EN ISO 898-1:1999
(Main)Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs (ISO 898-1:1999)
Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs (ISO 898-1:1999)
This part of ISO 898 specifies the mechanical properties of bolts, screws and studs when tested at room temperature (see ISO 1). Properties will vary at higher and lower temperature. This part of ISO 898 applies to bolts, screws and studs - with nominal thread diameter [d ? 39 mm] (coarse and fine pitch); - with triangular ISO thread according to ISO 68; - with diameter/pitch combinations according to ISO 261 and ISO 262; - with thread tolerance according to ISO 965-1 and ISO 965-2; - of any shape; - made of carbon steel or alloy steel. It does not apply to set screws and similar threaded fasteners (see ISO 898-5). It does not specify requirements for such properties as - wedability; - corrosion-resistance (see ISO 3506); - ability to whistand temperatures above + 300 øC or below - 50 øC. NOTE : The designation system of this part of ISO 898 may be used for sizes outside the limits laid down in the clause (e.g. d > 39 mm), provided that all mechanical requirements of the property classes are met.
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und legiertem Stahl - Teil 1: Schrauben (ISO 898-1:1999)
Dieser Teil von ISO 898 legt die mechanischen Eigenschaften von Schrauben aus Kohlenstoffstahl und legiertem Stahl bei Prüfung in einem Bereich der Umgebungstemperatur von 10°C bis 35°C fest. Produkte, die den Anforderungen dieser norm entsprechen, werden nur im Bereich der Umgebungstemperatur bewertet und können ihre mechanischen und physikalischen Eigenschaften bei höheren oder niedrigeren Temperaturen verändern.
Caractéristiques mécaniques des éléments de fixation en acier au carbone et en acier allié - Partie 1:Vis et goujons (ISO 898-1:1999)
Mehanske lastnosti veznih elementov iz ogljikovega ali legiranega jekla - 1. del: Vijaki, zatiči in stebelni vijaki (ISO 898-1:1999)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 898-1:2001
01-julij-2001
1DGRPHãþD
SIST EN 20898-1:1996
0HKDQVNHODVWQRVWLYH]QLKHOHPHQWRYL]RJOMLNRYHJDDOLOHJLUDQHJDMHNODGHO
9LMDNL]DWLþLLQVWHEHOQLYLMDNL ,62
Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts,
screws and studs (ISO 898-1:1999)
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und
legiertem Stahl - Teil 1: Schrauben (ISO 898-1:1999)
Caractéristiques mécaniques des éléments de fixation en acier au carbone et en acier
allié - Partie 1:Vis et goujons (ISO 898-1:1999)
Ta slovenski standard je istoveten z: EN ISO 898-1:1999
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
SIST EN ISO 898-1:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 898-1:2001
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SIST EN ISO 898-1:2001
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SIST EN ISO 898-1:2001
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SIST EN ISO 898-1:2001
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SIST EN ISO 898-1:2001
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SIST EN ISO 898-1:2001
INTERNATIONAL ISO
STANDARD 898-1
Third edition
1999-08-01
Mechanical properties of fasteners made of
carbon steel and alloy steel —
Part 1:
Bolts, screws and studs
Caractéristiques mécaniques des éléments de fixation en acier au carbone
et en acier allié —
Partie 1: Vis et goujons
A
Reference number
ISO 898-1:1999(E)
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SIST EN ISO 898-1:2001
ISO 898-1:1999(E)
Contents Page
1 Scope .1
2 Normative references .2
3 Designation system.2
4 Materials .3
5 Mechanical and physical properties .3
6 Mechanical and physical properties to be determined.7
7 Minimum ultimate tensile loads and proof loads .9
8 Test methods.12
8.1 Tensile test for machined test pieces.12
8.2 Tensile test for full-size bolts, screws and studs.13
8.3 Torsional test .14
8.4 Hardness test .14
8.5 Proof load test for full-size bolts and screws .14
8.6 Test for tensile strength under wedge loading of full-size bolts and screws (not studs).16
8.7 Impact test for machined test pieces.17
8.8 Head soundness test for full-size bolts and screws with d < 10 mm and with lengths too short to permit
wedge load testing .17
8.9 Decarburization test: evaluation of surface carbon condition.18
8.10 Retempering test.21
8.11 Surface discontinuity inspection .21
9 Marking .21
9.1 Manufacturer's identification marking.21
9.2 Marking symbols for property class .21
© ISO 1999
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
9.3 Identification . 22
9.4 Marking of bolts and screws with left-hand thread. 24
9.5 Alternative marking . 25
9.6 Marking of packages . 25
Annex A (informative) Lower yield stress or stress at 0,2 % non-proportional elongation at elevated
temperature.26
iii
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(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.
