,. IS 919 ( Part 2 ) : 1993 IS0 286-2 : 1988 mw Indian Standard IS0 SYSTEM OF LIMITS AND FITS PART 2 TABLES OF STANDARD TOLERANCE GRADES AND LIMIT DEVIATIONS FOR HOLES AND SHAFTS ( First Revision Second Reprint JUNE 1997 UDC 621’753’1/‘2 @ BIS 1993 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 January 1993 Price Group 13
IS 919 Sysytem of Limits & Fits Helps in deciding Limits of dimensions & resulting fits fo machine parts.
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,.
IS 919 ( Part 2 ) : 1993 IS0 286-2 : 1988
mw
Indian Standard
IS0 SYSTEM OF LIMITS AND FITS
PART 2 TABLES OF STANDARD TOLERANCE GRADES AND LIMIT DEVIATIONS FOR HOLES AND SHAFTS
( First Revision
Second Reprint JUNE 1997
UDC 621’753’1/‘2
@ BIS 1993
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
January 1993 Price Group 13
Engineering Standards Sectional Committee, LM 01
CONTENTS
Page
1
1
1
2
2
2
2
3
7
8 to 38
39
0 introduction . . . . . .
1 Scope . . . . . .
2 Fi’eld of applicatibn . . . . . .
3 References . . . . . .
4 Standard tolerances . . . . . .
5 Limit deviations for holes . . . . . .
6 Limit deviations for shafts . . . . . .
7 Bibliography . . . . . .
Notes on the presentation of Tables 2 to 32 . . .
Tables 2 to 32 . . . . . .
Annex - Graphical review of tolerance zones of holes and shafts
. . .
. . .
. . .
. . .
. . .
. . .
. . .
.*.
. . .
. . .
. . .
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 included 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 Standard
IS0 286-l : 1988
IS0 1829 : 1985
Corresponding Indian Standard
IS 919 ( Part 1 ) : 1992 IS0 system of limits and fits : Part 7 Bases of tolerances, devia- tions and fits ( second revision )
IS 2709 : 1982 Guide for selection of fits ( first revision )
Degree of Equivalence
ldenticcl
Technically equivalent
IS 919 ( Part 2) : 1993 IS0 288-2 : 1988
Jndian Standard
IS0 SYSTEM OF LIMITS AND FITS
PART 2 TABLES OF STANDARD TOLERANCE GRADES AND LIMIT DEVIATIONS FOR HOLES AND SHAFTS
( First Revision )
0 Introduction
The need for limits and fits for machined workpieces was brought about mainly by the inherent inaccuracy of manufac- turing methods, coupled with the fact that “exactness” of size was found to be unnecessary for most workpieces. In order that function could be satisfied, it was found sufficient to manufacture a given workpiece so that its size lay within two 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- quired clearance or interference, i.e. a “deviation”.
With developments in industry and international trade, it 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.
This International Standard therefore gives the internationally accepted system of limits and fits.
A general graphical representation of the relationship between the respective tolerance classes and their deviations is given in the annex.
1 Scope
This part of IS0 286 gives values of the limit deviations for commonly used tolerance classes (zones) for holes and shafts calculated from the information given in IS0 286-l. This part of
IS0 286 covers values for the upfier deviations ES (for holes) and es (for shafts), and the lower deviations Et (for holes) and ei (for shafts) (see figure 1).
NOTE - In the tables of limit deviations, the values for the upper deviation ES or es are shown above the values for the lower deviation EI or ei except for tolerance class JS and js which is symmetrical about the zero line.
2 Field of application
The IS0 system of limits and fits provides a system of toler- ances and deviations suitable for plain workpieces.
It should be noted that the general term “hole” or “shaft” used in this International Standard can be taken as referring to the space contained by (or containing) the two parallel faces (or 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 “commonly used holes and shafts” shall be interpreted as pro- viding a very wide choice of limit deviations suitable for a wide variety of requirements.
For further information on terminology, symbols, bases of the system, etc., see IS0 286-l.
Notes on the presentation of tables 2 to 32 are given on page 7.
1
IS 919( Part2): 1993 IS0 288-2 : 1988
a) Holes (internal features)
b) Shafts (external features)
Figure 1 - Upper and lower deviations
3 References
NOTE - See also clause 7.
IS0 286-1, IS0 system of limits and fits - Part I: Bases of
tolerances, deviations and fits.
IS0 1829, Selection of tolerance zones for general purposes.
