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in order to promote transparency and accountability in the working of every public authority,
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“Step Out From the Old to the New”
Mazdoor Kisan Shakti Sangathan
Jawaharlal Nehru
IS 1105 (1957): Method for precise conversion of inch and
metric dimensions to ensure interchangeability [PGD 1:
Basic Standards]
“!ान $ एक न' भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”
है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
( Reaffirmed 2005 )
Indian Standard
.
METdOD FOR PRECISE CONVERSION OF
INCH AND METRIC DIMENSIONS TO
ENSURE INTERCHANGEABILITY
(Fourth
Reprilit AUGUST ,I990 )
0
.‘
U D C 511*162*3:621.7:744
Engineering
DR
Standards Sectional Committee,
K. S. KRISHNAN
EDC 1
Council of Scientific & Industrial Research, New Delhi
Msmbsrs
Central Board of Irrigation 6 Power
Engineering Research Department, Hyderabad
Directorate General of Observatories (Ministry
munications )
Roads, Organization, Ministry of Transport
SHRI BALES’IIWARN&I
‘DIIUXTOR
DI~U~CIORGENERAL
. .’
:,., ‘.g‘i
SHRI GOVERDHANLAL
SWRI J. M. TREHAN (Alternate )
SHRI S. B. Josnr
SHRI R. N. KjrPUR
DR R. S. KRXSHNAN
SRRI J. S. MATHUR
SHRI S. R. MEHRA
Spur S. N. MUKERJI
SHRI K. D. BHATTACAARJI ( Ahrrrala )
DR
of Com-
The Institution of Engineers ( India ). Calcutta
Indian Engineering Association, Calcutta
Indian Institute of Science, Bangalore
F,*,ectorate General of Supplies & Disposals ( Ministry of
Works, Housing & Supply)
Council of Scientific % Industrial Research, New Delhi
Government Test House, Calcutta
Council of Scientific & Industrial Research, New Delhi
Cprltral Water & Power Commission
Technical
Establishment
( Weapons ).
Development
Ministry of Defence
B. R. NIJHAWAN
SIIRI V. R. RAGI~AVAN
COL J. R. SAWON
LT-COL R. JANARDHANAM( Allcrnale )
Engine&ing Association’ of India, Calcutta
Central Standards Office ( Ministry of Railways )
Council of Scientiric & Industrial Research, New Delhi
Director , IS1
Deputy Director ( Bngg ), IS1
SHRI J. M. SINHA
SHRI K. C. SOOD
MAJOR GENERAL H. WILLIAMS
DR LAL C. VERMAN ( Ex-oficio )
SHRI J: P. MEHROTRA ( ~hWTUI& )
Extra Assistant Director
SHRI T. PURNANANDAM
, IS1
@ CopVriglrt 1957
BUREAU
MhNhK
OF
BHAVAN,
INDIAN
9 %hHhDUR
NEW
DELHI
STANDARDS
SHAH
ZhFhR
M,hRG
110002
..
.
Gr
December 1957
10
/
_.__&,*.
f
I
._?
*-+I
._
-
\-_
D
IS : 1105- 1957
CONTENTS
PAGE
0.
FOREWORD
1. SCOPE
2.
...
TERMINOLOGY
.*.
...
.. .
...
...
.. .
. ..
...
..,
.
.
.
. .
.
2.1 Feature
.. .
...
...
.
2.2 Dimension
...
.*.
..*
*..
2.3 Tolerance
...
. ..
.. .
.
...
.. .
2.4 Fineness of Rounding
3. BASICDATA
. ..
.. .
3
. ..
...
4
..*
. ..
4
...
...
4
a..
. ..
5
...
i
. ..
6
a..
. .
.
.a*
.
.
..I
. .
...
.,
.*.
*..
3.1 Rules for Rounding Off
..,
..
..a
*..
3.2 Fineness of Rounding
. ..
.. .
. . .
.**
3.3 Conversion Factor
. ..
...
. ,.
..*
.
3.4 Conversion Tables
. ..
...
.,.
. . .
..*
. . .
. . .
. . .
.
. ..
4. RULES FOR CONVERSION
OF DIMENSIONS. . .
4.1 Simple Feature Dimensions
. ..
.. .
4.2 Positional Dimensions
.. .
..,
4.3 Datum Dimensions . . .
. ..
.;.
. . .
4.4 Untoleranced Dimensions
. ..
. .,
. . .
4;s Standard Feature Dimensions
.. .
. ..
. . .
. . .
2
.
.
.
.
.
6
6
.*.
6
.. .
. ..
6
...
6
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6
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7
.
.
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8
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.
...
10
...
11
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.
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.*.
..*
. .
IS : 1105 - 1957
Indian Standard
METHOD FOR PRECISE CONVERSION OF
INCH AND METRIC DIMENSIOHS TO
ENSURE INTERCHANGEABILITY
O.FOREWORD
0.1 This Indian Standard was adopted by the
Indian Standards Institution on 3 September 1957,
on approval by the Engineering Division Council
of the draft finalized on 31 August 1957, by the
Engineering Standards Sectional Committee.
0.2 The Union Parliament having adopted the
Standards of Weights and Measures Act, 1956,
the Government of India is now concerned with
expediting the introduction of the metric system
of weights and measures in various branches of
commerce and industry.
As a part of this endeavour, the Indian Standards Institution is expected to change all its standards to the new basis
of measurement so as to furnish at the earliest
possible stage the necessary guidance to industry
and commerce for changing over their operations
from the present set of units to metric units. The
programme of the Institution also includes the
evolution of appropriate procedures to guide the
conversion of existing standards in a uniform and
rational manner. The Indian Standard Guide for
4
4
and inspected in terms of the other set of
units ;
Parts detailed on inch drawings may have
to be manufactured on machines calibrated
in metric units, or vice versa;
Parts manufactured according to inch draw-
ings may have to be inspected with tools and
gauges based on millimetre dimensions, or
vice versa ;
4 Inch-based stock materials may have to be
used to produce metric-based parts, or vice
versa;
f1 Basic standards of stock materials and all
engineering design codes and practices shall
have to be revised from inch basis to metric
basis; but in this revision, many other considerations, besides the exact conversion of
nominal dimensions, will be involved.
0.4 In conversion of drawings it should be ensured
that component parts made to drawings dimensioned in one system should be interchangeable
with parts made to drawings dimensioned in the
other system. Such interchangeability can, of
Inter-Conversion of Values from One System of
Units to Another ( IS : 787-1956) lays down tlie
basic principles to be followed in all conversion
problems relatin to any branch of work. A part
of IS : 787-195% deals with the principles of
inter-conversion of inch and millimetre dimensions. The treatment of the subjeot presented in
IS : 787-1956 is, however, not considered detailed
enough for adequate guidance of those concerned
with inch-millimetre conversion of dimensions for
interchangeability as a daily routine. In order to
avoid the necessity for detailed consideration of
each conversion problem in the light of the basic
principles, and to reduce the related calculations
mvolved, this standard is beii issued. It prescribes readymade and simple rules and detailed
tables, which should facilitate the work of
engineers, designers, draftsmen, shop-workers and
others.
0.8 During the period of the change-over, many
situations will arise where dimensions expressed
in inches will have to be converted to millimetres
Some
and vice versa to ensure interchangeability.
of these instances may be as follows:
a) Most dra ’
at present- in use being on
inch basis7 ’ 1 have to be converted to millimetres;
b) Parts manufactured and inspected in terms
of one set of units may be required to be
interchangeable with parts manufactured
course, be ensured by making conversion to a very
high degree of accuracy, that is, by calculating the
converted size to a large number of decimal places.
In practice, however, although a part has certain
1hmt.sof size mentioned in its drawings, parts with
actual limits equal to drawing limits plus or minus
the accuracy of measurement employed, will be
accepted in inspection. There is little purpose
served, therefore, by converting to a precision
which is finer than that of the method of measurement which is likely to be employed in inspecting
the part.
0.4.1 For example, the limits of the diameter
of a crank pin, are given as 2.280 in and 2,278 in
‘Amicrometer ( graduated in O&Min ) will normally
be used for inspection. With such a mimeter
it mhy be possible to estimate a reading to a fineness of O*OOO
1 in, but not to a greater degree of
fineness. So if the actual diameter is 2.280 1 in ,
it may be read by the micrometer as 2.280 in, and
the p?rt will be accepted. Similarly an actual
diameter of 2.277 9 in? may be read by the micrometer as 2.278 in, and the part will be accepted.
Hcncc, while the drawing specifies limits of 2.280 in
and 2.278 in in practice, parts within actual
limits of 2.2801 in and 2.277 9 in, will be acceptcd in inspection. When converting the inch limits
3
IS : 1105 - 1957
rt to metric limits there is no purpose
of this
served !ay convertin to a, precision higher than
O*OOO
1 in ( or 0*002‘J mm ), rf the converted value
$ rounded off to a fineness of 0.005 mm, the converted limits will not vary from the original limits
by more than 0.000 1 in (or 0.0025 mm) and parts
made to the converted limits will, in practice,
be interchangeable with parts made to original
limits.
0.5 The accuracy of measurement is primarily
dependent 011the basic accuracy of the measuring
instrument employed; it is also affected by the
skill of the inspector, the material from which the
part is made and the nominal size, the surface
finish and the errors ‘of geometric form of the
feature being measured.
0.5.1 In good engineering practice the accuracy
of measurement is of the order of f 2 to f 4
percent of the feature tolerance. With presentday measuring instruments and inspection techniques it is doubtful, however, whether a higher
recision of measurement than about -&0*00003 in
4 or f 0.75 p ) is quantitatively attainable. This
figure corms nds to f 3 percent of a feature
tolerance of op”
801 in (or O-025mm), and to a progressively increasing percentage of the feature
tolerance as the latter is reduced below 0.001 in
When converting limits, therefore, if the converted
limits are rounded off to the nearest 5 percent of
the feature tolerance where it exceeds O*OOlin
or 2~51~), the maximum error in conversion will be
1-5 percent of the feature tolerance; if the converted limits are rounded off to the neare$O*OOOO5in
( or 1 p ), when the feature tolerance is less than
O@N in. ( or 2.5 p ), the maximum error in conversion will be 0~000025 in ( or 0.6 p ). These errors
are less than the accuracy of measurement and so
effective dimensional interchangeability of parts
made to original and converted ‘limits will be
achieved.
their metric equivalents or vice versa. The degree
of accuracy that would result would be adequate
to each individual conversion involved for all pur
poses, including design, manufacture, inspection
and functionality.
