Is 2473-1975 - Norma Furos de Centro

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    Disclosure to Promote the Right To Information

    Whereas the Parliament of India has set out to provide a practical regime of right to

    information for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,

    and whereas the attached publication of the Bureau of Indian Standards is of particular interest

    to the public, particularly disadvantaged communities and those engaged in the pursuit of

    education and knowledge, the attached public safety standard is made available to promote the

    timely dissemination of this information in an accurate manner to the public.

    !"#$% '(%)

    !"# $ %& #' (")* &" +#,-.Satyanarayan Gangaram Pitroda

    Invent a New India Using Knowledge

    /0)"1 &2 324 #' 5 *)6Jawaharlal Nehru

    Step Out From the Old to the New

    7"#1&"8+9&"), 7:1&"8+9&")Mazdoor Kisan Shakti Sangathan

    The Right to Information, The Right to Live

    !"# %& ;

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    :389-W

    Fourth Reprint NOVEMBER 1991

    ( IncorPoratina

    4s : 2413 -

    mendment

    r z

    o.

    1

    1 (R-=-d

    19781

    Indan Sandard

    DIMENSIONS FOR CENTRE HOLES

    Frst Revision

    Scope - Prescribes dimensions for the,following three types of centre holes:

    Type A - Centre holes without protecting chamfers

    Type I3 - Centre holes with protecting chamfers

    Type R - Centre holes with radius form

    Dimensions

    l Cenfre Holes

    Without Protecting Chamfers Type A

    I-4

    i-a-4

    Ail dimensions in miiiimetres.

    at

    Nominal

    Nominal

    Refetence

    _

    (05)

    I

    106

    10

    I

    2

    I

    063 )

    132 I2

    2

    -__-

    ____

    I70

    I5

    25

    1 0

    212

    I

    I9

    I

    3

    t

    125

    )

    265

    23

    I6

    335

    29

    ~-

    20

    425

    )__ X7

    2.5

    530

    46

    3 15

    670

    I

    59

    9

    _~ --_-- --

    _/

    4.0 850

    74 11

    ( 50 1 1060

    9.2 14

    83 1320 II5 18

    ( 80 1 1700

    14.8 22

    _ _-.

    100

    2120

    184

    28

    Note -

    Sizes given within brackets are non-preferred and shall be avoided whenever possible.

    *Dimensioin 1 depends upon length I of the centre drill according

    to

    IS : 6708-1972 Specification for &Me drills,

    Type A .

    it shall not, even in the case of drilling with re-sharpened centre drills, be less than the reference value f given

    in the table to ensure that the point of the centre does not touch the bot tom of the centre hole.

    tparting off dimension, if the centre hole is to be removedfrom the finished workpiece.

    I

    Adopted 27 November 1975

    I

    Q

    July 1932, BIS

    I

    Gr2

    BUREAU OF INDIAN STANDARDS

    MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

    NEW DELHI 1 oo02

    ( Reaffirmed 2002 )

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    IS : 2473 191s

    2.2 Centre HoIes With Protecting Chamfers Type B

    All dimensions in millimetres.

    NoL

    1'0

    (1.25)

    16

    20

    95

    315

    40

    ( 50 1

    63

    (80)

    100

    __

    -.

    __

    .-

    ._

    -

    -

    NOIL

    Refefence

    at

    315

    22

    35

    4

    27

    45

    5 36 56

    53

    43

    66

    8

    54

    83

    10 63 100

    125 86 127

    18 108 156

    13

    12.9

    -

    164

    __-

    204

    200

    224

    250

    28

    310

    -

    Noto-Sizes given within brackets are non-preferred and shall be avoided whenever possible.

    *Dimension L depends u

    It shall not, even

    P

    on length I of the centre drill according to IS : 6709-1972 Specification for centre drills,

    Type B .

    nthe case of drllllng with re-sharpened centre dri lls, be less than the reference value t given

    In the table to ensure that the point of the centre does not touch the bottom of the centre hole.

    tParting off dimension, If the centre hole is to be removed from the finished workpiece.

    2

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    .

    IS : 2473 1975

    Centre Holes With Radius Form, Typ e R

    All dimensions in millimetres.

