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IS 13096 (2000) : Fasteners - Hexagon Nuts with Specified
Proof Load Values - Fine Pitch Thread - Mechanical
Properties [PGD 31: Bolts, Nuts and Fasteners Accessories]

Satyanarayan Gangaram Pitroda
Invent a New India Using Knowledge

Rhartrbari — Nitisatakam ^- ''"^

Bhartrhari — Nitisatakam
"Knowledge is such a treasure which cannot be stolen"

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PROTECTED BY COPYRIGHT

IS 13096 : 2000
ISO 898-6 : 1994

Indian Standard

FASTENERS — HEXAGON NUTS WITH SPECIFIED

PROOF LOAD VALUES — FINE PITCH THREAD —

MECHANICAL PROPERTIES

( First Revision )

ICS 21.060.10

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

J uly 2000 Price Group 5

Bolts, Nuts and Fasteners Accessories Sectional Committee, BP 33

NATIONAL FOREWORD

This Indian Standard ( First Revision ) which is identical with ISO 898-6 : 1994 'Mechanical properties
of fasteners — Part 6 : Nuts with specified proof load values — Fine pitch thread' issued by the
International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards
on the recommendation of the Bolts, Nuts and Fasteners Accessories Sectional Committee and approval
of the Basic and Production Engineering Division Council.

This standard was originally published in 1991 by adopting ISO 898-6 : 1988. This first revision has
been taken up consequent upon the revision of ISO 898-6 : 1988, to keep it in line with the latest
version.

In the adopted standard, certain terminology and conventions are not identical to those used in Indian
Standards. Attention is drawn especially to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be
read as 'Indian Standard'.

b) Comma (,) has been used as decimal marker while in Indian Standards the current practice is to

use a full point (.) as the decimal marker.

In the adopted standard, reference appears to certain International Standards for which Indian Standards
also exist. The corresponding Indian Standards which are to be substituted in their place are listed
below along with their degree of equivalence for the editions indicated:

International Standard
ISO 68: 1973')

ISO 261 :19732>

ISO 262 :1973='>

ISO 272: 1982
ISO 286-2: 1988

ISO 724: 1993

Corresponding Indian Standard

IS 4218 ( Part 1 )ISO General purpose
metric screw threads : Part 1 Basic profile
( second revision ) ( under preparation )

IS 4218 ( Part 2 )ISO General purpose
metric screw threads ; Part 2 General plan
( second revision ) ( under preparation )

IS 4218 ( Part 4 ) ISO General purpose
metric screw threads : Part 4 Selected sizes
of bolts, screws and nuts ( second revision )
( under preparation )

IS 9519 : 1980 Dimensions for width across
flats for hexagon head bolts and nuts

IS 919 ( Part 2 ): 1993 ISO System of limits :
Part 2 Table of standard tolerance grades
and limit deviation for hole and shaft
( first revision )

IS 4218 ( Part 3 ): 1999 ISO General
purpose metric screw threads : Part 3 Basic
dimensions ( second revision )

Degree of
Equivalence

Identical

Modified

Identical

'> Revised in 1998 in two parts. Part 1 is applicable and being adopted as second revision of IS 4218 ( Part 1)
*> Revised in 1998 and being adopted as second revision of IS 4218 ( Part 2 ).

'' Revised in 1998.

( Continued on third cover)

IS 13096 : 2000
ISO 898-6 : 1994

Indian Standard

FASTENERS — HEXAGON NUTS WITH SPECIFIED

PROOF LOAD VALUES — FINE PITCH THREAD —

MECHANICAL PROPERTIES

( First Revision )

1 Scope

This part of ISO 898 specifies the mechanical proper-
ties of nuts with specified proof load values when
tested at an ambient temperature range of -i- 10 °Cto
-I- 35 "C. Mechanical and physical properties will vary
with respect to temperature and property class.

Products conforming to the requirements of this part
of ISO 898 are evaluated only at the ambient tem-
perature range and may not retain the specified
physical properties at higher and lower temperatures.

At temperatures higher or lower than the ambient
temperature range, a significant change in properties
may occur. When fasteners are to be used above or
below the ambient temperature range, it is the re-
sponsibility of the user to ensure that the mechanical
and physical properties are suitable for his particular
service conditions.

This part of ISO 898 applies to nuts

— with nominal thread diameters, d, from 8 mm up
to and including 39 mm (fine pitch thread);

— of triangular ISO thread and with diameters and
pitches in accordance with ISO 68 and ISO 262
(fine pitch thread);

~ with diameter/pitch combinations in accordance
with ISO 261 (fine pitch thread);

— with thread tolerances 6H in accordance with
ISO 965-1 and 965-2 (see note 2);

— with specific mechanical requirements;

— with widths across flats as specified in ISO 272;

— with nominal heights greater than or equal to

— made of carbon steel or alloy steel (see note 1).