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.
International Standard ISO 898-1 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1,
Mechanical properties of fasteners.
This third edition cancels and replaces the second edition (ISO 898-1:1988) 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 nuts
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 diameter from 1 mm to 10 mm
Annex A of this part of ISO 898 is for information only.
iv
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SIST EN ISO 898-1:2001
INTERNATIONAL STANDARD © ISO ISO 898-1:1999(E)
Mechanical properties of fasteners made of carbon steel and
alloy steel —
Part 1:
Bolts, screws and studs
1 Scope
This part of ISO 898 specifies the mechanical 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.
Products conforming to the requirements of this part of ISO 898 are evaluated only in the ambient temperature range
and may not retain the specified mechanical and physical properties at higher and lower temperatures. Attention is
drawn to annex A which provides examples of lower yield stress and stress at 0,2 % non-proportional elongation at
elevated temperatures.
At temperatures lower than the ambient temperature range, a significant change in the properties, particularly impact
strength, may occur. When fasteners are to be used above or below the ambient temperature range it is the
responsibility of the user to ensure that the mechanical and physical properties are suitable for his particular service
conditions.
Certain fasteners may not fulfill the tensile or torsional requirements of this part of ISO 898 because of the geometry of
the head which reduces the shear area in the head as compared to the stress area in the thread such as countersunk,
raised countersunk and cheese heads (see clause 6).
This part of ISO 898 applies to bolts, screws and studs
with coarse pitch thread M1,6 to M39, and fine pitch thread M8 3 1 to M39 3 3;
with triangular ISO thread in accordance with ISO 68-1;
with diameter/pitch combinations in accordance with ISO 261 and ISO 262;
with thread tolerance in accordance with ISO 965-1 and ISO 965-2;
made of carbon steel or alloy steel.
It does not apply 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;
ability to withstand temperatures above 1 300 °C (1 250 °C for 10.9) or below 2 50 °C;
resistance to shear stress;
fatigue resistance.
NOTE The designation system of this part of ISO 898 may be used for sizes outside the limits laid down in this clause (e.g.
d 39 mm), provided that all mechanical requirements of the property classes are met.
.
1
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO
898. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to
agreements based on this part of ISO 898 are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International
Standards.
ISO 68-1:1998, ISO general purpose screw threads – Basic profile – Part 1: Metric screw threads.
ISO 83:1976, Steel – Charpy impact test (U-notch).
ISO 261:1998, ISO general purpose metric screw threads – General plan.
ISO 262:1998, ISO general purpose metric screw threads – Selected sizes for screws, bolts and nuts.
ISO 273:1979, Fasteners – Clearance holes for bolts and screws.
ISO 724:1978, ISO general purpose metric screw threads – Basic dimensions.
ISO 898-2:1992, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts with
specified proof load values – Coarse thread.
ISO 898-5:1998,
Mechanical properties of fasteners made of carbon steel and alloy steel – Part 5: Set screws and
similar threaded fasteners not under tensile stresses.
ISO 898-7:1992, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 7: Torsional test
and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm.
ISO 965-1:1998, ISO general purpose metric screw threads – Tolerances – Part 1: Principles and basic data.
ISO 965-2:1998, ISO general purpose metric screw threads – Tolerances – Part 2: Limits of sizes for general
purpose external and internal screw threads – Medium quality.
ISO 6157-1:1988, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements.
ISO 6157-3:1988, Fasteners – Surface discontinuities – Part 3: Bolts, screws and studs for special requirements.
ISO 6506:1981, Metallic materials – Hardness test – Brinell test.
ISO 6507-1:1997, Metallic material – Hardness test – Vickers test – Part 1: Test method.
ISO 6508:1986, Metallic materials – Hardness test – Rockwell test (scales A - B - C - D - E - F - G - H - K).
ISO 6892:1998, Metallic materials – Tensile testing at ambient temperature.