0.7 It must be particularly noted that th’ Stan‘mendard covers only the $recise conversion of )%1
sions where it is required that the use of the
original and the converted dimensions should lead
to products which are freely interchangeable.
This standard does not deal with the procedure for
the conversion of national or industrial stutiard
drawings from one system of measurement to
another. It must be appreciated that, in the
latter case, when converting nominal dimensions
and standardized dimensions, several considerations have to be taken into account, besides. the
arithmetical conversion of given values. A brief
treatment of this subiect
will be found in
a
IS : 787-1956.
6.8 Acknowledgement is due for the assistance
derived from the following British Standards:
B.S. 308:1953 ENGINEERINGDRAWING PRAG
TICE
B.S. 2517:1954 DEFINITIONSFOR USE IN MECHANICALENGINEERING
B.S.
2856:1957 PRECISECONVERSION
OF INCH
AND METRIC SIZES ON ENGINEERING
DRAWINGS
0.9
The present standard is one of the series of
Indian Standards on numerical values, their interconversion, etc. Other standards in the series
are :
IS: 2-1949 RULES FOR ROUNDINGOFF NUMERICALVALUES
IS: 3-1949 INCH-MILLIMETER
CONVBRSION
FOR
INDUSTRIALUss
IS: 786-1956 CONVERSION
,FACTORSAND CONVERSIONTABLES
0.6 Based on these considerations, and those disIS: 787-1956 GUIDE FORINTER-C• NVBRSION
OF
cussed in IS : 787-1956, a simplified set of rules has
VALUES FROM ONE SYSTEM OF UNITY TO
been evolved as given in the present standard.
ANOTHER
Certain definitions of terms and tables of converIS:
1020-1957 CONVERSION
TABLES FOR ORDIsions have also been included, which will facilitate
NARY USE
understanding and practical application of the
rules in day-to-day work. By following these 0.10 This standard also requires reference to
rules, no difficulty should arise in converting pre- ‘IS : 6961955 Code of Practice for General Enginecise dimensions expressed in terms of inches into ering Drawings.
*Since revised.
1.
‘P
b)
cj
d)
e)
SCOPE
1.1 This staadard gives a simplified set of rules
for the precrse conversion of dimensions from
inches to millimetres and vice versa to ensure
interchangeabilit . The rules are meant for use
particularly in tK e work of engineers, designers,
&aughtSmen and shop-workers:
Positiona! Dimensions
Datum Dimensions
Untoleranced Dimensions
Standard Feature Dimensions
2. TERMINOLOGY
2.0 For the purpose of this standard, the following
definitions &ali apply.
1.1.1 The following categories of dimensions* 3.1 Fmtrsm -An individual characteristic of a
am covered:
part, such as cylindrical surface, screw-thread,
a) Simple Feature Dimensions
slot, 8e.t rutface, or profile.
4
IS : 1105- 1957
2.3 Tolerance -The total amount
permitted for the size af a dimension,
relationship,
or any other design
( for examples see Table I ).
2.1.1 Standard Feature - A feature whose shape
and size have been fixed by a standard with a view
to facilitating
interchangeability
of commonly
occurring machine parts, such as screw threads
for bolts and nuts, gear teeth for gears, splines for
splined shafts, sheet and wire gauges, shapes and
sizes of metallic sections including structural steel
sections, etc.
2.1.2 Positional Feature-One
of a group of
features which is required to conform to a specified
positional relationship with others in the group
(for example see Fig 1, see ‘also 2.2.2, 2.3.6
and 2.3.7)
-A
geometrical
element in a
2.2 Dimension
design, such as a length, diameter or angle, of
which the size is specified.
2.2.1 Size -A
general term denoting magnitude of any kind.
2.2.2 Positional Dimensiolt - One which specifies the positional relationship of a feature with
respect to another feature.
2.2.3 Datum Dimekon
-A
theoretically exact
dimension which locates a datum point, line, or
plane at which a feature must be within certain
limits of size. The term is also used to define a
cross-sectional plane of a feature, the location of
which may vary within specifed limits
( for
examples see Fig 4 and 5 ).
2.2.4 Design Dimension ( or Size )- The dimension ( or size ) which, in association with the limits
of tolerance, serves to define the relevant design
requirement
( for examples see Table I ).
TABLE
I
E XAMPLBS
To
ILLUSTRATE
SOME
of variation
a positional
requirement
2.3.1 Limits of Size ( or Limiting Dimensions )The maximum and the minimum sizes (dimensions) within which the size ( actual dimension) is
permitted to vary; also termed upper and lower
limits of size ( for examples see Table I ),
2.3.2 Limits of Toleralzce ( or Tolernltce Limits )The maximum amounts, positive and negative,
by which the actual (or measured dimension is
permitted to d part from the design dimension
( for examples see Table I ).
2.3.3 Bilateral Tolerance - The tolerance
in
which variation is permitted in both directions
from a design dimension or true position of a
feature.
The variation may be equal or unequal
in
the
two
directions
( for
examples
see
Table I ).
2.3.4 Uniliteral Toleravxe - The tolerance in
which variation is permitted only in one direction,
positive or negative, from the design dimension
or true position of a feature
(for examples see
Table I ).
2.3.5 Feature Tolerance -The
tolerance on the
size of a feature, such as the diameter of a pin or
holc,.or the width of a slot, as distinct from the
pontzonal tolerance on the true position of the
feature in relation to other features.
2.3.6 Positional Tolerance - The total amount
of variation permitted for the location of a feature.
OF THE
TEEMS
DEFINED
UNDER
TERMINOLOGY
(Cluu.rc 2)
lGNEN
DIMENSION
DaeIGN
DIHENS~ON
in
3562
lirJ@
-+o
-o@OO 3
C
3.400(
rto.05
‘-“,:El
10.5~to:01
359
355
LIMITING DIMXNSION
( Lxurrs OF SlZE )
XATURE OF
TOLERANCB ‘
.upprr
in
in
-
in
-
-
-
0.002
+0.001
-0GO1
2.501
2.499
Nil
Equal Bilateral
1.250 0
0402 5
+oGo2 0
-O+OO 5
1.252 0
1.249 5
Unequal Bilateral
0*500 0
o.ooo3
0903
+o*lMO 0
-
-0.000
-
o*sOO0
3.562
0.499 7
3.559
Unilateral
mm
153.5
14.20
LIMITS OF TOLERANCE
L
’ Positive
Negative ’
in
-
in
21.75
2.500
o-5
TOLBRANC~
in
3
mm
-
mm
-
mm
-
+0.05
-@OS
14.25
14.15
o&X
+oGO1
-0.060
0.01
4
$0.01
-
-0GO
-
mm
153.5
14.20
0.10
3400
10.50
mm
-
3.401
10.51
359
3-340
10.50
355
Nil
Equal Bilateral
UnequalBilateral
Unilateral
-
*The different dimensions given as examples in this column represent the different ways in which one will come
across dimensions on drawings. generally. The Indian Standard method of expressing numerical values requires all
significant zeros to be included and non-significant zeros omitted as has been done in case of figures given under all
other columns o+ the table ( see also IS: 787-1956 and IS: 696-195Ss).
*Since revised.
5
__
IS : 1105 - 1957
This is the legally recognized conversion factor
fcr use in India according to the Standards of
Weights and Measures Act, 1956.
Positional tolerance may be distributed bilaterally
in a normal manner or in all directions round a
centre ( seeFig 1, 2 and 3, see also 2.3.7 ).
2.3.7 Geometrical Positional
Tolerance - That
positional tolerance in which the tolerance is distributed in ah directions around the true geometrical position.
3.4 Converrion Tables -With
a view to eliminating the need for repeated calculations and thus
minimizing chances of error, the following conversion tables are appended to this standard for use
in converting dimensions :
NOTB -It
will be seen that the geometrical positional tolerance is twice the maximum permitted
departure from the true geometrical position (see
Fig 1 and 3).
Inches to Millimetres
Table IIIA Range:
Table TIIB Range:
Table IIIC Range:
2.4 Fineness of Rounding-The
unit to which
the value is rounded off. For exam le, 253
rounded off to a fineness of O-1 will be %‘5,
3. BASIC
4.1 Simple
TOLERANCEoB ORIGIXUAL
DIMSNSION
ZY””
0:1
mm
O*ool
8::’
5
Up to But Not
Including
in
X8’
1
XS’
5;
Feature Dimensions
RULE 3 - Find the tolerance of the feature
and obtain from Table II, the appropriate
W
of rounding.
RULE 4 - Uew thie lkeneu M roundin&
round off the converted limite of eize ae
obtained under Rule 2, in accordance with
the ruler rpecifled in IS : 2-194fl s08 ale0 3.1).
7CEz:
,
mm
RULE 5 - If de&ad, the limit8 of eize may
be exprerred in term6 of deeian dimeneion
together with plus and minue tolerance iimite,
for which purpose deal with the 3 cases that
arise air follows :
a) For Unilai~raC To&raw6 - Simply take
the difference
between
the converted
limits
of Mw as the tolerance
( see
Example 3 ).
b) For Equal Biiataral Limits - Take the
difference between the converted limits
of size, and if this happens to be even,
Just divide by two to obtain the tolerance
limit : if it is odd, subtract one in the laet
place before halving ( WC Example 2 ).
c) For Unequal Bilateral
Limits - Convert
the smaller of the two original tolerance
limits to the required units by the use
of the appropriate
tables ( a8 under
in
0000 05
\
OF
RULE 2 - Convert the limits of 8ize from
the given unite to the required units by the
use of appropriate tables of inch to millimetre
aeriee ( Tables IIIA, IIIB, IIIC and IIID )
or millimetre to inch aeriea ( Tables IVA and
IVB ) IU the case may require.
8:’
0:1
mm
CONVERSION
RULE 1 - If limits of size are not directly
stated in the given dimension,
derive the
limits by using the design dimension
and
tolerance limit* given.
