 — 646 000 758 000
M33 × 2 761 304 000 320 000 380 000 396 000 457 000 632 000 — 791 000 928 000
M36 × 3 865 346 000 363 000 432 000 450 000 519 000 718 000 — 900 000 1 055 000
M39 × 3 1 030 412 000 433 000 515 000 536 000 618 000 855 000 — 1 070 000 1 260 000
a
To calculate A , see 9.1.6.1.
s,nom
ISO 898-1:2009(E)
Table 7 — Proof loads — ISO metric fine pitch thread
Nominal Property class
stress
Thread 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9
area
d × P
a
A
s,nom
Proof load, F (A × S ), N
p s,nom p,nom
mm
M8 × 1 39,2   8 820  12 200  11 000  14 900 17 200 22 700 25 500  32 500  38 000
M10 × 1,25 61,2  13 800  19 000  17 100  23 300 26 900 35 500 39 800  50 800  59 400
64,5  14 500  20 000  18 100  24 500 28 400 37 400 41 900  53 500  62 700
M10 × 1
M12 × 1,5
88,1  19 800  27 300  24 700  33 500 38 800 51 100 57 300  73 100  85 500
M12 × 1,25 92,1  20 700  28 600  25 800  35 000 40 500 53 400 59 900  76 400  89 300
M14 × 1,5 125  28 100  38 800  35 000  47 500 55 000 72 500 81 200 104 000 121 000
M16 × 1,5 167  37
...