It does not apply to nuts requiring special properties
such as

— weldability;

— prevailing torque performance (see ISO 2320);

— corrosion resistance (see ISO 3506);

— ability to withstand temperatures above -i- 300 X
or below - 50 "C. (However, see note 1 .)

NOTES

1 Nuts made from free-cutting steel should not be used
above + 250 "C.

2 With thread tolerances other or larger than 6H, a de-
crease in the stripping strength should be considered (see
table 1).

In 150898:1988, the symbol D was used.

/S 13096 12000
ISO 898-6. 19 94

Table 1 — Reduction in thread strength

Nominal thread
diameter

Test load, %

Thread tolerances
6H 7H 6G

8<d=g 16

100

97,5

^6<d^39

100

98,5

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 lEC and ISO
maintain registers of currently valid International
Standards.

15068:1973, /SO genera/ purpose screw threads —
Basic profile.

150 261:1973, /SO genera/ purpose metric screw
threads — General plan.

ISO 262: 1973, /SO general purpose metric screw
threads — Selected sizes for screws, bolts and nuts.

150 272:1982, Fasteners - Hexagon products —
Widths across flats.

150 286-2:1988, /SO system of limits and fits —
Part 2: Tables of standard tolerance grades and limit
deviations for holes and shafts.

150 724:1993, /SO general-purpose metric screw
threads — Basic dimensions.

150898-2:1992, Mechanical properties of fasteners
— Part 2: Nuts with specified proof load values —
Coarse thread.

150965-1:1980, /SO general purpose metric screw
threads — Tolerances — Part 1: Principles and basic
data.

ISO 965-2:1980, /SO general purpose metric screw
threads — Tolerances — Part 2: Limits of sizes for
general purpose bolt and nut threads — Medium
quality.

1504964: 1984, Steel — Hardness conversions.

ISO 61 57-2: — 2', Fasteners — Surface discontinuities

— Part 2: Nuts with threads M5 to M39.

1506506:1981, Metallic materials — Hardness test

— Brinell test.

ISO 6507-/: 1982, Metallic materials — Hardness test

— Vickers test — Part 1: HV5 to HV 700.

ISO 6508: 1986, Metallic materials — Hardness test

— Rockwell test (scales A - B- C- D- E- F- G- H-
K).

3 Designation system

3.1 Nuts with nominal heights ^0,8d
(effective-lengths of thread ^ 0,6rf): Nuts of
style 1 and style 2

Nuts with nominal heights ^0,Bd (effective lengths
of thread >0,6d) are designated by a number to indi-
cate the maximum appropriate property class of bolts
with which they may be mated.

Failure of threaded fasteners due to over-tightening
can occur by bolt shank fracture or by stripping of the
threads of the nut and/or bolt. Shank fracture is sud-
den and therefore easily noticed. Stripping is gradual
and therefore difficult to detect and this introduces
the danger of partly failed fasteners being left in as-
semblies.

It would therefore be desirable to design threaded
connections so that their mode of failure would al-
ways be by shank fracture but, unfortunately, because
of the many variables which govern stripping strength
(nut and bolt material strengths, thread clearances,
across-flats dimensions, etc.), nuts would have to be
excessively thick to guarantee this mode in all cases,

A bolt or screw of thread diameter 8 mm to 39 mm
assembled with a nut of the appropriate property
class, in accordance with table2, is intended to pro-
vide an assembly capable of being tightened to the
bolt proof load without thread stripping occurring.

2) To be published.

18 13096:2000
ISO 8986 : 1994

Table 2 — Designation system for nuts witli nominai lieiglits ^0,8d

Property class of nut

Mating bolts

Nuts

style 1 style 2

Property class

Nominal thread
diameter range

Nominal thread diameter range

3.6; 4.6; 4.8

r1<- tQ

d< 39

—

5.6; 5.8

6.8

d^ 39

8.8

d^ 39

d^^6

10.9

d^ 39

d^16

d^39

12.9

rf<16

—

d^ 16

NOTE ~ In generai, nuts of a higher property class can replace nuts of a lower property class. This is advisable for a
bolt/nut assembly going into a stress higher than the yield stress or the stress under proof load of the bolt.

However, should tightening beyond bolt proof load
take place, the nut design is intended to ensure at
least 10 % of the over-tightened assemblies fail
through bolt breakage in order to warn the user that
the installation practice is not appropriate.