Attention is drawn to the fact that the tolerance classes shown in figures 2 and 3, and their limit deviations, given in tables 2
to 16, are not intended to give detailed directives on the selec-
tion of tolerance classes for any purpose. Recommendations for the selection of tolerance classes are given in IS0 1929.
NOTE - Some tolerance classes are only provided for a restricted range of basic size steps. For further information, see note 1 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.
For information on the bases of the system and its application,
see IS0 286-l ; for values of standard tolerances IT0 and ITOI,
see IS0 286-1, annex A, table 5.
5 Limit deviations for holes
A synoptic representation of the tolerance classes for holes, given in this part of IS0 286, is shown in figures 2 and 3.
A synoptic representation of the tolerance classes for shafts,
given in this part of IS0 286, is shown in figures 4 and 5.
Attention is drawn to the fact that the tolerance classes shown
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 for the selection of tolerance classes are given in IS0 1829.
NOTE - Some tolerance classes are only provided for a restricted 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
The following International Standards on tolerancing and tolerance systems will be useful with regard to the application of this part of IS0 285:
IS0 405, Technical drawihgs - Linear and angular toleranc- ing - Indications on drawings; -
IS0 1101, Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - Generalities, #Wtions, symbols, indications on drawings.
IST) 2766-1, General tolerances for d!mensions without tolerance ind&ations - Part 1: Tolerances for linear and angular dimensions. 2,
IS0 5155, Syste/n of cone fits for cones from C = 1 : 3 to 1 : 500, lengths from 6 to 630 mm and diameters up to 500 mm.
IS0 8015, Technical drawings - Fundamental tolerancing 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 pressnt at the stage of draft. (Revision, in part, of IS0 2768 : 19%)
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 ‘)
NOTE - This table, taken from IS0 286-l. has been included in this part of IS0 266 to facilitate understanding and use of the system.
1) Values for standard tolerance grades IT01 and IT0 for basic sizes less than or equal to 500 mm are grven in IS0 286-1, annex A, table 5.
21 Values for standard tolerance grades IT1 to IT5 (inc1.J for basic sizes over 500 mm are included for experimental use
31 Standard tolerance grades 1714 to IT18 lincl.) shall not be used for basic sizes less than or equal to 1 mm.
4
IS 919 ( Part 2 ) : 1993 IS0 288-2 : 1988
Hl
H2
H3
H4
H5
H6
H7
HE
H9
HlO
Hll
H12
H13
H14
H15
H16
Ii17
H18
-ii-
JSl
JS2
JS3
JS4
JS5
JS6
JS7
JS9
JS9
JSlO
JSll
JS12
JS13
JS14
JS15
JS16
JS17
JS18
7
FG3 G3 FG4 G4
FG5 G5
FG6 G6
FG7 G7
FG8 G9
FG9 G9
FGlO GlO
EF3 F3
EF4 F4
EF5 F5
EF6 F6
EF7 n
EF8 FE
EF9 F9 EFlO FlO
K3
K4
K5
J6 K6
J7 K7
J8 K8
K9
KlO
M3 N3
M4 N4
M5 N5
M6 N6
M7 N7
ME NE
M9 N9
Ml0 NlO
Nil
P3 P4
P5
P6
P7
P8
P9
PlO
10
R3 53 R4 54
R5 s5
R6 S6 R7 s7
R8 SE R9 s9
RlO SlO
ii
E5
cc6 cl6 E6
CD7 07 E7
CD8 D8 E8
CD9 D9 E9
CD10 DlO El0
Dll
D12
D13
T5 u5
T6 U6
17 u7
T8 U8
u9
UlO
V3 x5
V6 X6 Y6
V7X7 Y-7
V-8 X8 YE
x9 Y9
x10 YlO
26 ZA6
Z7 ZA7
Z8ZA8
Z9 ZA9
ZlO ZAlO
Zll ZAll
207 zC7
288 zC8
z09 zC9
ZBlO ZClO
ZBll ZCll
BECB
A10 BlO Cl0
Al2 812 Cl2
3 4 5 8 9 13 14 15 18
Tables
Figure 2 - Synoptic representation of tolerance classes for holes for basic sizes less than or equal to 500 mm
