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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] 



A 



Satyanarayan Gangaram Pitroda 
Invent a New India Using Knowledge 





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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 



© BIS 2000 

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 



do 



do 



Modified 



Identical 



do 



'> 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 

d 

mm 


Test load, % 

Thread tolerances 
6H 7H 6G 


8<d=g 16 


100 


96 


97,5 


^6<d^39 


100 


98 


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 

mm 


Nominal thread diameter range 

mm 




5 


3.6; 4.6; 4.8 


r1<- tQ 


d< 39 


— 




5.6; 5.8 






6 


6.8 


d^ 39 


d^ 39 


_ 




8 


8.8 


d^ 39 


d^ 39 


d^^6 




10 


10.9 


d^ 39 


d^16 


d^39 




12 


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^ 


04 


400 


380 


05 


500 


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 

( 

C 

max. 


ical com 
;hecl( an 

Mn 

min. 


position 
ilysis), »/ 

P 

max. 


limits 

S 

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: 

2 



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 

d 

mm 


04 


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 


1 


16<d^39 


720 


190 




Nominal 

thread 

diameter 

d 

mm 


6 




Property class 


B 




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) 


1 


955 


250 


353 


QT2> 


1 


890 


195 


302 


■ NQTD 


2 


10<d<16 


780 


16<d^33 


870 


233 


1 030 


295 


— 


— 


— 


— 


33 < d « 39 


930 


1090 




Nominal 

thread 

diameter 

d 

mm 


10 




Property class 


12 


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 


1 055 


250 


353 


QT2> 


2 


1 200 


295 


353 


QTZ> 


2 


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. 










n 

S" 

09 



(0 0) 

o 



d> 



cr. 



u o 
(O o 
(O o 



0> 



Thread 


Nominal 
stress area 
of mandrel 


04 


05 


5 


6 


Property class 
8 


10 


12 






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. 
< 

0) 



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 



04 



05 



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 



85 



100 



65 



85 



45 



60 



40 



50 



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 



8 



IS 13096 :2000 
ISO 898-6 : 1994 



Figure 6 



A 

•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 



10 



12 1) 



o» 

c 

a 
E 

> 

c 



either desig- 
nation symbol 



10 



12 



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 


04 


05 


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 



do 



do 



Modified 
do 

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 
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BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without 
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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 



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