3 Designation system
The designation system for property classes of bolts, screws and studs is shown in table 1. The abscissae show the
nominal tensile strength values, R , in newtons per square millimetre, while the ordinates show those of the minimum
m
elongation after fracture, A , as a percentage.
min
The property class symbol consists of two figures:
the first figure indicates 1/100 of the nominal tensile strength in newtons per square millimetre (see 5.1 in
table 3);
the second figure indicates 10 times the ratio between lower yield stress R (or stress at 0,2 % non-
eL
proportional elongation R ) and nominal tensile strength R (yield stress ratio).
p0,2 m, nom
2
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
The multiplication of these two figures will give 1/10 of the yield stress in newtons per square millimetre.
The minimum lower yield stress R (or minimum stress at 0,2 % non-proportional elongation R ) and
eL, min. p0,2, min.
minimum tensile strength R are equal to or greater than the nominal values (see table 3).
m, min.
Materials
4
Table 2 specifies steels and tempering temperatures for the different property classes of bolts, screws and studs.
The chemical composition shall be assessed in accordance with the relevant ISO standards.
5 Mechanical and physical properties
When tested by the methods described in clause 8, the bolts, screws and studs shall, at ambient temperature, have the
mechanical and physical properties set out in table 3.
3
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
Table 1 —
System of coordinates
Nominal tensile strength
R 300 400 500 600 700 800 900 1 000 1 200 1 400
m, nom
2
N/mm
7
8
6.8 12.9
9
10.9
10
a
5.8 9.8
12
8.8
14
Minimum elongation after 4.8
fracture, A percent 16
min
18
20
5.6
22
4.6
25
3.6
30
Relationship between yield stress and tensile strength
Second figure of symbol .6 .8 .9
b
60 80 90
Lower yield stress
R
eL
·100 %
Nominal tensile strength
R
m, nom
or
b
Stress at 0,2 % non-proportional elongation R
p0,2
·100 %
Nominal tensile strength R
m,nom
NOTE 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 items. Further guidance for application of the specific property classes is given in the
relevant product standards. For non-standard items, it is advisable to follow as closely as possible the choice already
made for similar standard items.
a
Applies only to thread diameter d < 16 mm.
b
Nominal values according to table 3 apply.
4
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
Table 2 — Steels
Property Material and treatment Chemical composition limits Tempering
class temperature
(check analysis) % (m/m)
a
CP SB °C
min. max. max. max. max. min.
b
3.6 Carbon steel – 0,20 0,05 0,06 0,003 –
b
4.6 – 0,55 0,05 0,06 0,003 –
b
4.8
0,13 0,55 0,05 0,06 –
5.6
b
5.8 – 0,55 0,05 0,06 0,003
b
6.8
c d
Carbon steel with additives (e.g. B, Mn or Cr) 0,40 0,035 0,035 0,003 425
8.8 0,15
quenched and tempered
Carbon steel quenched and tempered 0,25 0,55 0,035 0,035
d
9.8 Carbon steel with additives (e.g. B, Mn or Cr) 0,35 0,035 0,035 0,003 425
0,15
quenched and tempered
Carbon steel quenched and tempered 0,25 0,55 0,035 0,035
e f d
Carbon steel with additives (e.g. B, Mn or Cr) 0,35 0,035 0,035 0,003 340
10.9 0,15
quenched and tempered
f
10.9 Carbon steel quenched and tempered 0,25 0,55 0,035 0,035 0,003 425
d
Carbon steel with additives (e.g. B, Mn or Cr) 0,20 0,55 0,035 0,035
quenched and tempered
g
Alloy steel quenched and tempered 0,20 0,55 0,035 0,035
f h i g
12.9 Alloy steel quenched and tempered 0,28 0,50 0,035 0,035 0,003 380
a
Boron content can reach 0,005 % provided that non-effective boron is controlled by addition of titanium and/or aluminium.
b
Free cutting steel is allowed for these property classes with the following maximum sulfur, phosphorus and lead
contents: sulfur 0,34 %; phosphorus 0,11 %; lead 0,35 %.
c
For nominal diameters above 20 mm the steels specified for property classe 10.9 may be necessary in order to achieve
sufficient hardenability.
d
In case of plain carbon boron steel with a carbon content below 0,25 % (ladle analysis), the minimum manganese
content shall be 0,6 % for property class 8.8 and 0,7 % for 9.8, 10.9 and 10.9.
e
Products shall be additionally identified by underlining the symbol of the property class (see clause 9). All properties of 10.9
as specified in table 3 shall be met by 10.9, however, its lower tempering temperature gives it different stress relaxation
characteristics at elevated temperatures (see annex A).
f
For the materials of these property classes, it is intended that there should 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 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 phosphorous enriched layer is not permitted for property class 12.9 on surfaces
subjected to tensile stress.
i
The chemical composition and tempering temperature are under investigation.