D6E6 F6 G6 K6
D7 E7 n G7 K7
D8E8 FE G8 Kfi WE9 F9
DlO El0
Dll
D12
D13
Hl
H2
H3
H4
H5
H6
H7
HE
H9
HlO
Hll
H12
H13
H14 H15
H16
H17
H18
JSl
JS2
JS3
JS4
JS5
JS6 JS7
JS8
JS9
JSlO
JSll
JS12
JS13
JS14
JS15
JS16
JS17
JS18
M6 N6
M7 N7
ME NE
N9
R6
R7
R8
m P7
P8
P9
Tii-
S6
s7
SE
T6 U6
r;r u7
T8 U8
3 4 5 6 7 I 8 9 11 12
Tables
13
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
IS 919 (Part i) : 1993 IS0 2862 : 1988
hl
h2
h3
h4
h5
h6
h7
h8
h9 h10
hll
h12
h13 h14
h15
h16
h17 h18
21
jS1
id ia id id 16 js7
ia8
ia jsl0
jsll
js12
js13 js14
js15
js16 $17
js18
23
ef3 ef4
a5 ef5
a6 ef6
e7 ef7
aa em
a9 ef9
e10 efl0
f3 k-9 f4 fg4
f5 fg5
f6 fss tJ fg7
f8 f98
f9 f99 f10 fgl0
k3
k4
j5 k5
j6 k6
j7 k7
j8 k8
k9
k10
kll k12
k13
m3n3
m4n4
m5 n5
m6n6 m7 n7
man8
m9 n9
p3 p4 P5
p6
P7 P8
P9
PI0
r3 r4
r5
r6 r7
r8
r9 r10
27
s3
s4
s5
s6 s7
s3
s9
SlO
28
cd5 d5
cd6 d6 cd7 d7
cd8 d8
cd9 d9
cdl0 d10
dll
d12 d13
t5 u5
t6 u6 t7 u7
t8 u8
u9
v5 x5
fix6fl v7 x7 y7
v8x8 y8
fivs x10 y10
26 ra6
27 za7
z8 za8
29 zag
210 zal0
211 zall
zb7 zc7
zb8 zca
zb9 zc9 zbl0 ~10
zbll zcll
CB
a9 b9 c3 a10 b10 cl0
all bll cl1
al2 b12 cl2
a13.bl3
t 17 18 19 m 21 24 25 26 29 30 31
Tables
Figure 4 - Synoptic representation of tolerance classes for shafts for basic sizes less than or equal to 500 mm
hl
h2
h3
h4
h5
h6
h7
h8
h9
h10
hll
h12
jsl
IQ
13
Iti
iss_l
1~6
$7
is6
is9 JSlO jsll
js12
JS13
js14
js15 $16
$17
1~18
e6
e7
a8 e9
e10
ffi t-7
f8
f9
k6
k7
ka
k9
kl0
kll
k12
k13
ps P7
Pa
26
r6
r7
ra
27
s6
s7
58
28
t6 u6
t7 u7
u8
29‘
m6 n6
m7 n7
25 i 20 23 1 24
Tables
NOTE -- The tolerance classes in the frame are given for experimental use.
Figure 5 - Synoptic representation of tolerance classes for shafts for basic sizes
greater than 500 mm and less than or equal to 3 150 mm
6
IS 919 (Part2) :.1993 iSO 286-2 : 1988
Notes on the presentation of tables 2 to 32
1 Values may be calculated, from the bases given in IS0 286-l. for fundamental deviations used for tolerance classes, for which there is no entry in the tables, but for which the space has been left blank.
2 A small horizontal separation has been inserted in the tables, where appropriate, to distinguish between values for
basic sizes less than or equal to 5Ofl mm and those greater than 500 mm, which have been derived from different bases.
1) The intermediate fundamental deviation CD is provided primarily for fine mechanisms and horology. If tolerance classes involving this fundamental deviation in other basic sizes are required, they may be calculated in accordance with IS0 286-l.
9
IS 919 (Part2) : 1993 Iso 288-2 : 1988
Tabls 4 - Limit deviations for holes EF and F
Upper limit deviation = ES Lower limit deviation = EI
Deviations in micrometres
Basic size I
mm I I
up to Above and in- 3 4 5 5 7 8 8 10 3 4 5 8 7 8 9 10
1) The intermediate fundamental deviation FG is provided primarily for fine mechanisms and horology. If tolerance classes involving this fundamen- tal deviation in other basic sizes are required, they may be calculated in accordance with IS0 296-l.
11
IS 919 ( Part 2 ) : 1993 IS0 288-2 : 1988
Table 6 - Limit deviations for holes H
Upper limit deviation = ES Lower limit deviation = EI
1) Tolerance grades IT14 to IT18 hncl.) shall not be used for basic sizes less-than or equal to 1 mm.
2)
2) The values given in the frame, for tolerance grades IT1 to IT5 fincl.). for basic sizes greater than 500 mm and less than or equal to 3 150 mm, are included for experimental use.