TABLE
II FINENESS
OF ROUNDING
BOR
CON\iERSION
OF TOLERANCED
DIMENSIONS
in
l-l 000 mm ( see P19 )
0~001-1~000 mm ( see Pt3 )
4. RULES FOR
DIMENSIONS
3.2 Fineness of Rounding -For the precise conversion of dimensions according to thii standard,
fineness of rounding shall be chosen from the values
given in Table II in accordance with the magnitude
of the tolerance in the original given dimension.
From
Millitnetres to Itwb
Table IVA Range:
Table IVB Range:
Table IIID
DATA
3.1 Rules for Rounding Off-The
converted
numerical
values of dimensions, tolerances, etc,
shall bL rounded off in accordapce with rules
specified in IS: 2-1949. which may briefly be
summarized as follows:
a) Round off to the nearest digit, unless the
unrounded
value falls exactly midway between two possible adjacent
rounded-oft
values, in which case choose the cveu rounded
value.
b) Use the most precise value known with all
the available figures, for applying the above
rule.
C
Range:
l-100 in. (see P12)
0~001-1~000 in. (see Pi3)
0.000 Ol-O*OOl00 in. ( see
Y17)
& to 1 in. (see pl8)
Ez’
0.01
3.2.1 For tolerances finer than 0~00005 in. and
OXlO mm, this table does not apply.
Such fine
tolerances may occur in certain t
of high precision work, and must be dealt wyp”
h w a special
case in accordance with the basic principles enunciated in IS: 787-1956.
3.3 Conversion
Factor - The basic conversion
factor for inch-millimetre
conversions shall be
1 inch = 254 millimetres (exact ).
lSiqFe revised.
6
+Sincerevird.
Rule 2 ) and round it off ( ae under Rule
4) to the came fineneee of roundln$ 8e
previouely determined under Rule 2.
U8ing thio converted vaiue a8 the 8maller
of the two converted tolerance limito,
derive the other converted limit and
the converted deelen dimenrion ( tuu
Example 1).
By Rub
size are:
2434 5 z i:E
By Rule l- Limits to be converted
2.435 10 in. and 2.434 45 in.
by Rule 2 -
Look up the converted
limits
of
44*82 and 43.29 mm
.’. Tolerance
1imit=(1~53--0~01)x0~5=0~76
mm
44.82 + 43.29
and Design dimension = --2
= 44.055 or 44.06 mm
* The converted size may, if desired, be speci*
ii;d as:
44.06 f 0.76 mm
z5 in
are:
values of
NOTK - The lower converted limit obtained from this
last statement is 43.30 which differs by 0.01 mm from
the limit 43.29 obtained
directly above.
This discrepancy is unavoidable.
but will cause no difficulty
in practice so far as production,
inspection and functional interchangeability
are concerned ( see also last
sentence of 0.4 ).
Add up the groups as required to obtain the
converted values of the given limits:
H3445
in
2438 10 in
508
508
11.023 6
11.049 0
o-011 430
o-002 540
61851548 mm
61.835 030 mm
By Rute 3 -Tolerance
= O+lOO6 + 0$100 05 =
O&JO 65 in. From Table II, we find that for this
tolerance, Fineness of Rounding = 0801 mm.
By Rule 4 -Round
off the millimetre converted limits to the fineness of 0.001 mm and obtain
he answer as:
61.852 and 61.835 mm
By Rule S(c)-These limits, if desired, may
be expressed in terms of the design dimension and
tolerance limits as follows:
Converted
tolerance = 61.852 - 61.835 I
0.017 mm. From Table IIIC, the smaller of the
two. original’ limits of tolerance,
O$OO05 in = O%l1270 mm,
which after rounding
7 O-001 mm
.’. Design sire = 61~835+0~001=61~836 mm
+ 0.016
and the converted size = 61.836 _ 0801 mm.
Exm4lc
the converted
By Rub S(b) - If desired, proceed further:
Converted tolerance 44*82-43,29= 153 mm
Example 1
Convert to millimetres
4 -Thus
Example 3
Convert
into inches 117.5 + 0*05 mm.
By Rule 1 llF55 mm
117.50 mm
By Rule 2 4606 299
4.606 299 [Table IVA]
0.021 654
0,019 685 [Table IVB]
4.627 953 in -984
in
By Rde 3 -
Fineness for 0.05 mm is a000 I in
[Table II)
By Rule 4 - Converted limits:
4.628 0 and 4.626 0 in
By Rule S(a) - If desired, express converted
size as 4.626 0 + 0*002 0 in
4.2 Positional
Dimensions
4.2.0 Any simple features, such as holes, pins
or slots, besides having their sizes toleranced in the
normal way, may have their relative positions
toleranced in either of the two ways as indicated
under 2 and Fig 1. Their conversion shall be
carried out by procedures outlined under 4.2.1 and
4.2.2.
4.2.i Normal Bilateral Positional Tolerames
RULE 6 -When
positional
dimension
is
specified in terms of true positional dimension
and a bilateral tolerance in the normal way,
carry out the conversion in the same manner
as for the simple feature dimensions according’ to Rules 1 to 5, except that in this case
application of Rule 5 shall be obligatory.
Note -There
is nothIn& n&einst specifyinO
poaltional tolerance In a unilateral manner, but
this IS not normal practice. In case it does occur,
It may be handled for conversion In the same
manner as a bilateral positional tolerance.
Example 3
2
Convert to millfmetres 144 f 0.03 in
ByRu&ll$f in -1.734 38 in
[Table I IID]
Limits of size:
iI
38 in
1.70438 in
l
By RUZC225.4
25.4
[Table IIIA]
19.405 6
17.881 6
[Table IIIB]
-009 652 [Table IIIC]
a009 652
m
mm 43.291252 mm
-For
tolerance of O-06 in,
= 0.01 mm [Table II]
Convert into millimetres
sions of Fig 2.
7
the positional
dien-
c
IS: 1105 - 1957
By Rde
6-
I.00 -f @02 in
1.02 in
@98 in
z
*--z_
0.508-_0
24.892 0
_.__
25.908 0 mm
24.892 0 mm
and
350 f @02 in
352 in-3.48
in
[Table IIIA]
[Table IIIB]
73
7z.
[Table I II A]
13.208 0
12.192
[Table II&]
-._--0
89.408 0 mm
88.392 0 mm
For tolerance of 0.04 in, fineness of rounding
from Table II is 0.01 mm.
@ Therefore, the coqerted
limits are:
25.91 and 24.89 mm
and
89.41 and 88.39 mm
Expressed as a positional dimension in the
normal manner, the converted dimensions will be:
25.40 f O-51 mm
and
88.90 f 0.51 mm
4.2.2 Geometrical Positiofaal Tolerances
RULE 7 - When positional
dimension
is
defindd in terms of true ( or design ) posltlonal dimension and a geometrical tolerance,
carry out the conversion
separately
for the
true positional dimension and the geometrical
tolerance,
using the appropriate
tables as
under Rule 2; then round them off by using
the fineness of rounding appropriate
to the
given ( geometrical ) tolerance, found from
Table II as under Rule 3.
--Example 5
Convert into millimetres
sion of Fig 3.
the positional
dimen-
By Rule 7&000 6 in
-
2402 7 in
0.015240
0.015 240 mm
50.8
10.210 8
--.0.017 780
61.028 580 mm
[Table IIIA]
[Table IIIB]
[Table IIICJ
From Table II, fineness of rounding for a tolerance of 0.000 6 in is 0.001 mm. Thus the converted dimensions wili be:
61.029 mm with a Positional Tolerance
of 0.015 mm.
4.3 Datum
Dlmen$ions
4.3.0 When converting datum dimensions, from
one system of units to the other, care shall be
exercised to ensure that error of conversion due to
rounding off a theoretically exact dimension does
not add to the error arising from the conversion
of the associated
toleranced
dimensions.
By
following the procedure outlined in Rules 8 to 11
below, accumulation of such errors will be avoided.
4.3.1 Rules for Datum Dimcn.sions
RULE 8 - Convert the theoretically
erect
datum dimension as under Rule 2 and round
off this ,converted dimension to four places. of
decimal in inches and three places of decimal
in mllllmetres.
RULE 9 -Assuming
the rounded value to
be exact, take the difference between it and
the unrounded value.
RULE 10 - Consider the adjustment
that
the above-noted difference, will require to be
made in the limits of the associated toleranced dimensions,
if fi~ll account of it were to
be taken. Wherever necessary, calculate the
exact amount of variation that it will cause
in the associated toleranced dimension(s).
a datum
dimension
locatea
a
Note -When
datum plane, as in Pig 4, the equivalent diameter
or width variation of the tapered feature ie found
by multiplying
the difference ( noted under Rule 9 )
by the rate of taper.
When the datum dimension
is the diameter or width of the tapered feature,
as in Fig 5, the equivalent
length variation
ie
found by dividing
the differeuce
(noted
under
Rule 9) by the rate of taper.
Convert
the associated
toleRULE llranted dimension(s), using the procedure outlined under Rules 1 to 5 but before roundln%
off the converted values, make appropriate
adjustments
o allow for the variation found
under Rule : 0.
Example
b
--
_--
Convert the dimensions of Fig 4 into millimetres.
By Rule 8 - Datum plane dimension :
@875 in
[Table IIIB!
22.225 0 mm
Round to 22.225 mm
By Rule 9 - Difference is nil.
By Rule 10 - No adjustment
is necessary.
By Rule ll1.250 -WOO2 in
1.248 in
1.250 in
25.4
- 6.350 0
31.750 0 mm
[Tables IIIA
2Gand
IIIB]
6.299
2
31.699 2 mm
Fineness of rounding for a tolerance of 0.002in
being 0.001 mm ( Table II ), fhe above values may
be rounded to 31.750 and 31.699 mm.
Examfile 7
Convert the dimensions of Fig 5 into millimetres.