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
Table 3 — Mechanical and physical properties of bolts, screws and studs
Property class
a b
8.8 9.8
Sub-clause Mechanical and physical property 3.6 4.6 4.8 5.6 5.8 6.8 10.9 12.9
c c
number
d < 16 d > 16
mm mm
2
5.1 Nominal tensile strength, R N/mm 300 400 500 600 800 800 900 1 000 1 200
m, nom
d e 2
5.2 Minimum tensile strength, N/mm 330 400 420 500 520 600 800 830 900 1 040 1 220
R
m, min
min. 95 120 130 155 160 190 250 255 290 320 385
5.3 Vickers hardness, HV
f
max. 250 320 335 360 380 435
F > 98 N
220
Brinell hardness, HB min. 90 114 124 147 152 181 238 242 276 304 366
5.4
2 f
max. 238 304 318 342 361 414
F = 30 D 209
min. HRB 52 67 71 79 82 89 — — — — —
HRC — — — — — — 22 23 28 32 39
5.5 Rockwell hardness, HR
f
max. HRB 95,0 99,5 — — — — —
HRC — — 32 34 37 39 44
g
5.6 Surface hardness, HV 0,3 max. —
nom. 180 240 320 300 400 480 — — — — —
5.7
Lower yield stress
h 2
R , N/mm min. 190 240 340 300 420 480 — — — — —
eL
5.8 nom. — — 640 640 720 900 1 080
Stress at 0,2 % non-proportional
i 2
elongation R , N/mm
min. — — 640 660 720 940 1 100
p0,2
/ or / 0,94 0,94 0,91 0,93 0,90 0,92 0,91 0,91 0,90 0,88 0,88
5.9 S R S R
p eL p p0,2
2
Stress under proof load, 180 225 310 280 380 440 580 600 650 830 970
S
N/mm
p
5.10 Nm min. — See ISO 898-7
Breaking torque, M
B
5.11 Percent elongation after fracture, A min. 25 22 — 20 — — 12 12 10 9 8
Reduction area after fracture, Z % min. — 52 48 48 44
5.12
e The values for full size bolts and screws (no studs) shall not be smaller than the minimum values for tensile strength
5.13
Strength under wedge loading
shown in 5.2
5.14 Impact strength, KU J min. — 25 — 30 30 25 20 15
5.15 Head soundness No fracture
5.16 Minimum height of non-decarburized
thread zone, E —
1 2 3
H H H
1 1 1
2 3 4
Maximum depth of complete mm — 0,015
decarburization, G
5.17 Hardness after retempering — Reduction of hardness 20 HV maximum
5.18 Surface integrity In accordance with ISO 6157-1 or ISO 6157-3 as appropriate
a
d
For bolts of property class 8.8 in diameters < 16 mm, there is an increased risk of nut stripping in the case of inadvertent over-tightening inducing a load in excess of proof
load. Reference to ISO 898-2 is recommended.
b
d .
Applies only to nominal thread diameters < 16 mm
c
.
For structural bolting the limit is 12 mm
d
l d l d
Minimum tensile properties apply to products of nominal length > 2,5 . Minimum hardness applies to products of length , 2,5 and other products which cannot be tensile-
tested (e.g. due to head configuration).
e
R ,
When testing full-size bolts, screws and studs, the tensile loads, which are to be applied for the calculation of shall meet the values given in tables 6 and 8.
m
f
A hardness reading taken at the end of bolts, screws and studs shall be 250 HV, 238 HB or 99,5 HRB maximum.
g
Surface hardness shall not be more than 30 Vickers points above the measured core hardness on the product when readings of both surface and core are carried out at HV 0,3.
.
For property class 10.9, any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable
h
R R .