Table 7 - Limit deviations” for holes JS
Upper limit deviation = ES Lower litif deviation = EI
1) In order to avoid repetition of equal values, the table lists the values as ” kx”; this is to be interpreted as ES 2. +Y and El = --x, e.g. Tip2 Pm.
2) Tolerance grades IT14 to IT15 fincl.) shall not be used for basic sizes less than or equal to 1 mm.
3) The values in the frame, for tolerance grades IT1 to IT5 tincl.), for basic sizes greater than 500 mm and less than or equal to 3 150 mm, are included for experimental use. \
IS 919 ( Part 2) : 1993
IS0 288-2 : 1988
Table 8 - Limit deviations for holes J and K
Upper limit deviation = ES Lower limit deviation = El
Deviations in micrometres
Basic size J K
mm
up to Above and in- 6 7 8 9’) 3 4 5 6 7 8 92) 102)
eluding
3 +2 +4 +6 0 0 0 0 0 -
0 0 0
-4 -6 -8 -2 -3 -4 - 6 10 - 14 ~25 -40
3 6 +5 + 63' +10 0 +0,5 0 + 2 + 3 + 5
-3 -8 -2.5 -3.5 -5 - 6 - 9 - 13
6 10 1; 18 +12 0 +0,5 +l + 2 + 5 + 6
-7 -10 -2.5 -3.5 -5 - 7 10 - 16
10 18 ‘; + 10 +15 0 +1 +2 + 2 + 6 + 8
-8 -12 -3 -4 -6 - 9 12 - 19 _
18 30 +; + 12 +20 -0.5 0 +1 + 2 + 6 + 10
-9 -13 -4,5 -6 -8 - 11 - 15 - 23
30 5o + 10 +14 +24 -0.5 +1 +2 + 3 i 7 + 12
-6 -11 -15 -4.5 -6 -9 - 13 18 27
50 80 + 13 +18 +28 c3 + 4 + 9 + 14
._ 6 -12 -18 -10 15 21 - 32 ~.-.-_..~~~__._
80 12’ + 16 C22 +34 +2 + 4 + 10 + 16
-6 -13 -20 -. 13 1e _____.
12rj 180 + 18 +26 +41 +3 + 4
-7 -14 -22 -15 - 21
180 250 +2z +30 +47 +2 + 5
-7 -16 -25 -18 - 24
250 +25
3'5 _ 7 +36 +55 +3 + 5'
-16 -26 -20 27
400 y c39 +60 +3 + 7 -18 -29 -22. - 29
+33
5oo -J
+43 +66 +2 + 8
-20 -31 -25 - 32
500 630 0 0 0 -44 - JO 110
630 800 0 0 0
-50 -60 - 125
800 1000 0 0 0
-56 -%I -140 ___
1000 1250 0 0 0
-66 -105 -165 _____________
1 250 1600 0 0 0
- 76 -125 -195
1600 2oocl 0 0 0
- 92 -150 -230
2000 2500 0 0 0
-110 -175 -280
2 500 3 150 0 0 0 -- 135 -210 -330
1) Tolerance classes J9, JlO, etc. are symmetrical about the zero line. For these values, see JS9, JSlO, etc.
2) Deviations for K in tolerance grades above IT8 are not defined for basic sizes greater than 3 mm
3) Identical with JS7.
14
IS 919 ( Part 2) : 1993 IS0 286-2 : 1988
Table 9 - Limit deviations for holes M and N
Upper limit deviation = ES Lower limit deviation = EI
Upper limit deviation = ES Lower limit deviation = EZ
Deviations in micrometres
Basic siFe
mm
-
17
IS 919 ( Part 2) : 1993 ' IS0 288-2:1988
Table 12 - Limit deviations for holes S
Upper limit deviation = ES
Lower limit deviation = EI
Basic size
up to Above and in.