NOTE 3 For more detailed information on the strength
of screw thread assemblies and for the styles of nuts, see
150898-2:1992, annex A.

3.2 Nuts with nominal heights ^O.S^f and
<0,8d (effective heights of thread ^0,Ad and
<0,6d)

Nuts with nominal heights ^0,5<i and <0,8d (effec-
tive height of thread >0,4J and <0,6cO are desig-

nated by a combination of two numbers: the second
indicates the nominal stress under proof load on a
hardened test mandrel, while the first indicates that
the loadability of a bolt-nut assembly is reduced in
comparison with the loadability on a hardened test
mandrel and also in comparison with a bolt-nut as-
sembly described in 3.1. The effective loading ca-
pacity is not only determined by the hardness of the
nut and the effective height of thread but also by the
tensile strength of the bolt with which the nut is as-
sembled. Tables gives the designation system and
the stresses under proof load of the nuts. Proof loads
are shown in tableS. A guide for minimum expected
stripping strengths of the joints when these nuts are
assembled with bolts of various property classes is
shown in table?.

IS 13096 : 2000
ISO 898-6 : 1994

Table 3 — Designation system and stresses

under proof load for nuts with nominal heights

^0.5d and <0,Sd

Property class
of nut

Nominal stress

under proof

load

N/mm^

Actual stress

under proof

load

N/mm^

400

380

500

Nuts of property classes 05, 8 (style 1), 10 and 12
shall be hardened and tempered.

5 Mechanical properties

When tested by the methods described in clause 8,
the nuts shall have the mechanical properties set out
in tables.

4 Materials

Nuts shall be made of steel conforming to the
chemical composition limits specified in table4. The
chemical composition shall be analysed in accordance
with relevant International Standards.

Table 4 — Limits of chemical composition

Property class

Chem

(

max.

ical com
;hecl( an

min.

position
ilysis), »/

max.

limits

max.

5i»;6

—

0,50

—

0,060

0,150

8 2)

041)

0,58

0,25

0,060

0,150

10 2)

05 2)

0,58

0,30

0,048

0,058

12 2)

—

0,58

0,45

0,048

0,058

1) Nuts of this property class may be manufactured
from free-cutting steel unless otherwise agreed be-
tween the purchaser and the manufacturer. In such
cases, the following maximum sulfur, phosphorus and
lead contents are permissible:

sulfur 0,34 %; phosphorus 0,11%; lead 0,35%

2) Alloying elements may be added, if necessary, to
develop the mechanical properties of the nuts.

6 Proof load values

Proof load values are given in tables.

The nominal stress area, Ag, is calculated as follows:

A, = -

d2 + di

where

^'' is the basic pitch diameter of the external
thread;

d^ is the minor diameter of the external thread

where

rf^^Msthe basic minor diameter of the
external thread;

H is the height of the fundamental tri-
angle of the thread.

See ISO 724.

Nominal

thread

diameter

Property class
05

<ii

Stress under
proof load, Sp

N/mm2

Viclcers
hardness, HV

min. max.

Nut

State style

Stress under
proof load, S^

N/mm2

Vickers
hardness, HV

min. max.

Nut

state style

Stress under
proof load, 5p

N/mm2

Vickers
hardness, HV

min. max.

Nut

state style

B^d^ 16

380

188

302

NQT11

thin

500

272

353

QT2)

thin

690

175

302

NQTH

16<d^39

720

190

Nominal

thread

diameter

Property class

Stress under

proof load, 5p

N/mm*

Viclcer
ness

min.

3 hard-

, HV
max.

Nut
state style

Stress under

proof load, 5p

N/mm*

Vickers hard-
ness HV
min. max.

Nut
state style

Stress under
proof load, Sp

N/mm2

Vickers hard-
ness HV
min. max.

Nut
state style

8^d< 10

770

1 8 8

302

NQT1I3)

955

250

353

QT2>

890

195

302

■ NQTD

10<d<16

780

16<d^33

870

233

1 030

295

—

33 < d « 39

930

1090

Nominal

thread

diameter

Property class

Stress under

proof load, Sp

N/mm*

Viclcers
nbss
min.

> hard-

, HV
max.

Nu
state

t
style

Stress under

proof load, Sp

N/mm*

Vickers hard-
ness;, HV
min. max.

Nut
state style

Stress under

proof load, Sp

N/mm*

Vickers hard-
ness, HV

min. max.

Nut
state style

8$rf«i0

1100

295

353

QT2>

1 055

250

353

QT2>

1 200

295

353

QTZ>

10<d:$16

1 110

16<d€39

—

„

1 080

260

—

JOTE — Minimum liardness is mandatory only for heat-treated nuts and nuts too large to be proof-load tested. For all other nuts, minimum hardness is not
nandatorV but is provided for guidance only. For nuts which are not hardened and tempered, and which satisfy the proof-load test, minimum hardness shall
lot be cause for rejection.