In cases where the lower yield stress cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation For the property classes
eL p0,2
R
4.8, 5.8 and 6.8 the values for are given for calculation purposes only, they are not test values.
eL
i
The yield stress ratio according to the designation of the property class and the minimum stress at 0,2 % non-proportional elongation R apply to machined test specimens.
p0,2
These values if received from tests of full size bolts and screws will vary because of processing method and size effects.
6
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
6 Mechanical and physical properties to be determined
Two test programmes, A and B, for mechanical and physical properties of bolts, screws and studs, using the
methods described in clause 8, are set out in table 5. Regardless of the choice of test programme, all requirements
of table 3 shall be met.
The application of programme B is always desirable, but is mandatory for products with ultimate tensile loads less
than 500 kN if the application of programme A is not explicitly agreed.
Programme A is suitable for machined test pieces and for bolts with a shank area less than the stress area.
Table 4 — Key to test programmes (see table 5)
Size
Bolts and screws with thread diameter Bolts and screws with thread diameter
d < 3 mm d . 3 mm
a
and length l > d
2,5
or length l , 2,5 d
Test decisive
m
•
for acceptance
a
Also bolts and screws with special head or shank configurations which are weaker than the threaded section.
7
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
Table 5 — Test programmes A and B for acceptance purposes
(These procedures apply to mechanical but not chemical properties)
Property Test programme A Test programme B
Test method Property class Test method Property class
Test
group 3.6, 4.6 8.8, 9.8 3.6, 4.6 8.8, 9.8
5.6 10.9 4.8, 5.6 10.9
12.9 5.8, 6.8 12.9
a
I 5.2 Minimum tensile strength, 8.1 Tensile test 8.2 Tensile test
•• ••
R
m, min.
b c c
5.3 Minimum hardness 8.4 Hardness test mm 8.4 Hardness test mm
and
5.4
and
5.5
Maximum hardness
• • • •
mmmm
5.6 Maximum surface hardness
•
•
mm
II 5.7 Minimum lower yield stress 8.1 Tensile test
•
d
R
eL,.min.
5.8 Stress at 0,2 % non- 8.1 Tensile test
•
proportional elongation,
d
R
p0,2
5.9 Stress under proof load, S 8.5 Proof load test
p
••
em5.10 Breaking torque, M 8.3
Torsional test
B
III 5.11 Minimum percent elongation 8.1 Tensile test
d
••
after fracture,
A
min
5.12 Minimum reduction of area 8.1 Tensile test
after fracture Z
•
min
5.13 Strength under wedge 8.6 Wedge loading
f a
••
loading test
g
IV h
5.14 Minimum impact strength, KU 8.7 Impact test
• •
i mm
5.15 8.8 Head soundness
Head soundness
test
V 5.16 Maximum decarburized 8.9 Decarburization 8.9 Decarburization
• •
zone test test
mm
j j
5.17 Hardness after 8.10 Retempering test 8.10 Retempering test
• •
retemperingmm
Surface discontinuity
5.18 Surface integrity 8.11 8.11 Surface discontinuity
• • • •
inspection
inspectionmmmm
a
If the wedge loading test is satisfactory, the axial tensile test is not required.
b
Minimum hardness applies only to products of nominal length l , 2,5 d and other products which cannot be tensile tested or torsional tested (e.g. due to head
configuration).
c
Hardness may be Vickers, Brinell or Rockwell. In case of doubt, the Vickers hardness test is decisive for acceptance.
d
Only for bolts or screws with length l > 6d.
e
Only if bolts or screws cannot be tensile tested.
f
Special head bolts and screws with configurations which are weaker than the threaded section are excluded from wedge tensile testing requirements.
g
Only for bolts, screws and studs with thread diameters d >16 mm and only if required by the purchaser.
h
Only property class 5.6.
i
Only for bolts and screws with thread diameters d <10 mm and lengths too short to permit wedge load testing
j
Test not mandatory, to be applied as a referee test in the case of dispute only.
8
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
7 Minimum ultimate tensile loads and proof loads
See tables 6, 7, 8 and 9.
