IS 919-2: ISO systems of limits and fits, Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts

49 Pages·1993·4 MB·English

by  Bureau of Indian Standards

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IS 919-2 (1993): ISO systems of limits and fits, Part 2:
Tables of standard tolerance grades and limit deviations
for holes and shafts [PGD 20: Engineering Standards]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

.,
IS 919 ( Part 2 ) : 1993
IS0 286-2 : 1988
mw
Indian Standard
0SI METSYS FO STIMIL AND STIF
PART 2 TABLES OF STANDARD TOLERANCE GRADES AND LIMIT
DEVIATIONS FOR HOLES AND SHAFTS
( First Revision
dnoceS tnirpeR JUNE 7991
UDC 621’753’1/‘2

@ SIB 1993
BUREAU OF INDIAN STANDARDS
KANAM ,NAVAHB 9 RUDAHAB HAHS RAFAZ GRAM
NEW IHLED 200011
January 1993 Price Group 13
Engineering Standards Sectional Committee, LM 01
CONTENTS
Page
0 introduction . . . . . . . . . 1
1 Scope . . . . . . . . . 1
2 Fi’eld of applicatibn . . . . . . . . . 1
3 References . . . . . . . . . 2
. . .
4 Standard tolerances . . . . . . 2
5 Limit deviations for holes . . . . . . . . . 2
6 Limit deviations for shafts . . . . . . . . . 2
7 Bibliography . . . . . . .*. 3
Notes on the presentation of Tables 2 to 32 . . . . . . 7
Tables 2 to 32 . . . . . . . . . 8 to 38
. . .
Annex - Graphical review of tolerance zones of holes and shafts 39
NATIONAL FOREWORD
This Indian Standard ( First Revision ) which is identical with IS0 286-2 : 1988 ‘IS0 system
of limits and fits - Part 2 : Tables of standard tolerance grades and limit deviations for holes
and shafts’, issued by ths International Organization for Standardization was adopted by the
Bureau of Indian Standards on the recommendations of the Engineering Standards Sectional
Committee ( LM 01 ) and approval of the Light Mechanical Engineering Division Council.
The standard was originally published in 1979 taking assistance from ISO/R 286- 1962
‘IS0 system cf limits and fits general, tolerances and deviations’. Present revision has been
taken up to hsrm3nize with IS0 286-2 : 1988. The deviation requirement of the most common
shafts and holes such as cd , CD, ef, FF, fg. FG for sizes up to 10 mm covered in the earlier
version have now been include d in IS 919 ( Part 1 ) : 1993 ‘IS0 system of limits 2nd fits :
Part 1 Bases of tolerances, deviations and fits ( secondrevision )’
This standard is a necessaxy adjunct to IS 919 ( Part 1 ) : 1993.
In the adcpted standard certain terminology and conventions are not identical with those used
in the Indian Standard, attention is especially dratin to the following:
a) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current
practice is to use point ( . ) as the decimal marker.
b) Wherever thr: words ‘International !%ndard’ appear, referring to this standard, they shall
be read as ‘Indian Standard’.
In the adopted standard reference appears to certain international standards fur which Indian
Standards also exist. The corresponding Indian Standards which are to be substituted in
their place are listed below along with their degree oi equivalence for the editions indicated:
International Corresponding Indian Standard Degree of
Standard Equivalence
IS0 286-l : 1988 IS 919 ( Part 1 ) : 1992 IS0 system of limits ldenticcl
and fits : Part 7 Bases of tolerances, devia-
tions and fits ( second revision )
IS0 1829 : 1985 IS 2709 : 1982 Guide for selection of fits Technically
( first revision ) equivalent
IS 919 ( Part 2) : 1993
IS0 288-2 : 1988
Jndian Standard
0SI METSYS FO STIMIL AND STIF
PART 2 TABLES OF STANDARD TOLERANCE GRADES AND LIMIT
DEVIATIONS FOR HOLES AND SHAFTS
( First Revision )
0 Introduction IS0 286 covers values for the upfier deviations ES (for holes)
and es (for shafts), and the lower deviations Et (for holes) and
The need for limits and fits for machined workpieces was ei (for shafts) (see figure 1).
brought about mainly by the inherent inaccuracy of manufac-
turing methods, coupled with the fact that “exactness” of size
NOTE - In the tables of limit deviations,t he values for the upper
was found to be unnecessary for most workpieces. In order
deviationE S or es are shown above the valuesf or the lower deviation
that function could be satisfied, it was found sufficient to
EI or ei except for tolerance class JS and js which is symmetrical about
manufacture a given workpiece so that its size lay within two
the zero line.
permissible limits, i.e. a tolerance, this being the variation in

size acceptable in manufacture.