    No:lnal

    I

    D

    Nominal

    10 212

    125 ) 265

    16 335

    -

    20 425

    2.5

    53

    315 87

    40 66

    ( 50 1

    106

    3

    I

    132

    (VO)

    170

    100

    -1

    212

    .

    _

    _.

    _

    .-

    Refetence

    19

    23

    2.9

    37

    46

    58

    74

    92

    114

    147

    183

    r

    Max

    yin

    915

    I

    15

    --_.-_ ---

    40

    315

    50 40

    63

    50

    80

    65

    100

    /

    80

    I

    125

    100

    180

    125

    200

    160

    25.0

    200

    315 250

    d

    8

    I

    4

    I

    5

    I

    6

    7

    9

    11

    14

    18

    22

    28

    Note -

    Sizes

    given within brackets are non-preferred and shall be avoided whenever possible.

    *Dimension L depends upon length I of the centre drill according to IS : 8710-1972 Specification for centre drills,

    Type D .

    It shall not, even in the case of drilling with m-sharpened centre drills, be less than the referencevalue t given

    in the table to ensure that the point of the centre does not touch the bottom of the centre hole.

    I

    TParting off dimension;if.the centre hole is to be removed rom the finished workpiece.

    Dimensional deviations for untoleranced dimensions; Medium class according to IS : 2102-1969

    Allowable deviations for dimensions without specified tolerances (first revision .

    Inspection purposes, a centre drill which has not been repround shall be used.

    For values of suitable limits of workpiece diameters for different sizes of centre holes, see

    Designation -

    A centre hole of Type A and diameter d = 16 mm shall be designated as:

    Centre Hole A x

    16

    IS

    : 2473

    3

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    IS : 2473 - 1975

    APPENDIX A

    ( Clause 2.6 )

    LIMITS OF WORKPIECE DIAMETERS FOR DIFFERENT SIZES OF CENTRE HOLES

    Nominal

    .I

    0.5

    I

    o-8

    I

    1'0

    I

    I

    I.6

    25

    40

    63

    10.0

    All dimensions in millimetres.

    Diameter of Workpiece

    Over

    up to

    -

    4

    4

    6

    6

    IO

    10

    16

    16

    40

    40 60

    -

    -

    -

    -

    Weight of Manufactured

    Workpiece, kg, ax

    / -

    -

    -

    -

    -

    -

    1600

    ~__ .~

    4000

    I

    Note

    -These values are for all types of centre holes (Types A, B and R) and are for information only.

    EXPLANATORY NOTE

    This standard was originally issued in the year 1963. The present revision has become

    necessary as the standard on centre drills IS : 664-1963 has since een revised and published

    splitting the original standard Into the following three sfandards:

    IS :.6708-1972 Specification for centre drills, Type A

    IS : 6709-1972 Specification for centre drills, Type 6

    IS : 6710-1972 Specification for centre drills, Type D

    This revision of IS :

    2473 has also brought the standard

    in line with the IS0 standard In

    addition, suitable limits of workpiece diameters

    for

    different sizes of centre holes have been

    included in an appendix far information.

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    AMENDMENT NO 2 J ANUARY 2 8

    TO

    IS 2 4 7 3 :1 9 7 5 DIMENSIONS FOR CENTRE HOLES

    First Revision

    Page 4, ExpIanatoty Note Substitute the following for the existing:

    This standard was originally issued in the year 1963. The present revision has

    become necessary as the standard on centre drills IS 664: 1963 has since been

    revised and published splitting the original standard into the following three

    standards:

    IS 6708:1977 Specification for centre drills, Type A

    K 6709:1977

    Specification for centre drills, Type B

    1S6710 :1977

    Specification for centre drills, Type R

    This revision of IS 2473 has also brought the standard in line with 1S0 866:

    1975, 1S0 2540: 1973, and 1S0 2541 : 1972 for Type A, Type B and Type R

    centre l+iolesrespectively. In addition, suitable limits of workpiece diameters for

    different sizes of centre holes have been included in appendix for

    information.

    PG 20

    ReprographyUnit,BIS,NewDelhi,India