Table 6 — Minimum ultimate tensile loads – ISO metric coarse pitch thread
Nominal
a stress
Thread Property class
area
b
A
(d) s, nom
2
mm
3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9
Minimum ultimate tensile load (A 3 R ), N
s, nom m, min
M3 5,03 1 660 2 010 2 110 2 510 2 620 3 020 4 020 4 530 5 230 6 140
M3,5 6,78 2 240 2 710 2 850 3 390 3 530 4 070 5 420 6 100 7 050 8 270
M4 8,78 2 900 3 510 3 690 4 390 4 570 5 270 7 020 7 900 9 130 10 700
14,2 4 690 5 680 5 960 7 100 7 380 8 520 11 350 12 800 14 800 17 300
M5
M6 20,1 6 630 8 040 8 440 10 000 10 400 12 100 16 100 18 100 20 900 24 500
M7 28,9 9 540 11 600 12 100 14 400 15 000 17 300 23 100 26 000 30 100 35 300
M8 36,6 12 100 14 600 15 400 18 300 19 000 22 000 29 200 32 900 38 100 44 600
58 19 100 23 200 24 400 29 000 30 200 34 800 46 400 52 200 60 300 70 800
M10
c
M12 84,3 27 800 33 700 35 400 42 200 43 800 50 600 67 400 75 900 87 700 103 000
c
M14 115 38 000 46 000 48 300 57 500 59 800 69 000 92 000 104 000 120 000 140 000
c
M16 157 51 800 62 800 65 900 78 500 81 600 94 000 125 000 141 000 163 000 192 000
M18 192 63 400 76 800 80 600 96 000 99 800 115 000 159 000 — 200 000 234 000
M20 245 80 800 98 000 103 000 122 000 127 000 147 000 203 000 — 255 000 299 000
M22 303 100 000 121 000 127 000 152 000 158 000 182 000 252 000 — 315 000 370 000
M24 353 116 000 141 000 148 000 176 000 184 000 212 000 293 000 — 367 000 431 000
M27 459 152 000 184 000 193 000 230 000 239 000 275 000 381 000 — 477 000 560 000
M30 561 185 000 224 000 236 000 280 000 292 000 337 000 466 000 — 583 000 684 000
M33 694 229 000 278 000 292 000 347 000 361 000 416 000 576 000 — 722 000 847 000
817 270 000 327 000 343 000 408 000 425 000 490 000 678 000 — 850 000 997 000
M36
M39 976 322 000 390 000 410 000 488 000 508 000 586 000 810 000 — 1 020 000 1 200 000
a
Where no thread pitch is indicated in a thread designation, coarse pitch is specified. This is given in ISO 261 and ISO 262.
b
To calculate A see 8.2.
s
c
For structural bolting 70 000 N, 95 500 N and 130 000 N, respectively.
9
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SIST EN ISO 898-1:2001
© ISO
ISO 898-1:1999(E)
Table 7 — Proof loads – ISO metric coarse pitch thread
a Nominal
Thread
stress
area
Property class
(d)
b
A
s, nom
2
mm
3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9
Proof load (A 3 S ), N
s, nom p
M3 5,03 910 1 130 1 560 1 410 1 910 2 210 2 920 3 270 4 180 4 880
M3,5 6,78 1 220 1 530 2 100 1 900 2 580 2 980 3 940 4 410 5 630 6 580
M4 8,78 1 580 1 980 2 720 2 460 3 340 3 860 5 100 5 710 7 290 8 520
M5 14,2 2 560 3 200 4 400 3 980 5 400 6 250 8 230 9 230 11 800 13 800
M6 20,1 3 620 4 520 6 230 5 630 7 640 8 840 11 600 13 100 16 700 19 500
M7 28,9 5 200 6 500 8 960 8 090 11 000 12 700 16 800 18 800 24 000 28 000
M8 36,6 6 590 8 240 11 400 10 200 13 900 16 100 21 200 23 800 30 400 35 500
M10 58 10 400 13 000 18 000 16 200 22 000 25 500 33 700 37 700 48 100 56 300
c
M12 84,3 15 200 19 000 26 100 23 600 32 000 37 100 48 900 54 800 70 000 81 800
c
M14 115 20 700 25 900 35 600 32 200 43 700 50 600 66 700 74 800 95 500 112 000
c
M16 157 28 300 35 300 48 700 44 000 59 700 69 100 91 000 102 000 130 000 152 000
M18 192 34 600 43 200 59 500 53 800 73 000 84 500 115 000 — 159 000 186 000
M20 245 44 100 55 100 76 00
...
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