By Rule 8 - Datum diameter dimension:
l-187 5 in
25.4
4.749 8
0.012 70
30.162 50 mm
Round to 30.162 mm
[Tables IIIA,
IIIB and
IIIC]
kRe@m
in which ccntre
hok may lie 7
%&
P-4
POSN TOL 0*04ti
BILAT8lUUL~~lSI8UT80
QEOMDTRICM COSITIONAL
TOLERANCE
FIO 1 Exnr~~tr OF Pormoru~
FISATURES AND TOLERANCES
POSN TOL
FIG 2 BILATERAL POSITIONAL TOLERANCE
1%
3
GEOMETRICAL
TAPER PER INCH
ON DIA I IN IO
DIA
POSITIONAL TOLERAKCE
TAPER PER INCH
DIA I IN IO
DATUM --/--+j
O*S65;
+0*0003-
FIG 4
FlG 4 AND 5
O*OOO;l
EXAMPLES
9
OF
.
DATIJ~I DIiW_Nsfoi&
FIGS
IS : 1105 - 1957
By Rde 9 - Difference = OXlOO50 mm.
Bv Rde 10 -The
rounded value being smaller
than ihe unrounded, the difference will have the
effect of moving the datum diameter towards the
smaller end of the taper and thus reducing the
toleranced len th dimension by an amount :
0.0 10 50 x 10 = O-005 0 mm
By Rule 11 OS66 S +
WOO03 in
W655 in
@56S
8
in
-_
1$:X; &mm 1;3&\rr
.
[Tables IIIB
and IIIC]
14371 32 mm I%“,
‘00mm
[By Rule 10,
-0*0050
*
-14.366 32 mm i4;358
mm see abore]
Fineness of rounding for a tolerance of OGOO3
in. being O%U mm ( Table II ), the above values
may be rounded to:
14.366 and 14.359 mm
SOTB- It may be noted that the adjusted limits
in the present case are appreciably
smaller thau the
unadjusted limits. In a tolerance of 04JO7 mm ( 14.366 14.359 mm ), an adjustment
of OX@5 mm is quite
significant and could not possibly bc ignored iu the
class of precision involved.
4.4 Untoleranced
Dimensions
4.4.0 In this category may be included all dimensions specified without any tolerance, either
explicitly stated or implied.
Implication
of a
tolerance may arise under various circumstnnccs:
a) A covering note on a draWing
sometimes
specifies tolerances applicable to all untoleranted dimensions appearing in the drawing.
b) A code of practice for engineering drawings
sometimes indicates the tolerances that may
be -ascribed to untoleranced
dimensions appearing on clrawings prepared in accordance
with the particular
code, which may or
may nat carry a tolerance note ( see 13.2 of
IS :;696-1955’) *
c) Prevailing shop-practice in certain cases may
clcmand certain limits of accuracy to be maintained when working to untoleranced dimensions of a drawing.
d) Requirement
of mating with other parts
may at times necessitate a certain tolcrnnce
to be maintained in respect of an untoleranced
dimension.
Maximum and minimum dimensions are usually
stated without an indication of the accuracy required.
In accordance with the Indian Standard
practice, however, it would be necessary to state
such dimensions to adequate number of places of
For example,
decimal to indicate their accuracy.
1.5 in maximum would mean an implied accuracy
of -I- 0.05 in ; and 1.50 in minimum an accuracy
of - O*OOSin.
All these and other aspects of untoleranced dimensions are discussed in some detail in IS : 7871956, which is rccommendcd if further study is
desired.
For the purpose of this standard, the
*Since revised.
following rules are given for guidance,
but a
certain amount of discretion in their application
will be found helpful.
4.4.1 Rdes for Untoleranced
Dimensions
RULE 12-Consider
theuntoleranceddimension in all its contexts to find if any degree of
accuracy is implied or required for matinR
or for other purpose.
If so, ascribe to the
given dimension
the appropriate
tolerance
and convert it in accordance with the relevant
rules from among Rules 1 to 11. In stating
the result, simply
give the rounded value
without a tolerance.
RULE 13 -If
as a result of examination
under Rule 12, the context gives no clue as to
the possible or probable accuracy of the given
dimension, then ascribe to it an accuracy of
205 unit in the last place of decimal as given
in the original dimension, that is, a tolerance
equal to one unit in the last given place of
decimal.
In certain cases, it may be obviously desirable
to add an additional
decimal
place or two to the given dimension in which
case it may be done consistent with the ascribed accuracy of f0.5 unit in the last place.
In case the given dimension is in the form of
a vulgar fraction convert it first of 311 to
decimal notation rounding it off to retain as
many places of decimal as may be consistent
with the ascribed accuracy of f0.5 unit in
the last place of decimal retained.
Having
rewritten, the given dimension
on the above
basis proceed to convert as under Rules 1 to
11 and express the rounded result without a
tolerance.
Example 8 -Convert
into millimetres
a 45”
chmj;
in, which, according to the drawing,
is to clear a 0.1 in radius on the mating component.
of the
By Rule 12 - A cursory examination
problem indicates that it would suffice to express
the given chamfer as $‘= O-125 or 0.12 in, ascribing
a tolerance of f 0.005 in, since the radius to be
cleared may itself be cxpcctcd to be no more
accurate than 0.1, i.e. 0.1 f 0.05 in.
Thus
0.12 in = 3.048 mm.
From Table II, fineness of rounding
tolerance of 0.01 in is 0.01 mm.
for a
Thus
0.12 in = 3.05 mm.
Similarly, converting the radius, wc get
0.1 in = 2.54 mm = 2.5 mm.
Examfile 9 - Convert the height of a lathe bed
3 ft 4 in to millimetres.
By Rule 13 3 ft 4 in = 40 in
= 40 f O-5 in
= 1 016-O & 12.7 mm
=I000
mm
’
\
IS : 1105 - 1957
NOTE - It will be seen that coarse tolerances of the
order of 1 in. and above are not covered by Table II,
nor is it necessary to cover them. Sim le conversion
of a .-.
laree tolerance
.
. from inches to miJlilimetres. and
applymg it with discretion to the converted value to
obtain a reasonably workable answer is all that is
necessary, especially in cases of the tve
illustrated
in Example 9. In this example, it would, for instance,
be meaningless to round off the lathe bed height to any
other value but the nearest round figure of 1 000 mm.
A few millimetres above or beloti-the round figure
may have been important if the lathe height were to
match some other component or machine. In the
absence of anv such information. and in view of the
large variation of height of lathe workers, a round
figure in metric units should naturally be preferred.
Thus it is clear that a great deal of discretion
comes into play in dealing with such problems,
which are after all of secondary importance so far as
interchaugeability of machine parts is concerned.
But
untoleranced conversion problems connected with the
establishment of new standards and new practices
require careful individual study by responsible engineers and organizations.
Therefore, the draftsman
and the designer will be well advised in such cases to
consult the decision-making authority concerned.
4.5
Standard
Feature
metric bolts, nuts and the related tools become
available, it would not be desirable to convert the
dimensions of inch-based screw threads, though
the depths of tapped holes may be converted.
Whether the length of a bolt or the thickness of a
nut is to be converted or not will depend upon
whether it is to be specially produced or bought
ready-made
as a standard part.
On the other
hand, when the metric standards for screw threads
together with those for parts and tools do become
available, then the Q inch bolt should be promptly
replaced by an appropriate bolt from the metric
standard series. But the metric bolt will not
be interchangeable
with the # in bolt.
Similar
remarks apply to gear teeth for gears and splines
for splined shafts where standard gears, splines
and their cutters are involved.
Wires, sheets,
I-beams, angles, etc, present the same picture.
Thus the rules to be followed are given as follows.
4.5.1 Rules for Slaradard I;Eatr!re I%~ttsions
RULE 14 - Standard feature dimensions
shall not be converted unless standards based
on the new set of units are available, in which
case follow Rule 15. When unconverted standard feature dimensions
are retained on a
drawing which has otherwise been fienerally
converted to a new set of units, such dimensions shall be enclosed in a rectangle.
RULE 15 - When alternate standards based
on the system
of units to which standard
feature dimensions
are required to be converted are available, these features shall be _
replaced by features of the appropriate. siti
selected from the relevant standards, and all
the associated
dimensions
affected, by this
choice shall be appropriately adjusted.
Dimensions
4.5.0 Conversion
of dimensions
of standard
features as defined under 2.1.1 has been dealt
with in some detail in IS : 787-1956 under Dimensional Designations, which may either be standarIt has been recommended
dized or non-standard.
in that standard that the former need not be converted, while the latter should be converted
according to rules. For a closer study, reference
is invited to IS : 787-1956.
For the purpose of this standard,
it should
suffice to point out that standard feature dimensions given in inches can only be converted when
features of the same approsimate
size have been
standardized in metric units and the actual standard machine parts to which these features pertain
become generally available for use. Also, as a
corollary, small tools required for the production
of the parts should be available.
In the meantime,
there need be no objection to continue to use the
inch-based standard parts and inch-based standard
tools required to machine the standard features
in question.
It should, however, be noted that
the standard features which are converted will
not be dimensionally
interchangeable
with the
original features.
An example will make the meaning clear. A
drawing may require the use of a 3 in Whitworth
bolt to fit into a tapped hole. Conversion of 8 in
dimension to millimetre, or for that matter the
conversion of detailed dimensions of the screw
thread on a $ in bolt, would be futile and unnecessary, because the bolt of the required size
can only be bought in the market when it is specified in terms of its inch dimensions.
Nor is it
practical to convert the dimensions of the screw
thread i.n the tapped hole, for it has not only to
mate with the Q in bolt but also requires an appropriate tap to cut it and this tap cannot be specified
in millimetre dimensions.
Thus, until standards
on metric threads, together with standards for
Example 10 -By
way of example, it would be
useful to list some of the standard features which,
in the Indian context of 1957, need not be converted
immediately to metric sizes ( Rule 14), but as and
when Indian Standards for such features and for
materials, parts and tools based on such features
become available, they may be replaced by the
appropriately selected metric features from among
those covered by the new Indian Standards ( Rule
15 ) Such a list is given below:
a) Screw Threads
b) Gear Teeth
c) Involute Sp!ines ( Straight splines may be
converted )
d) Sheet and Wire Gauges
e) Standard Rolled Sections of Metals Including
Structural
Steel Sections
It is obvious that from time to time certain of
the above items will be removed from the purview
of Rule 14 and come under Rule 15. If the Union
Parliament
Act on Standards
of Weights and
Measures were strictly interpreted, all such items
should come under Rule 15 within ten years of its
adoption, that is, by December 1966.