1) NQT = Not quenched and tempered.

I) QT = Quenched and tempered.

5} Nuts with nominal thread diameters d>16 mm may be quenched a

nd tempered at th

e discretion of the manufacturer.

(0 0)

cr.

u o
(O o
(O o

Thread

Nominal
stress area
of mandrel

Property class
8

style 1

Proof load [A^ x

N
Style 1 style 1

Style 2

Style 1

Style 2

style 2

mm^

M8x 1

39,2

14 900

19 600

27 000

30 200

37 400

34 900

43 100

41 400

47 000

M10 X 1

64,5

24 500

32 200

44 500

49 700

61 600

57 400

71 000

68 000

77 400

M10 X 1^5

61,2

23 300

30 600

44 200

47 100

58 400

54 500

67 300

64 600

73 400

M12 X 1^5

92,1

35 000

46 000

63 500

71 800

88 000

82 000

102 200

97 200

110 500

Ml 2 X 1,5

88,1

33 500

44000

60 800

68 700

84100

78400

97 800

92 900

105700

MU X 1,5

125

47 500

62 500

86 300

97 500

119 400

111 200

138 800

131 900

150 000

Ml 6 X 1,5

167

63 500

83 500

115200

130 300

159 500

148 600

185 400

176 200

200400

Ml 6 X 1,5

215

81 700

107 500

154 800

187 000

221 50

—

232200

—

M18 X 2

204

77 500

102 000

146 900

177 500

210100

220300

M2 X 1^5

272

103400

136 000

195800

236600

280200

—

293800

—

M20x2

258

98 000

129 000

185 800

224 500

265 700

—

278600

—

M2 2 X 1,5

333

126 500

166 500

239 800

289 700

343000

—

359600

—

M22x2

318

120 800

159 000

229 000

276 700

327500

—

343400

—

M24x2

384

145900

192 000

276 500

334100

395500

— -

414 700

—

M2 7 x2

496

188 500

248 000

351 100

431 500

510900

—

535700

M30x 2

621

236 000

310 500

447 100

540 300

639600

—

670700

—

M33x 2

761

289 200

380 500

547 900

662 100

783800

—

821 90) —

M3$ X 3

865

328 700

432 500

622 800

804 400

942800

—

934200

M39x3

1 030

391 400

515 000

741 600

957 900

1123000

—

1112000

—

o
a.
<

IS 13096: 2000
ISO 898-6: 1994

7 Failure loads for nuts with nominal
heights of ^ 0,5d and < 0,8d

The values of failure loads given for guidance in
table 7 apply to different bolt classes. Bolt stripping is
the expected failure mode for lower strength bolts,
while nut stripping can be expected for bolts of higher
property classes.

Table 7 — Minimum stripping strength of nuts
as a percentage of the proof load of bolts

Property
class of
the nut

Minimum stripping strength of nuts as a
percentage of the proof load of bolts with
property classes

6.9 8,8 10.9 I 12.9

100

8 Test methods

8.1 Proof load test

The proof load test shall be used wherever the ca-
pacity of available testing equipment permits, and
shall be the referee method.

The nut shall be assembled on a hardened and
threaded test mandrel as shown in figures 1 and 2.
For referee purposes, the axial tensile test is decisive.

The proof load shall be applied against the nut in an
axial direction, and shall be held for 15 s. The nut shall
resist the load without failure by stripping or rupture,
and shall be removable by the fingers after the load
is released. If the thread of the mandrel is damaged
during the test, the test should be discarded. It may
be necessary to use a manual wrench to start the nut
in motion. Such wrenching is permissible provided
that it is restricted to one half turn and that the nut is
then removable by the fingers.

The hardness of the test mandrel shall be 45 HRC
minimum.

Mandrels used shall be threaded to tolerance class
5h6g except that the tolerance of the major diameter
shall be the last quarter of the 6g range on the mini-
mum material side.

M.= ^D11"'

*) D11istaken1romlS028^2.
Figure 1 — Axial tensile test

Load

Figure 2 — Axial compressive test

IS 13096 : 2000
ISO 698-6 : 1994

8.2 Hardness test

For routine inspection, hardness tests shall be carried
out on one bearing surface of the nut and the hard-
ness shall be taken as the mean of three values
spaced 120° apart. In case of dispute, the hardness
tests shall be carried out on a longitudinal section
through the nut axis and with impressions placed as
close as possible to the nominal major diameter of the
nut thread.