Similarly, where a specific fit condition is required between
mating workpieces, it is necessary to ascribe an allowance,
either positive or negative, to the basic size to achieve the re- 2 Field of application
quired clearance or interference, i.e. a “deviation”.
The IS0 system of limits and fits provides a system of toler-
With developments in industry and international trade, it
ances and deviations suitable for plain workpieces.
became necessary to develop formal systems of limits and fits,
firstly at the industrial level, then at the national level and later
at the international level. It should be noted that the general term “hole” or “shaft” used
in this International Standard can be taken as referring to the
This International Standard therefore gives the internationally space contained by (or containing) the two parallel faces (or
accepted system of limits and fits.
tangent planes) of any workpiece, such as the width of a slot or
the thickness of a key (see also IS0 2861). Similarly, the term
A general graphical representation of the relationship between
“commonly used holes and shafts” shall be interpreted as pro-
the respective tolerance classes and their deviations is given in
viding a very wide choice of limit deviations suitable for a wide
the annex.
variety of requirements.
For further information on terminology, symbols, bases of the
1 Scope
system, etc., see IS0 286-l.
This part of IS0 286 gives values of the limit deviations for
commonly used tolerance classes (zones) for holes and shafts Notes on the presentation of tables 2 to 32 are given on
calculated from the information given in IS0 286-l. This part of p age 7.
1
SI
919( Part2): 1993
IS0 288-2 : 1988
a) Holes (internal features)
b) Shafts (external features)
Figure 1 - Upper and lower deviations

3 References Attention is drawn to the fact that the tolerance classes shown
in figures 2 and 3, and their limit deviations, given in tables 2
NOTE - See also clause 7. to 16, are not intended to give detailed directives on the selec-
tion of tolerance classes for any purpose. Recommendations
IS0 286-1, IS0 system of limits and fits - Part I: Bases of for the selection of tolerance classes are given in IS0 1929.
tolerances, deviations and fits.
NOTE - Some tolerance classes are only provided for a restricted
1
IS0 1829, Selection of tolerance zones for general purposes. range of basic size steps. For further information, see note on page 7.
4 Standard tolerances
6 Limit deviations for shafts
The values of standard tolerance grades IT1 to IT18 inclusive
are given in table 1. A synoptic representation of the tolerance classes for shafts,
given in this part of IS0 286, is shown in figures 4 and 5.
For information on the bases of the system and its application,
;
see IS0 286-l for values of standard tolerances IT0 and ITOI, Attention is drawn to the fact that the tolerance classes shown
see IS0 286-1, annex A, table 5. in figures 4 and 5, and their limit deviations, given in tables 17
to 32, are not intended to give detai,led directives on the selec-
tion of tolerance classes for any purpose. Recommendations
5 Limit deviations for holes for the selection of tolerance classes are given in IS0 1829.

A synoptic representation of the tolerance classes for holes, NOTE - Some tolerance classes are only provided for a restricted
given in this part of IS0 286, is shown in figures 2 and 3. range of basic size steps. For further information, see note 1 on page 7.
2
IS 919 (Part2): 1993
IS0 288-2 : 1988
7 Bibliography IS0 2WA Technical drawings - Geometrical tolerancing -
&lax&on3 material principle.
The following International Standards on tolerancing and
tolerance systems will be useful with regard to the application IST) 2766-1, General tolerances for d!mensions without
of this part of IS0 285: tolerance ind&ations - Part 1: Tolerances for linear and
angular dimensions. 2,
IS0 405, Technical drawihgs - Linear and angular toleranc-
ing - Ind-i cations on drawings; IS0 5155, Syste/n of cone fits for cones from C = 1 : 3 to
1 : ,005 lengths from 6 to 630 mm and diameters up to 500 mm.
IS0 1101, Technical drawings - Geometrical tolerancing -
Tolerancing of form, orientation, location and run-out -
IS0 8015, Technical drawings - Fundamental tolerancing
Generalities, #Wtions, symbols, indications on drawings.
principle.
ISOIR 1938, IS0 q&tern of limits and fits - Inspection of plain
workpieces. 1 1 IS0 8052, Castings - System of dimensional tolerances.