11
TABLE .IIIB
INCHES
Range:
TO MILLIbWIltES
( EXACT
)
O-001 to la-in
(Clauses 3.4 and 4.1 )
Inches+
om1
O-092
mm
mm
0405
0404
0405
O-WI6
O-007
mm
mm
mm
mm
mm
O-101 6
O-127 0
o-152 4
0408
0409
0.177 a
O-203 2
O-228 6
o”w64
o-660 4
o-914 4
l-168 4
0.431 8
O-685 8
o-939 8
1.193 8
o-457
0.711
o-965
1.219
2
2
2
2
o-482 6
8:X
l-244 6
i
2:
0
0
o-025 4
0.050 8
0.01
0.02
0.03
0.04
O-254 0
O-508 0
0.762 0
l-016 0
0.279 4
o-533 4
0.787 4
l*o414
0.304
0.558
0.812
1.066
0.05
l-210 0
1.295 4
l-320 8
1.346 2
l-371 6
l-397 0
1422 4
1.147 a
1.473 2
l-498 6
0.06
0.07
0.08
0.09
::% i?
1.549 4
l-803 4
2432 0
2.286 0
z::
1.574
1.828
2.082
2.336
16oo2
1.854 2
2.108 2
2.362 2
1.625
l-879
2.133
2.387
6
6
6
6
::kZ :
2.159 0
2-413 0
1.676
l-930
l-184
2.438
1.701
I.955
2.209
2463
l-727
1.981
2.235
2.489
l-752
2.006
2-260
2514
o-10
2-540 0
2.565 4
2.590 8
2-616 2
2.641 6
2667 0
2.692 4
2.717 8
2.743 2
2-768 6
0.11
0*x2
o-13
o-14
2-794 0
3-0480
2-819 4
3.073 4
:::z
2.870
3.124
3.378
3.632
2.895
3.149
3.403
3-655
6
6
6
6
29210
3.175 0
3-429 0
3-683 0
2.946
3.200
3.454
3.708
2.971
3.225
3.479
3.533
2.997
3.251
3.505
3.759
2
2
2
2
3.022 6
:::Zi
2.844
3.098
3.352
3.606
o-15
3.810 0
3.835 4
3.860 8
3.886 2
3-911 6
3.937 0
3.962 4
3.987 S
4.013 2
4.038 6
0.16
0.17
O-18
0.19
4.0640
4.318 0
4-572 0
4.826 0
4.089 4
4.343 4
4.114 a
4.140
4.394
4.648
4.902
4.165
4.419
4-673
4.927
4-1910
4.216 4
4.470 4
t’;;:
4.292 6
8
5Q800
“5’:::
8
i&42;
t:;;:
4
:
;
8
8
8
8
8
8
a
8
8
8
8
8
::z
i
4.876 8
2
2
2
2
2
2
2
2
6
6
6
6
tz:
4.953 0
d:Fi
4
4
4
4
4
4
4
4
a
8
8
S
8
8
8
S
t
4*i49 8
5Go3 8
4-267
4.521
4.775
5.029
;
2
2
2
2
3:::: t
3.784 6
2
2
2
2
::z:
5.054 6
S-308 6
5.130 8
5.156 2
5.181 6
s-207 0
5.232 4
5-257 8
5.283 2
:-:i;t t
5i92 8
6.146 8
S-41012
5.664 2
S-918 2
6.172 2
5.435 6
S-689 6
5.943 6
6.197 6
.
:~~x
s-969 0
6.223 0
5486 4
5.740 4
5-99-)4
6*2+S 4
5.511
5.765
6.019
6.253
s-537 2
5.791 2
6+I45 2
6.299 2
8
8
8
8
6
6
6
6
F
TABLE
IIIB
INCHES
Range
TO
MILLIMiWRBB
( EXACT
) -
tl..
Coritd
E
t
: Oool to l-091) im
,
hChC?S+
0
o-e01
0902
0.003
mm
mm
0404
oao7
0.008
0909
mm
mm
mm
mm
6MO 8
6527 8
6.5532
6.5786
6.6548
6.7818
7.0358
7.2898’
7.5438
6*X072
7.0612
7.3152
7.5692
Gif f
7.3406
7.5946
7.797 s
7.8232
7.848‘i
840518
8.3058
8.5598
8r8138
8.077 2
8.3312
8.585 2
8.8392
8.1026
8.3566
8.6106
8.8646
9.0678
9.093 2.
4
mm
0.25
06350 0
64WO
6.3754
0.41
;:u”
6.44
o.oo,mm
mm
“13:: 8
7.3660
f*K t
7:1374
7.3914
;::i
t
7.41.68
7aO 0
7.6454
7.6708
7.6% 2
7.7216
7.7470
7.8740
8.1280
8.3820
8.6360
7.8994
7.9248
ant
86614
if::: :
816868
7.9502
8.2042
8.4582
8.7122
7.9756
8.2296
8483 6
8.7376
z2:
8iO90
8.8900
8.9154
8+4438
8.9662
8.9916
9917 0
9.1948
X:iZ t
9.9568
9.2202
9.4742
9.7242
9.9822
9.2456
9.4996
9.7536
10.0076
9,27lO
9525 0
9.7790
10033 0
10.2108
10.2362
::z
9652 0
9-9060
0.10
1
1@1600
10.1854
10.4394
if.176 0
104220
:X:Z ::
11*2014
:t:::
. t i
10.9728
11.2268
11430 0
11.4554
11.4808
::zx
:::z:
12.2174
12.4714
KG
88
12.2428
12.4968
::zi
i2a:
:
7’1724
8.7630
9.0424
9.1186
10.0584
9.3218
9.5758
9.8298
10.0838
9.3472
9.6012
9.8552
10.1092
9.3726
9.6266
9.8806
IO.1346
10.2616
10.3124
10.3378
10.3632
lo-388 6
10.4902
10.7442
10.9982
11.2522
10.5156
10.7696
11.0236
11.2776
:si
:
llQ744
11.3284
:~:z: ii
11.0998
11.3538
10.6172
10.8712
11.1252
11.3792
10.6426
10.8% 6
11.1506
llM46
11.5061
11.5316
11~5570
11.5824
11.6078
11.6332
11.6586
11.7602
11.7856
12.0396
12.2936
12.5476
11.811.O
11.8618
12.1158
12.3698
12.6238
11.8872
11.9126
::zts
12.3444
12.5984
:22:::: f
12.6492
K
t
12:6746
KY:: 3
12.5222
.
:f%
8
125730
X:%
:
9.8044
s
3
TABLE
IIIB
INCHES
TO MILIJMETRES
Range:
Inches+
4.
0
0.004
o4Jo3
O-002
Contd
to 1400 in
0.005
O+tO6’
0-007
O-008
oao9
-mm
0*50
o-001
WOl
( EXACT ) -
12.7000
mm
mm
12.7254
12.7508
o-51
0.52
12.9794
g*g;;
“o:Z
13.7414
mm
mm
inm
mm
mm
mm
mm
12.7762
12.8016
12.8270
12.8524
12.8778
12.9032
12.9286
:::z
:
13.5890
13.8430
:;:::
t
13.6144
13.8684
13.1318
13.3858
13.6398
13.8938
13.1572
::z:‘:
13.9192
:::x: f
13.6906
13.9446
14.0970
14.1224
14.1478
14.1732
14.1986
14.3510
14.3764
14.6304
144018
14.6558
14+X@8
15.1638
14.4272
146812
14.9352
15.1892
:f:g
2
14.9606
15.2146
13.0302
::::i‘i;
13.7922
14.0716
13.9700
13.9954
14.0208
14.0462
14.2240
:t:3:: :
14.9860
14.2494
14.5034
14.7574
150114
14,2748
14.5288
ii
14.3002
14554 2
14.8082
15*%2 2
0.60
15440 0
15.2654
15.2908
15.3162
15.3416
15367.0
15.4178
15.4432
15468 6
0.61
0.62
0.63
0.64
:::;Zi 00
16.0020
16.2560
15519 4
15.7734
16.0274
16.2814
:::;:
t
16.0528
16.3068
::*;15 f
16:0?82
16.3322
i ::z
z
16.1036
16.3576
15.6210
15.8750
16.1290
16.3830
15.6718
15.697 2
15.9512
16.2052
16.4592
:::;K ::
16.2306
16.4846
0.65
16.5100
16.5354
16.5608
16.5862
16.6116
16.6370
16.6624
16.7132
16.7386
0.66
0.67
0.68
0.69
16.7640
17.0180
17.2720
17.5260
16.7834
17.0434
17.2974
17.5514
16.8148
16.8656
:::Ki t
17.5768
16.8402
17.0942
K
:::::I: 2
17.6276
:z::
t
17.3990
17.6530
16.9164
17.1704
17.4244
17.6784
16.%7 2
17221 2
17.4752
17.7292
:;:ZZ t
17~5006
17.7546
0.70
17.7800
17.8054
17.8308
17.8562
17.8816
17907 0
17.9324
17.9578
17.9832
18.0086
t;
0.71
0.72
0.73
0,74
:::;ii 0”
18.5420
18.7960
18.0594
18.3134
18.5674
18.8214
18.0848
18.3388
:i:::
;
18.6182
18.8722
18.1356
1.8.3896
18643 6
18.8976
18.1610
18.4150
18.6690
18.9230
:ft:iZ:
18.6944
18948 4
:::z:
t
18.7198
18.9738
18.2372
18.4912
18.7452
18.9992
18.2626
18.5166
18.7706
19.0246
:
g
7
:::z:
:“B:z
t
:::z
:t:tZ; 8
15.1130
:::;ii:
:z:
t
16.4338
s’.
3
TABLE
ILIB
INCHES
TO MILLIMETBES
Range:
( EXACT
) -
t;
..