cludin(
500 560
560 630
630 710
710 800
800 900
900 1000
1000 1 120
1 120 1250
1 250 1 400
1400 1600
1600 1800
1800 2000
2000 2240
2240 2500
2500 2800
2800 3 150
Deviations in micrometres
IS 919 ( Part 2) : 1993 IS0 286-2 : 1988
Table 13 - Limit deviations for holes T and U
Upper limit deviation = ES Lower limit deviation = EZ
Basic size
_ 3
40 50
50 65
65 80
80 100
100 120
120 140
140 160
160 180
180 200
200 225
225 250
250 280
280 315
315 355
355 400
400 460
460 500
l-
a
-
-
5
-
-3 8
-4 7
-4 4
-5 5
-5 0
-6 1
-
-
-
-
-
/ I /
- 691- 6+ 751 I - 961 - 911-1021 -1021 -102
-241 -250 -299 -338 -347 -396 -445 -525
Basic size
mm I
Above
500
560
630
710
800
900
1 000
1 120
1250
1400
1600
1800
2000
2 240
2500
2800
,
up to and in- 6 eluding
660 I z
630 1 z
710 I g
800 I z
900 - 620
- 676
lo00 1%
1 120 780
-846
1 250 I z
1400 - 9E0 -1038
1600 -1050
-1128
1800 -1200
-1 292
2000 -1350
-1442
2 240 -1500
-1 610
2 500 -1650
-1760
2800 -1908
-2035
3 150 -2100
-2235
Deviatioils in micrometres
1
- 780 - 780
- 88- 945
-1200 ~-1200
-1350 -1430
-1350 -1350
-1600 -1580
-1500 -1500
-1675 -1780
I
-1650 -1650
-1825 -1930
-1900 -1900
-2110 -2230
-2100 -2100
-2310 -2430
l-6Lx-m-8al - 644 - 670 - 710
-660-660-660
- 704 - 730 - no
- 740 - 740 - 740
-790 -820 -865
-840-840-840
- 690 - 920 - 965
-940-940-940
996 -1030 -1080
-1Ow -1050 -1050
-1106 -1140 -1190
-1150 -1150 A1150
-1216 -1255 -1315
-1300 -1300 -13cHl
-1366 -1405 -1466
-1450 -1450 -1450
-1 528 -1575 -1645
-1600 -1600 -1600 -1 678 -1 725 -1 795
-1850 -1850 -1850
-1942 -2coO -2Om
-2m -2Ocn -2Ocn
-2092 -2150 -2230
-2300 -2300 -2300
-2410 -2475 -2580
-2500 -2500 -2500
-2610 -2675 -2780
-2900 ~2900,-29Kl
-3035 -3110 -3230
-3200 -3200 -3200
-3335 -3410 -3530
1) Tolerance dasses T5 to T8 (incl.) have not been tabulated for basic sizes less than or equal to 24 mm. It is recommended that tolerance classes U5 to U8
(incl.1 be used instead. However, if tolerance classes T5 to T8 (incl.1 are especially required, they may be calculated from the bases given in IS0 286-l.
19
IS 919 ( Part 2) : 1993
IS0 288-2 : 1988
up to Above and in- 5 6 7 8
eluding
- 3
3 6
6 10
IO 14
14 ‘8 1; 1: -32 -39 _CJJ -66
Table 14 - Limit deviations for holes V, X and Y 11
Upper limit deviation = ES Lower limit deviation = El
Basic size
mm V2)
Deviations in micrometres
Y3)
-498 -507 -556 -605
-516 -505 -525 -525
-546 -557 -606 -655
315 355 -464 -454 -475 -579 -569 -590 -590
-500 -511 -564 -615 -626 -679 -730
400 450 -582 - 572 -595 -727 -717 -740 -740
-622 -635 -692 -767 -760 -637 -635
6 7 a 9 10
I / I I
T-t--Tit- / _ 59 55 - - 63 -63 -63
_ 72 76 - 96 -115 -147
_ 71 67 - - 75 - 75 - 75
_ m-88 - 108 -127 -159
_ 89 85 - - 91 -94 -94
105 110 - - 133 -1% -194
- 109 105 - - 114 -114 -114
- 125 130 - - 153 -176 -214
- 138 133 - - 144
- 157 163 - - 190
166 163 - - 174
- 187 193 - - 220
- 207 201 - 214
- 229 236 - 269
- 247 241 ( - 254 1 I
- 719 -709 -730
- 755 - 766 - 819
-809 - 799 - 820
-845 -856 -909
- 907 - 697 - 920
-941 -960 -1 017
~~_ ~~ 1) Fundamental deviations V, X and Y are not provided for basic sizes greater than 500 mm.
2) Tolerance classes V5 to V8 (incl.) have not been tabulated for basic sizes less than or equal to 14 mm. It is recommended that tolerance classes X5
to X8 fincl.) be used instead. However, if tolerance classes V5 to V8 fincl.) are especially required, they may be calculated from the bases given in
IS0 286-l.