The Vickers hardness test is the referee test, and
where practicable a load of HV 30 shall be applied.

IfBrinell or Rockwell hardness tests are applied, the
conversion tables in accordance with ISO 4964 shall
be used.

The Vickers hardness test shall be carried out in ac-
cordance with the requirements of ISO 6507-1.

The Brinel! hardness test shall be carried out in ac-
cordance with the requirements of ISO 6506.

The Rockwell hardness test shall be carried out in
accordance with the requirements of ISO 6508.

f Mi I

Figure 3 — Examples Of marking with
designation symbol

Marking dot may be replaced
by manufacturer's mark hem

Figure 4 — Examples of marking with code
symbol (clock-face system)

8.3 Surface integrity test

For the surface integrity test, see ISO 6157-2.

9 Marking

9.1 Symbols

Marking symbols are shown in tables 8 and 9.

9.2 Identification

Hexagon nuts of all property classes shall be marked
in accordance with the designation system described
in clause 3, by indenting on the side or bearing sur-
face, or by embossing on the chamfer. See figures 3
and 4. Embossed marks shall not protrude beyond the
bearing surface of the nut.

9.3 Marking of left-hand thread

Nuts with left-hand thread shall be marked as shown
in figure5 on one bearing surface of the nut by in-
denting.

The alternative marking for left-hand thread shown in
figure6 may also be used.

Figure 5 — Left-hand thread marking

IS 13096 :2000
ISO 898-6 : 1994

Figure 6

•e.

1) f sr wMttt across flati.
Alternative left-hand thread marking

9.4 Alternative marking

Alternative or optional permitted marking as stated in
9.1 to 9.3, is left to the choice of the manufacturer.

9.5 Trade (identification) marking

The trade (identification) marking of the manufacturer
is mandatory on all products covered by the obligatory
marking requirements for property classes, provided
this is possible for technical reasons. Packages, how-
ever, shall be marked in all cases.

Table 8 — IVIarking for nuts with property classes in accordance with 3.1

Property class

12 1)

o»

a
E

either desig-
nation symbol

or code symbol
(clock-face sys
tern)

1) Indication of the 12 o'clock position with the manufacturer's mark is not possible.

Table 9 ^ Marking for nuts with property classes in
accordance with 3.2

Property class

Marking

-f^

( Continued from second cover )

International Standard

ISO 898-2: 1992

ISO 965-1 : 1980')

150 965-2:19802)

ISO 4964 : 1 984
ISO 61 57-2='i

ISO 6506: 1981
ISO 6507-1 :1982^)

ISO 6508: 1986

Corresponding Indian Standard

IS 1367 ( Part 6 ): 1994 Technical supply
conditions for tinreaded steel fasteners : Part 6
Mechanical properties and test methods for
nuts with specified proof loads ( third revision )

IS — ISO General purpose metric screw
threads — Tolerances : Part 1 Principles and
basic data ( under preparation )

IS — ISO General purpose metric screw
threads — Tolerances : Part 2 Limits of
sizes for general purpose external and internal
screw threads — Medium quality ( under
preparation )

IS 4258 : 1982 Hardness conversion for
metallic materials ( first revision )

IS 1367 ( Part 10 ): 1979 Technical supply
conditions for threaded steel fasteners :
Part 10 Surface discontinuities on nuts
( second revision )

IS 1500 : 1983 Method for Brinell hardness
test for metallic materials ( second revision )

IS 1501 ( Part 1 }: 1984 Method for Vickers
hardness test for metallic materials : Part 1
HV 5 to HV 1 00 ( second revision )

IS 1586 : 1988 Method for Rockwell hardness
test for metallic material ( Scales A-B-C-D-E-
F-G-H-K )( second revision )

Degree of
Equivalence

Identical

Modified
do

do
do

In reporting the results of a test or analysis made in accordance with this standard, if the final value,
observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 'Rules for
rounding off numerical values ( revised)'.

'' Revised in 1 9 9 8 ,
^ Revised in 1 9 9 8 ,
>> Publislied in 1995.
*' Revised in 1 9 9 7 .

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious
development of the activities of standardization, marking and quality certification of goods and attending to
coimected matters in the country.

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without
the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the
standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to
copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodieaHy; a standard along with amendments is reaffirmed'when-such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referringto the latest issue
6f 'BlS Handbook' and 'Standards ; Monthly Additions'.

This Indian Standard has been developed from Doc : No. BP 33 ( 0091 ) / LM 14 ( 0375 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

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Full text of "IS 13096: Fasteners - Hexagon Nuts with Specified Proof Load Values - Fine Pitch Thread - Mechanical Properties"

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