COW
E
Ml01 to l-000 in
0
H
I
Iache8+
4
_
0.001
0=002
O-003
0-004
oao5
oQo6
mm
mm
0.75
19.0500
19.0754
19.1008
19.1262
19.1516
19.1770
19m24
0.76
0.77
0.78
0.79
19.3040
19.5580
19.8120
20.0660
19.3294
19.5834
19.8374
20.0914
19.3548
19.6088
19.8628
20.1168
19.3802
19.6342
19.8882
20.1422
19.4056
19.6596
19.9136
20.1676
19.4310
194564
:~~~; 8
2Oi93 0
oao
20.3200
20.3454
20.3708
20.3% 2
20.4216
0.81
0.82
0.83
0.84
20.5740
;Kz
0”
21.3360
20.5994
20.8534
21.1074
21.3614
20.6248
20.8788
21.1328
21.3868
0.85
21590 0
21.6154
21.6408
0.86
0.87
ii::
21.8440
22.0980
22.3520
22.6060
21.8694
22.1234
22.3774
22.6314
i::;:
t
22402 8
22.6568
040
22.8600
22.8854
22.9108
;:‘:G:
23:6220
23.8760
23.1394
23.3934
23.6474
23.9014
;:::?i t
23.6728
23.9268
24.1300
24.1554
24.1808
24.3840
24.4094
;z~
:
25446 0
z::
:
25.1714
;;;
t:z
0-009
-_mm
0.91
0.92
0908
O-007
2!i4000
24-4348
24.6888
24942 8
25.1% 8
21.6662
19.2532
:zft
20.2184
:z:
:
19.9898
20.2438
:‘6;z t
20& 2
20.2692
20447 0
20472 4
20.4978
20.5232
20.5486
20.6756
20.7010
20.7518
20.7772
i!?;; 2
21:4376
i:z
8
21463 0
20-7264
20980 4
21.2344
21488 4
Kit;
t
21.5138
;::ii:
;
21.5392
‘EE
f
1.3106
if’
21.5646
21.6916
21.7170
21.7424
21.7678
21.7932
21.8186
21996 4
22-2504
22*5044
22.7584
22.0218
;::;z
z
22-7838
21.9456
iz6”
22.7076
22.9616
22.9870
23.0124
23.0378
23.2410
23.3172
;::;:i 8
24.0030
23.2664
23.5204
23.7744
24.0254
23.2918
23.6982
23.9522
iz:
f
23.7236
23-9776
43”:;: t
24.0538
x
2’
241)792
24.2062
24231 6
24.2570
24.2824
24-3078
24.3332
24460 2
24.7142
24.4856
;::;i: 8
25.0190
25.2730
24.5364
24.7904
25a4 4
25.2984
22.9362
;:z:
Z:Z
:
19.2786
19227 8
zz3’ t
25.2476
23.0632
5;
3
IS : 1105- 1957
TABLE
IIIC
INCHES
TO
MILLIMETRES
( EXACT
)
WOO0 01 to O-00100 in
Range:
( Clattses 3.4 and 4.1 )
lmm
in
in
0400 01
0aOO 02
OWO 03
0aOO 04
0400
omO
0*000
0mO
51
52
53
54
0aOO 05
O@Ol 270
0mO 55
0.013 970
OGIO 06
0.000 07
0aOO OS
o@OO 09
0001 524
O*OOl778
oaO2 032
om2 286
0000 56
0alO 57
OGOO58
OaOO 59
“o:oo:: z7;:
()+I+ 732
0~014 986
oaoo 10
oaO2 540
OWO 60
0.015 2+0
OaOO 11
0000 12
o@Oo 13
OaOa 14
O-002 794
om3 048
O+Kl3302
O+lO3556
OdJOO
61
O@OO62
0.000 63
(i~OOO
64
0.015
0.015
0.016
0.016
0aOO 15
oaO3 810
OWO 65
O-016 510
8:i% :t
o@OO 18
omO 19
8:iiz %
0.004 572
OW4 826
0aOo
OmO
OWO
OWO
66
67
68
69
0.017 272
0.017 526
0aOO 20
OX@5 080
oaOO 70
0.017 780
o*ooo 2 1
Z:% 2:
OWO 24
ems
o@Os
OW5
0.006
334
588
842
096
o@OO 71
0.000 72
0400 73
0.000 74
0.000 25
0.006 350
0000 75
8’%!
$g
OGOO76
OGOO77
f;
::!!Z
3:
o*oOO30
0.007 620
OGOO80
0mO 31
0*007 874
O-008 128
OGOO81
OGOO82
O-000 83
O-000 84
::tii 3332
OaOO 34
8:iit
%
494
748
002
256
::::4;z
0.019 050
:::;z ::
0.019 812
0.020 060
0.020 320
omO 35
0.008 890
OGOO85
it%
334
0-000 38
0aOO 39
8’zx
OiO9 652
O-009 906
OaOO 86
O@OO87
OaO 88
3GOO 89
oaOo 40
0.010 160
0mO 90
oGOO 41
0mO 42
OaOO 43
o@OO 44
0.010 414
0.010 668
0*000 91
OaOO 92
0*000 93
o@OO 94
.0*023 622
0.023 876
o*ogO 45
0.011 430
OWO 46
0*000 47
0aOO 48
oaO 49
O-000 50
8%
?E
8%
8.i
xi::
iii
O-012 700
8:::: :i
oaxl95
O-024 130
OGOO96
0aOO 97
OGOO98
OaOO 99
0.024 384
O-024 638
O-024 892
0.025 146
O*OOl00
0.025 400
IS : 1105- 1957
TABLE
IIID
COMMON
FRACTIONS
OF INCHES
TO MILLIMETRES
Ran&e: & to 1 in
( Clauses 3.4 and 4.1 )
Inchea
Decimal
Inch
Millimetree
Inch-
Decimal Inch
0.015 625
0.031 250
0.046 875
o-062 500
13.096 875
13.493 750
13.890 625
1.587 500
O-078 125
o-093 750
o-109 37.5
0.562 SO0
14.287 500
0.578 125
0.593 750
0.609 375
14.684 375
15.081 250
15.478 125
o-125 000
3:175 000
fi.625 000
15.875 000
O-140 625
3.571 875
3.968 750
4.365 625
0640 625
0.656 250
0.671 875
16.271 875
;f66; ;;K&
O-187 500
4.762 500
0.687 500
17462 500
O-203 12.5
5.159 37.5
5.556 250
5.953 12s
0.703 125
0.718 750
0.734 375
17.859 375
18.256 250
18.653 12s
o-250 000
6,350 000
o-750 000
19.050 000
0.265 625
6.746 875
7.143 750
7.540 625
0.765 625
0.781 250
0.796 875
19446 875
19.843 750
20.240 625
7.937 500
0.812 500
20.637 500
0.328 125
0.828 125
X%
zt:;
21.034 375
3; .;3& :;g
i::;:
8::::
::;:i
f3i
if
i::
0.312 500
35’:
3::
9.525 000
0.875 000
22.225 000
9.921 875
10.318 7.50
10.715 625
0.890 625
o-906 250
0.921 875
22.621 875
23.018 750
23415 625
o-437 500
11.112 500
0.937 500
23.812 500
o-453 125
11:509 375
0.953 125
24.209 375
8:Z
::g
8:;;:
i::zi
0.375 OCO
:f
o~soo-000
Nom -All
Mlllimetrea
::i
3;:
1*000000
12*7a 000
figures beyond the six places of decimals given are zeros.
18
::!
25400 000
TABLE
IVA
MILLIIUBTRES
Range:
l.to
0
Mall-
lam mm
3.4 8nd 4.1)
( cbnus
metrem
TO.llWBEt?
2
3
4
5
6
7
8
9
in
in
in
in
in
in
in
in
1
I
in
0
O-039370
O-078740
O-118110
o-157480
0.1% 850
0.236 220
O-275591
0.314961
o-354331
0.393701
0.787402
l-181 102
1.574803
o-433071
O-826772
1.220472
1.614173
O-472441
O-866142
l-259 843
l-653 543
O-511811
O-551181
@590 5.51
O-629921
o-708 661
t:g
:::
l-692 913
Y-~~~
11732283
tz
f::
i771654
:zzi
l-811 024
o-669 291
14x2992
1456 693
1.8503%
::zii z:
l-889 764
O-748032
l-141732
1.535433
l-929 134
1968504
2-007874
2-047244
2-086614
2.125984
2.165354
2.204724
2.244095
2.283465
2.322835
2.5984225
2-637795
2.677 165
3’:: ii!
31779528
zz
tit
3.818898
:ct
3.858268
2.716535
ylf
;a&
.
3-897638
4.212 598
4.251969
4.291339
2-362205
2.755906
:::c
zz
- 2~401575
2.795276
3.188976
3.582677
2440 945
2-480315
:‘8ztz
31622047
i-i;;
3&l
t5
417
2.519685
2.913386
3.307087
3.700787
2.559055
2.952756
4.094488
4.133858
4.173 228
::Zi
:587
loo
3.937008
3.976378
4a5
748
4-055 118
110
4.330709
4.370079
4$09449
4.803 150
4.448 819
4-5275.59
4566 929
::iZ Z
5629 921
:3:: z
51708661
.
:‘zs
5.748032
:ziiitz
5.393701
S-787402
4.645669
5-039370
s-433 071
S-826772
4-685039
S-078740
5472 441
S-866142
6.141732
6.181 102
6.220472
6.2!!9842
6.574803
6-968504
7-362205
7.755906
6.614 173
6-653543
cz
f;!
7.795276
ziz
7.834646
8.149606
8.188976
8.228346
8$61 S67
8.582677
;zxi
:~:~~
91763780
t%Ei
9.409449
ii
:z
ifi
5511811
::::; iii
5551 181
::Zi
wO5 512
5.944882
5984 252
6-023622
6ti2 992
6*102362
6-299213
6-692913
6.338583
;s
ii:
!Z
6.377953
6417 323
6-4s 693
64% 063
.
5’;iz
7.519685
fC:
i;
71559055
.
t-z:
7.598425
.
~~~
7.63779s
!-~~~
7&
165
7913 386
7952 756
7992’126
8.307087
8346 457
zxi
948a 189
t’~~~
k7
s59
8+70866
8.858268
8.110236
9-803150
TABLE
IVA
IUILLIMETBES
Rsnge:
TO .INCHES -
E
..