3) Tolerance classes Y6 to YlO (incl.) have not been tabulated for basic sizes less than or equal to 18 mm. It is recommended that to!erance classes
26 to 210 (incl.) be used instead. However, if tolerance classes Y6 to YlO (incl.) are especially required, they may be calculated from the bases given in
IS0 286-l.
20
IS 919 ( Part 2) : 1993 IS0 286-2 : 1988
Table 15 - Limit deviations for holes 2 and ZA l1
Upper limit deviation = ES Lpwer limit deviation = EZ
11 The intermediate fundamental deviation cd is provided primarily for fine mechanisms and horology. If tolerance classes involving this fundamental deviation in other basic sizes are required, they may be calculated in accordance with IS0 286-l.
1) The intermediate fundamental deviation ef is provided primarily for fine mechanisms and horology. If tolerance classes involving this fundamcntcl deviation in other basic sizes are required, they may be calculated in accordance with IS0 286-l.
25
IS 919 ( Part 2 ) : 1993 IS0 286-2 : 1988
Table 20 - Limit deviations for shafts f and fg
Upper limit deviation = es Lower limit deviation = ei
Deviations in micromstres
I Basic size
I f
I fgll
mm
up to Above and in- 3 4 5 6 7 6 9 10 3 4 5 6 7 6 9 10
I) The intermediate fundamental deviation fg is provided primarily for fine mechanisms and horology. If tolerance classes involving this fundament, deviation in other basic sizes are required, they may be calculated in accordance with IS0 286-l.
1 J Tolerance grades IT14 to IT16 fincl.) shall not be used for basic sizes less than or equal to 1 mm.
2J The values given in tha frame, for tolerance grades IT1 to IT6 finc1.J. for basic sizes greater than 500 mm and lass than or equal to 3 160 mm, are included for experimental use.
28
IS 919 ( Part 2 ) : 10~3
IS0 286-2 : 1988
Table 24 - Limit deviations for shafts j and k
Upper limit deviation = es
Lower limit deviation = ei
Deviations in micrometres
Basic size i k
mm
up to 4bove and in- 5’) 6’) 7’) 8 3 4 5 6 7 6 9 10 11 12 13
1) Tolerance classes t5 to t8 fincl.) have not been tabulated for basic sizes less than or equal to 24 mm. It is recommended that tolerance classes u5 to ~8 (incl.1 be used instead. However, if tolerance classes t5 to t8 fincl.1 are especially required, they may be calculated from the bases given in IS0 286-l
IS 919 (Part2): 1993 IS0 288-2 : 1988
Table 30 - Limit deviations for shafts v. x and y l)
+246 +253 +288 +291 140 160 +228 +228 +228 +228
160 180 +270 t277 +292 +315 +252 +252 +252 +252
180 200 +304 +313 +330 +356 +284 +284 +284 +284
+356 +382
530 +530 +530
635 +658 +692 =l=c 595 +s +6.x
700 +723 +757 450 I 500 I ZEI I L6cl I +&I I +&o
1 X
Upper limit deviation = es Lower limit deviation = ei
Deviations in micrometrea
I I I I I I I
5 1 5 1 7 1 9 1 10 1 6 7
+54 +54 +54 +54 +54 t -54 + ii +731t77/t851t97ttll6/+1481+ 881+ 96 -t&l t&l t64 +&I t64 t 64 + 75 t 75 t91 t96 +105 +119 +142 t 180 + 110 t 119 t80 +@I +80 +80 t80 t 80 +94 +94
t108 +113 tl22 +136 +159 + 197 + 130 + 139 t 97 t 97 + 97 t 97 t97 t 97 t 114 t 114
t135 +141 t152 +16a t196 t 242 t 163 +122 t122 t122 t122 +122 t 122 + 144
+159 +165 t176 t192 t220 + 266 t 193 tl46 +i46 +146 t146 Cl46 t 146 + 174
+193 t200 +213 t232 +265 t 318 + 236 +179 +178 +178 t178 t178 + 178 t 214
1) Fundamental deviations v, x and y are not provided for basic sizes greater than 500 mm.
21 Tolerance classes v5 to v8 (incl.) have not been tabulated for basic sizes less than or equal to 14 mm. It is recommended that tolerance classes x5
to x8 5ncl.l be used instead. However, if tolerance classes v5 to v8 (incl.1 are especially required, they may be calculated from the bases giver? in
ED 286-l.
3) Tolerance classes y5 to ~10 (incl. 1 have not been tabulated for basic sizes less than or equal to 18 mm. It is recommended that tolerance classes z6
to 210 tincl.) be used instead. However, if tolerance classes y6 to ~10 (incl.1 are especially required, they may be calculated from the bases given in IS0 2%&l.