I) At present under revision.
2) At pressnta t the stage of draft. (Revision,i n part, of IS0 2768 : )%91
3
IS 919(Part2):1993
IS0 286-2:1988
Table 1 - Numerical values of standard tolerance grades IT for basic sizes up to 3 150 mm ‘)
ETON - sihT ,elbat nekat from 0SI .l-682 sah neeb included ni siht part fo 0SI 662 ot etatilicaf gnidnatsrednu dna esu fo eht .metsys
1) seulaV rof dradnats ecnarelot grades 10TI dna 0TI rof basic sezis ssel naht ro lauqe ot 005 mm era nevrg ni 0SI ,1-682 xenna ,A elbat .5

12 seulaV rof dradnats ecnarelot grades 1TI ot 5TI J.1cni( rof basic sezis revo 005 mm era included rof latnemirepxe esu
13 dradnatS ecnarelot grades 4171 ot 81TI lincl.) llahs ton be desu rof basic sezis ssel naht ro lauqe ot 1 mm.

4
IS 919 ( Part 2 ) : 1993
IS0 288-2 : 1988
Hl JSl
H2 JS2
EF3 F3 FG3 G3 H3 JS3 K3 M3 N3 3P R3 53
EF4 F4 FG4 G4 H4 JS4 K4 M4 N4 P4 R4 54
5E EF5 F5 FG5 G5 H5 JS5 K5 M5 N5 P5 R5 s5 T5 u5 V3 x5
6cc cl6 6E EF6 F6 FG6 G6 H6 JS6 J6 K6 M6 N6 P6 R6 S6 T6 U6 V6 X6 Y6 26 ZA6
CD7 07 E7 EF7 n FG7 G7 H7 JS7 J7 K7 M7 N7 P7 R7 s7 17 u7 V7X7 Y-7 Z7 ZA7 207 zC7
BCEB CD8 D8 E8 EF8 FE FG8 G9 HE JS9 J8 K8 ME NE P8 R8 SE T8 U8 V-8 X8 YE Z8ZA8 288 zC8
CD9 D9 E9 EF9 F9 FG9 G9 H9 JS9 K9 M9 N9 P9 R9 s9 u9 x9 Y9 Z9 ZA9 z09 zC9
A10 BlO Cl0 CD10 DlO El0 EFlO FlO FGlO GlO HlO JSlO KlO Ml0 NlO PlO RlO SlO UlO x10 YlO ZlO ZAlO ZBlO ZClO
Dll Hll JSll Nil Zll ZAll ZBll ZCll
Al2 812 Cl2 D12 H12 JS12
D13 H13 JS13
H14 JS14
H15 JS15
H16 JS16
Ii17 JS17
H18 JS18
3 4 5 -ii- 7 8 9 10 ii 13 14 15 18
Tables
Figure 2 - Synoptic representation of tolerance classes for holes for basic sizes less than or equal to 500 mm
Hl JSl
H2 JS2
H3 JS3
H4 JS4
H5 JS5
6E6D 6F G6 H6 JS6 K6 M6 N6 m R6 S6 T6 U6
D7 E7 n G7 H7 JS7 K7 M7 N7 7P R7 s7 r;r u7
D8E8 FE G8 HE JS8 Kfi ME NE 8P R8 SE T8 U8
WE9 F9 H9 JS9 N9 9P
DlO El0 HlO JSlO
Dll Hll JSll
D12 H12 JS12
D13 H13 JS13
H14 JS14

H15 JS15

H16 JS16
H17 JS17
H18 JS18
-iiT
3 4 5 6 7 I 8 9 11 12 13
Tables
NOTE - The tolerance classes in the frame are given for experimental use.
Figure 3 - Synoptic representation of tolerance classes for holes for basic sizes
greater than 500 mm and less than or equal to 3 150 mm

5