Cd
z
t
1 to lO@O mm
I
Millimetres+
4
2
3
5
6
7
8
9
in
in
in
in
in
in
4
--
in
in
in
in
9.842520
9.881890
9.921260
9.960629
1oam-J000
10.039370
104x8 740
10.118110
10.157480
10.1% 850
10.275591
10.669291
11-062992
11.456693
10.314961
10.708661
1l-102 362
11.496063
IO.354330
10.748031
11-141732
11.535433
10.393701
10.787402
;;*;g lg
10.433071
10472 441
z
10.236220
IO.629921
11-023622
11417 323
:::::
Zf
11.614173
:PKz
l&53
543
10*511811
lo+05 512
11.299213
11.692913
10*551181
10944 882
11.338583
11.732284
1oaO 551
xl.984 252
11.377953
11.771654
300
11.811024
11.850394
11.889764
11.929134
11*%8 504
12aI7 874
12017 244
12.086614
12.125984
12165 354
310
12.204724
12.598425
12992 126
13.385827
12.244094
12.637895
13.031596
13.425297
12.28346s
12.677165
13.070866
13464 567
12.322835
12.716535
13.110236
13.503937
12.362205
12.755906
12401 575
::.;g 27g
12440 945
12.834646
12.519685
12.913386
12*559055
::::;
13:582677
:::z:
12480 315
12.874016
;;.26; ;;;
13.858268
13.897638
13937 008
13976 378
14.015748
1+055 118
14.094488
14.133858
14488 189
14.881890
15.275591
15.669291
:::E: z
15.708661
2M
z
E
i
Z
g
:::;g
Z
::::z Z
13.740158
350
13.779528
13.818998
360
370
390
14.173228
14.566929
14.960630
15.354331
14.212698
14606 399
15aOOooo
15.393701
14.251968
14645 669
15.039370
15.433071
14.291339
14.685039
1’5.078740
15.472440
14.330709
14.724409
15*118110
15*511811
:44:z !G
15.157480
15~551181
:4:g Z
15.1% 850
15.590551
14.448819
14.842520
15.236220
15.629921
P
15.748032
15.787402
15.826772
15.866142
15+05 512
15944 882
15+84 252
16.023622
16.062992
16*102362
410
z
44e
16.141732
16.535433
16.929134
17a22 835
16.181102
16*57$803
16.968504
17.362205
16.220472
16.614173
17.007874
17401 575
M.259 842
16.653543
17.047244
17440945
16.299213
16-692913
17.086614
17480 315
16.338583
y;g
g
16417 323
16.811024
17.204724
17.598425
16.456693
16.850394
17.244094
17.637795
164% 063
16.889764
17*519685
16.377953
16.771654
17.165354
17.559055
4!l0
17.716535
17.755906
17.795276
17.834646
17.874016
17,913386
17~~52756
17992 126
18.0314%
18@70866
460
410
18.110236
18.503937
18.897638
19.291339
18.149607
18,543307
18.188.976
18.582677
18-976378
19.370079
18.267716
18661417
19.055118
19448 819
:::;g z;
19.094488
19488 189
:;*;z ::8’
191133858
19.527559
18.385827
18.779528
18.425197
l&818 898
19.212598
19606 299
18464 567
z
::9:;
Z
:;:g
Z!
14.527559
:3zz
.
:z:‘:
z
19.645669
s
s
TABLE
~METlti&
TO lNUiES
- Conk2
Raage:ltmoo&
0
1
2
3
4
5
6
7
a
in
in
in
in
in
in.
in
in
in
19.724 409
19.763 780
19.803 150
19*a42 520
19.881 8%
19.921 260
19960 630
2odJoo WJO
20.039 370
20.118 if0
20*511811
20.905 512
21.299 213
20.157
20.551
20944
21.338
g27;
20.314 961
2O.708 661
;yg
36;
20.354
20.748
21.141
21.535
20.393
20.787
21.181
21.574
20.433
20.826
21.220
21.614
21.692 913
21.732 284
21.771654
22.086
22.480
22.874
23.267
22.125
22.519
22.913
23.307
984
685
386
087
22.165 354
22.559 055
g.92
gJ
21.653 543
614
315
016
716
480
181
882
583
;;;
331
032
732
433
9
in
701
402
102
803
071
772
472
173
EzE
21023 622
21417 323
21.o62 992
21456 693
21-811 o24
21.850 394
21.889 764
21.929 134
21.968 SO4
22607 874
E:Z
I;:
22992 126
23.385 a27
E:ZZ Z
234314%
23.425 197
22.283
22.677
23.070
23464
22.322
22.7f6
23-l 10
23.503
22.362 205
22*4o1575
y5&
L??Z
465
165
866
567
835
535
236
937
;:zJ
E
23:543 307
23.582 677
23.622 047
23.661417
23.700 787
23.740 158
23.779 528
23.818 sb8
23.858 268
23.897 638
23.917 008
23-976 378
24-015 748
24dO9 449
24.055
24448
24.842
25.236
118
819
520
220
24.094 488
24.488 189
24.881890
25.275 591
24.133
24.527
24.921
25.314
24.173 228
24.566 929
24.212 598
24.606 299
25WlOOO
25.393 701
24.251
24645
25439
25.433
968
669
370
071
24.291 339
;:‘g
;g
703
409
110
811
24.370 079
;fl’x;
g
25.472 441
24-330
24.724
25.118
25.511
25,590 551
25.629 921
25669 291
25.787 402
25.826 772
25.866 142
25.905 512
25944 882
25.984
26.377
26.771
27.165
252
953
654
354
26.023 622
26-417 323
26.811024
27*2O4 724
26G62
26.456
26.850
27.244
26.181
26.574
26.968
27.362
g.;g
26.259 842
26.653 543
26.299 213
26.692 913
27.086 614
27-4aO 315
26.338 583
27.559 055
27.598 425
27.637 795
27.952
28.346
28.740
29.133
27.992
28.385
28.779
29.173
28.0314%
28425 197
gmf
wf&
ZE
E
756
457
158
858
126
827
528
228
858
559
260
961
ZZ
:iY
25.748 032
992
693
394
094
27.677 165
102
803
so4
205
27.755 906
28-l 10 236
28.503 937
~~
ii0
ZZ
iii!!
28.937 ooa
29.330 709
;;:
25.551 la1
E-z
z
27:519.6as
27.007 874
27.401 575
zz
27.795 276
27.834 646
27.874 016
27.913 386
28.188 976
E’58; fi;;
28.228
28.622
29.015
294O9
28.267 716
28.661417
;;.os$ ;l;
28.307
28.700
29.094
29.488
29:370 079
E
346
047
748
449
Oa7
787
4a8
la9
TABLE.
WA
MILLIMETRES
Range:
Milllmetresd
-- +
.-
0
1
__-.
-__.__.--..
-___
in
in
2
TO INCHES
-
1 to 1 000 mm
5
3
6
_
in
in
Codd
in
--_
7
8
9
-
in
in
in
in
in
29.527559
29.566929
29606 299
29.645669
29.685039
29.724409
29.763780
29.803150
29.842520
29881890
29.921260
BO.31.l061
3O~iOX661
31.102362
29.960630
30.35-I331
30.7+5032
31.141732
3oaO m
30.393701
30.787402
31.181102
30.039370
30.433071
30.826772
31.220472
30.078740
30.472441
30.866142
31.259842
30-118110
30511 811
30905 512
31.299213
30.157480
3O~SCl181
30.944RX2
31.338583
30.196850
30.5905.51
30984 252
31.377953
30.236220
30.629921
31.023622
31.417323
30.275591
30669 291
31.062992
31.456693
800
31.4% 063
31.535433
31.574803
31.614173
31.653543
31.692913
31.732284
31.771654
31.811024
31.850394
810
820
31.889764
32.283465
32.677165
33.070866
31-929134
32.322835
32.716535
33.110236
31.968504
32.362205
32.755906
33.149606
32.01’7874
32401 575
32.795276
33.188976
32.047244
32440 945
32.834646
3X.228346
32.086614
32.480315
32.874016
33.267716
32.125984
32519 685
32.913386
33.307087
32.165354
32.559055
32.9527.56
33.346457
32.204724
32.598425
32992 126
33.385827
32.244094
32.637795
33.031456
33.4225
197
33464 567
33.503937
33.543307
33.582677
33.622047
33.661417
33.700787
33.740158
33.779528
33.818898
;:G;
:::;z
zz
34.724109
35.118110
33.976378
34.370079
34.363780
35.15;7480
34.015748
34409 449
34.803150
35.1% 850
34.055118
34448 819
34.842520
35.236220
34.094488
3ttt: iti
35.275591
34.133858
34.527559
34.921260
35.314961
34.173228
34.566929
34960 630
35.354331
34.212598
34.645669
35.039370
33.897638
34.291339
34.685039
35.078740
:::Ei z
35.393701
900
35.433071
35.472441
35.511811
35.551181
35*590551
35.629921
35669 291
35.708661
35.748032
35.787402
910
920
35.866142
36.259842
36.653543
37.047244
:::g
;::
36.692913
37.086614
3w44 882
36.338583
36.732284
37.125984
35.984252
36.3779.53
36.771654’
37.165354
36.023622
36.417323
36.811024
37.201724
36.062992
36.456693
36.850394
37.244094
;ty;
z
35.826172
36.220472
36.614173
37.007874
36#?9 764
37.283465
36.141732
36.535433
36.929134
37.322835
3k.181102
36.574803
36.968504
37.362205
950
37401.575
37.440945
37.480315
37.55905.5
37.598425
37.637795
37.677165
37.716535
37.755906
960
;‘s?:
37.834646
38:582677
38.976378
37.952756
38.3464.57
38.740158
39.133858
37992 126
38.385827
38.779528
39.173228
38.031496
38.425197
38.818898
39.212598
38.070866
38.464567
38.110236
38.503937
38.897638
39.291339
38.149606
;p;
g
g
990
37.874016
38.267716
38661417
39.055118
low
z
g7;
39.370OP
:8”‘:;: &Y
39:015748
36;
39.330IO9
TABLE
IVB
MILLIMETRES
Range:
O+Wl to 1W
TO
INCHES
mm
( Clauses 3.4 and 4.1 )
Millimetres+
-. 4 -
l-
l-
I
in
0
_..