IS 919(Patt2):1993 IS0 2862 : 1988
Basic size
mm
Table 31 - Limit deviations for shafts z and za ‘1
Upper limit deviation = es Lower limit deviation = ei
Deviations in micromerres
2
_
11 6
+ 86 + 38 + 26 + 32
TllO + 50
t 35 + 42 -
+ 132 + 61
t 42 + 52
+160 + 75
+50 +64
+170 + 88
t60 + 77
+ 203 + 111
+ 73 + 98
+ 218 + 13;
+88 + 118
t n2 + 164
+ 112 t 146
+296 + 196
+ 136 + 160
+ 362 + 245
+ 172 + 226 -
+4OO + 233
+ 210 + 274 _
+ 478 + 367
+ 256 + 335 .___
+ 530 + 422
+ 310 + 400
+ 615 + 495
+ 365 + 470 _-
+665 +560
+ 415 + 535 -
+ 715 + 625
+465 +6cKl
+810 +EB
+ 520 + 670 __--__
+ 865 + 769
t 575 + 740
,+ 930 + 649
+640 + 620 -_
+1 030 + 952
+ 710 + 920 ~
+1 110 +l 032
+ 790 +1m
+1260 +1186
+900 +1150
+1360 +1336
+lOOO +1300
+1500 +1490
+1llm +1450
+1650 +1640
+1250 +1600
7 8 9 10 11
+ 42
+ 32 .-__
+ 54
+ 42
+ 67
+ 52 ~-
+62
+ 64 ____
+ 95
t n -__ + 119
+ 96
+ 139
+ 118
+ 173
+ 146
+205
+ 180
+ 256
c226 -__
+304
+ 274 -___
+ 370
+ 335
_._-
+ 435
+4C0
+ 510
+ 47G
+ 575
+ 535 -__
+fdO
+600 -___
+ 716
+ 670
+ 786
t 740 ____
+666
+ 620
+ 972
+ 920 -_-
+lc52
+lOm
+1x7
+1150 ___
+1 357
+13OO
+1513
+1450
+1663
+1600
+ 46 + 57
+32 t32 ---_---
+60 t72
+ 42 + 42
+ 74 + 86
+ 52 + 52 __-_______
+ 91 + 107
+64 +64
+ 104 + 120
+ n + n + 131 + 150
+9&l +98
+ 151 + 170
+ 118 + 118
+ 187 + 210
+ 146 + 148
+ 219 + 242
+ 180 + 160
+ 272 + 300
+226 +226
+320 +348
+ 274 + 274
+389 + 422
+335 +335
+454 + 467
+400 +4co
+533 + 570
+ 470 + 470
+596 + 635
+ 535 + 535
+663 + 700
+600 l 600
+ 742 + 785
+ 670 + 670
+ 812 + 655
+ 740 + 740
+ 692 + 935
+620 +620
t1001 +1060
+ 920 + 920
+1061 +l 130
+1000 +lOlm _____~ _~__
+1239 +1290
+1150 +1150
+1369 +1440
+1300 Cl300
Cl547 +16c%
+1450 11450
41 697 +l 755
+16Lm +1600
+ 72 + si +32 +3i
+ So + 111
+ 42 + 4i
+ 110 + 1G
+52 +5i
+ 134 + 174
+64 t ,d
+ 147 t, '187
t n Y ?i +1a2 +m + 93 ‘+ 9f +202 + 24f
+ 118 + 11E
t248 +3OE
t 148 + la
t280 +34c
+ 180 + 18c
+346 + 4x
t226 +ni
+3%l +46L
+ n4 + 274
+ 475 + 55f
+335 +33!
+54O +62c
+400 +4OC
+630 +7x
+ 470 + 47c
+695 +m
+535 +53E
+760 +85t
+600 +6Ot
+&a +9lx
+ 670 + 67c
+ 925 +103t
+ 740 t 74c -_-
+1m +1 11c
+620 +f32c ~___~
+1 130 t1240
+ 9x + 920
+1210 +1320
t1coO ClcoO
+1380 +1 510
b1150 +1150
+1530 +1660
+13OO +1300
+1700 +1850
+1m Cl450 __
+1850 +2000
+1600 t1600
za
------- 1
1) Fundamental deviations z and za are not provided for basic sizes greater than 600 mm.