-
in
__
0
OmO 433
OGOO827
OdxJl 220
OdOl 614
0~001968
0.002 008
0%
0.07
0.08
0.09
OW2 362
0*002 7%
WOO3150
om3 543
8:c% $5
0.003 189
0.003 582
om2
0.002
om3
0.003
0.10
OGO3 937
@003 976
OW4 016
0.05
O@OO472
omo 866
0.001 260
OdIO16.54
0@05 9t5
0.15
0.16
0.17
0.18
0.19
::%z :9d:
0.007 087
0.007 480
0,006 339
0006 732
OXJO 126
0*007 520
00X
984
;:E
0.008 268
O-008 661
O-009 055
OmY 449
cwO8 307
0~008 701
0mY OY4
OGOY488
-.----_
--in
O-007
0406
in
__.-
in
in
OGOO118
0000 157
0GoO 197
0,000 236
oaoo276
0mO 512
O-o00906
po;
;;;
0-000 551
OGOO945
O+Ol 330
OdJOl732
o*OOO591
0aixl9~4
0.001 37s
0.001752
0.000 630
“SE
0.001457
0+02 126
0@02 165
0.002 205
om2
om2
Om2
cw3
oal3
ow2
0.002
0+03
om3
559
953
346
740
0.002 598
0.002 992
0@03 386
0*003 780
O.o(i2 638
0.003 031
0.003 425
0.003 819
134
w_m 173
520
913
307
: 01
oGO4 05 5
o*cc+
cY4
om4
c.004
ow4
Ow5
OUI5
449
843
236
630
ow4 48s
oaI4 882
WOOS276
OWS 669
o+xki 528
Om4 Y21
0~005 31;
ww5 709
om6 024
OW6 003
if%: ::‘:
wlO1 811
0.004 252
O-006 220
“o:E ;::
oGO7 205
0.007 598
0~006 496
WOO6890
wo7 2s.7
0~007 677
wmi 575
cw6 W8
WJO7 362
WOO7756
0.007 Y92
OGO8032
WI08 05 1
OWS 346
;.g
;$
OGO8 386
0+08 780
0.009 528
8:%
o@Os 425
0cOY’819
0.009’213
0.0119606
OGOS465
o@x t;sfi
WWY 252
ow9 646
:::
I
i
h
0.002 323
om2 717
om3 110
0.003 504
OGO.1898
0.004 646
0~005 039
OWS 433
O*OOS
827
0006 181
I
0@02 283
OdH4 213
wx6
IboO
OW7
0.007
0.000354
oM)o 748
O@Ol 142
0~1.535
0*001929
w-m 6%
O-005 Ooo
0w5 3Y4
O-O05787
OW6 142
378
772
165
559
Omo 315
244
WO6 10’
WI06
0036
OW7
00IJ7
in
0+01850
157
850
244
638
535
YZY
323
717
O-009
O-008
____A
in
WW6
OW6
OW7
WO7
0.20
0.21
0.22
___~
441
835
228
622
0.11
o-12
0.13
0.14
0685
oaw4
in
in
OGOO394
0aOa 787
om1 181
0401 575
0.01
0.02
0.03
0.04
g
oao3
0
0.004 291
O-006 260
00X
0.007
om7
0.007
654
047
441
835
0.308 110
om8
150
0.008 189
OXNI8228
OQOSSO4
OGO3 SY$
uw3 2Yl
0~009 685
Oa
ow8
0.009
0.009
543
937
331
724
0.008
0.008
OmY
OmY
0@08 622
OWY 016
OwY409
WOY 803
I-
583
976
370
764
._
TABLE
IVB
MILLIMETBEB
Ihuge:
Mull-
TO IN&ES
0431 to 143
-
CmUd
mm
e
0431
o-002
O-303
0404
O-003
in
in
in
in
in
in
in
in
in
in
0409 843
0.009 881
O-009921
0.010000
0.010039
o-010079
O-010118
0.010 157
0.010 197
O-010276
o-010 669
O-011063
O-011457
0.010 315
0.010709
p; ; ;g
O-010394
O-010433
0.010 512
E!:: :t:
o-011 575
XZ IZ
O-011 614
O&O 472
O-010866
O-011260
0.011654
8::: E
O-011693
O-010551
o-010 945
0.011 339
O-011732
O*OlO591
O-010984
0.011378
0.011772
0.011968
0.012047
O-012087
0.012 126
0.012165
8’::; 3;;
;jl;
$
o-012 441
0.012834
O-013228
O-013 622
XE :,I:
O-013268
o-013 661
0.012 520
0.012 913
o-013 307
0.013 701
O-012559
o-012953
0.014016
O-014055
O-014094
0.014 134
~:~~
Oa15 236
O-015 630
0.014488
O-014882
O-015 276
O-015 669
0.014 528
0.014921
o-015 315
O-015708
OW
0Qos
0409
metree+
3
g
MO
oa1811
0@11850
o-011890
O-011929
0.31
0.32
0.33
0.34
0.012205
0.012598
O-012992
0.013 386
O-012244
0.012638
0.012323
0.012717
8Z3 Et
0.012283
0:012677
o-013 071
o-013 465
043
o-013780
0.013819
0.013858
0.013898
ON3 937
o-013976
:z
0133
0.39
0.014 173
0.014 567
O-014%l
0.015 354
O-014213
o-014 606
0.015000
O-015394
0.014252
0.014646
0-01s 039
0.015433
0.014291
O-014685
0.015079
O-015 472
o-014 331
O-014724
o-01.5118
o-015 512
O-014370
049
0.015787
O-015827
0.015866
O-015906
O-015984
CKU6 024
0.016063
0.016 102
041
042
0.016220
0016 260
8’8;$65;
::z
0.016 181
0.016 575
0.016968
0.017362
O-017441
“d”bizE
0017 087
O-017480
E:8 Et!
0.017 165
O-017559
EE ;L::
0.017205
0017 598
O-016457
O-016850
.0.017244
O-017638
88:: :zz
01017283
0.017677
043
O-017756
0.017795
O-017835
O-017874
O-017953
o-017992
O-018032
O-Ol8071
8::: ::;
0.018976
o-019370
O-018228
O-018622
O-019016
O-019409
O-018346
O-018386
GE!
Et
:tt
O-019567
0018 425
0.018819
O-019213
0.019606
O-018465
O-018858
0.019252
o-019646
z
043
049
-- ,
0.018 150
,O-Q18543
Et
:::
z-8:4 E
01017402
88:33:z
Ef
E
019 055
O-019449
8:X;: ::
O-015551
O-019
528
8:Z
E
TABLE IVB MILLIMETRES
TO INCHES-Cod
Range:OM)l to 1400 mm
0
0401
in
in
0@19685
O-005
0404
in
in
in
0.019
724
0.019
764
0.019
803
Oa19843
8::;:::;
0.020866
o-On26O
0.020
118
0.020
512
0.020
906
0.021
299
0*020157
0*020551
0.020945
0.021
339
0.020197
0.020
591
0.020984
0.021
378
0421654
0.021693
0.021
732
0.022047
o-022441
OX&!2835
M)23228
0.022
087
O-60
Milli-
met-
0*002
oa05
0406
0407
0408
0409
4
in
in
in
in
0.019882
0~019921
0.019961
oa2oO0O
O.020039
0.020
236
0.020630
0.021
024
O.021417
0.020276
0.020669
0.021
063
0.021
457
O-020
315
0*020
7O9
0.021
102
0.021
496
0.020354
0.020
748
0.021
142
O-021
535
0620394
0.020787
0.021
181
0.021
575
0.020433
O-020827
0.021
220
O*OJl
614
0.021772
0;021
811
0.021
850
0.021
890
0.021
929
0.021968
0.022008
X:Ztt
0.023
267
0.022
126
0.022
520
0.022
913
0.023
307
0.022
165
0.022
559
0.022
953
0.023
346
0.022
205
0.022
598
0.022
992
0.023
366
0.022
244
0.022
638
0.023
032
0.023
425
0.022
283
0.022
677
0.023
071
0.023
465
0.022
323
0.022
717
0.023
110
0.023
SO4
0.022362
0.022756
0.023
150
0.023
543
0.02240
0.02279,
0.023
189
0.023
583
0923622
0423661
0.023
701
0.023
740
0.023
780
O-023
819
0.023
858
0.023
898
0.023
937
0.023
976
o-61
OM4016
0.024094
0.024489
O-64
8:%z
0425197
0.024055
0.024
449
0.024
843
0.025
236
8:x:
0.024134
0.024
528
0.024
921
0.025
315
0.024173
0.024567
0.024
961
0.025
354
0.024213
0.024606
0.025
O00
0.025
394
O-024252
O-024
646
0.025
039
0.025
433
0.024291
0.024
685
0.025
079
0*025
472
0.024
331
O-024724
0.025
118
0.025
512
0.024
370
0.024.76-t
0.025
157
0.025
551
bd!i
oa25 591
0.025
630
0.025
669
0.025
709
OG25 748
0.025
787
0.025
827
0.025
866
0.025
9O$
0.025
945
oa25984
0926378
04X6772
0927165
0.026024
:::z::
0.027
205
0.026063
0.026457
0.026850
0.027
244
0.026
102
0.026496
0.026
890
0.027
283
0826142
0.026
535
0.026
929
OG27323
0.026
181
0.026
575
0,026
968
0.027
362
0.026
220
0.026614
0.027008
0.027402
0,026
260
0.026
654
0.027
047
0.027
441
0.026
299
0.026693
0.027
087
0.027480
t:::::;
0:027126
0.027
520
0.70
0427559
0@27598
0.027638
0.027
677
0.027
717
O-027756
0.027
795
0.027
835
OG27874
0.027913
0.71
0.027
953
0428346
0.028
740
0429134
0927992
0428386
0.028780
0429173
0.028032
O-028425
0.028819
0.029
213
0.028071
O-028465
0.028858
0.029252
0.028
110
0.028
189
0.028
583
0.028
976
0.029
370
0.028
228
0.028
622
0.029016
0.029409
0.028
268
0.028661
0.029
055
0.029449
z
tz
040
0.69
::;:
0.74
x:;z;
0429291
in
tf
..
0.028
307 .=
0.028701
d
0.029
094
O-029488 L
f
/
TABLE IVB MrtLIMETRES
TO INCHES-Corud
Range: OdBOlto 14IOOmm-
0
0301
O-006
oao7
in
in
in
6003
@004
0.003
in
in
O*OOS
0.009
_--_
--
in
0+02
in
in
in
in
0.029528
WO29567
0.029
606
0.029
646
Om9685
0.029
724
0.029
764
0.029
803
O-029
843
0.029
882
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