37
IS 919 ( Part 2 ) : 1993 IS0 286-2 : 1988
Table 32 - Limit deviations for shafts zb and zc1)
Upper limit deviation = es
Lower limit deviation = ei
Deviations in mlcrometres -
Basic size zb ZC
mm
up to
Above and in- 7 a 9 10 11 7 a 9 1: 11 eluding
- 3 :,” 1,” 1,” 1,” + loo + 70 + 74 + 85 ‘.+ loo + 120
+40 +&I +Kl +60 +,&3 +I3
3 + 125 + 92 + 99 + 110 + 128 + 155
+50 +80 + 90 +80 +@I +90 ,
_
I
1 I Fundamental deviations zb and zc are not provided for basic sizes greater than 500 mm.
38
IS 919 (Part?): 1993 IS.0 286-2:1i88
Annex
Graphical review of tolerance zones of holes and shafts
(This annex does not form an integral part of the standard.)
A.1 Representation of tolerance zones for holes
A graphical review of a broad selection of tolerance classes for holes is given in figures 6 and 7. Figure 6 shows the tolerance classes In
terms of the fundamental deviation (A to ZC), whereas figure 7 gives the same Information in terms of the standard tolerance grade
(IT5 to IT1 1). Figures 6 and 7 do not include all the tolerance classes given in this part of IS0 286 and reference should be made to the
tables for specific details.
For comparative purposes, the tolerance classes given in figures 6 and 7 illustrate tire values for I<S, t/and IT grven for the basic size
step from 6 to 10 mm. Where there are no tabulated values for thus basic scze step, i.e. those tolerance classes involving fundamental
deviations T, V and Y, the values have been given, again for comparative purposes, for the basic srze step from 24 to 30 mm.
A.2 Representation of tolerance zones for shafts
A graphical review of a broad selection of tolerance classes for shafts IS given in figures 8 and 9. Frgure 8 shows the tolerance classes
in terms of the fundamental deviation (a to zc), whereas figure 9 gives the same information in terms of the standard tolerance grade
(IT5 to IT1 1). Figures 8 and 9 do not include all the tolerance classes given in this part of IS0 286 and reference should be made to the
tables for specific details.
For comparative purposes, the tolerance classes given in figures 8 and 9 illustrate the values for (‘5, (‘I and IT given for the basic srze
step from 6 to 10 mm. Where there are no tabulated values for this basic srze step, i.e. those tolerance classes involving fundamental
deviations t, v and y, the values have been given, again for comparative purposes, for the basic srze step from 24 to 30 mm.
39
IS 919 ( Part 2) : 1993 IS0 288-2 : 1988
Pm +500
+400
Pm
+ 100
0
- 100
A 6. c CD cl E EF F FG G H J 9 11 13 9 n 13 9 11 U 7 9 6 0 WI12 5 19 5 7 9 5 7 9 5 19 5 7 9 5 7 9 n 13 7 10 12 8 10 12 8 x) 12 6 fJ D 7 9 11 0 6 8 10 6 8 10 6 18 10 6 0 I3 6 8 x) 6 8 Y) 12 6 8
Zero line
Figure 6 - Graphical review of tolerance classes for holes in terms of fundsmentm deviations
40
,
IS 919 ( Part 2)‘: 1993 IS0 288-2 : 1988
Pm +200
+I00
0
-100
+300
+200
+I00
0
-100
I Iml I I I I I I I I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I I I I I I I
(concluded )
,
Figure 7 - Graphical review of tolerance classes for holes in terms of standard tolerance grades 41 ir
IS 919 ( Part 2) : 1993
IS0 288-2 : 1988
-200
-300
0
- 100
~concluded)
js k m n p r s t u v x y z za zb zc 8 10 12 5 1 9 n 5 I’ 5 I 9 11 13 8 5 I 51515151 6 10 12 6 8 68686868 951519 6 0 19 6 8
6 8 6 8 10
10 6 8 6 8 8 10 8 x)
Dl6 8 IO 19 7 9 7 9
Figure 8 - Graphical review of tolerance classes for shafts in terms of fundamental deviations
5
42
IS 919 ( Part 2 ) : 1993 IS0 286-2 : 1988
Pm
+ 100
0
(concluded I
I IT8 I IT9 I IT10 1 ITll
- 100
- 200
Figure 9 - Graphical review of tolemnce classes for shafts in terms of standard tolerance grqdes
43
Bureau of Indian Standards
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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 periodically; 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 referring to the latest issue of ‘BIS Handbook’ and ‘Standards Monthly Additions’.’
This Indian Standard has been developed from Dot: No. LM 01 ( 40 )
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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