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SIST ISO 724:1995
01-november-1995
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ISO general-purpose metric screw threads -- Basic dimensions
Filetages métriques ISO pour usages généraux -- Dimensions de base
Ta slovenski standard je istoveten z: ISO 724:1993
ICS:
21.040.10 Metrski navoji Metric screw threads
SIST ISO 724:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 724:1995
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SIST ISO 724:1995
ISO
INTERNATIONAL
724
STANDARD
Second edition
1993-1 O-l 5
ISO general-purpose metric screw
- Basic dimensions
threads
Filetages metnques ISO pour usages gknkaux - Dimensions de base
Reference number
ISO 724:1993(E)
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SIST ISO 724:1995
ISO 724:1993(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations. governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 724 was prepared by Technical Committee
ISO/TC 1, Screw threads, Sub-Committee SC 1, Basic data.
This second edition cancels and replaces the first edition (ISO 724:1978),
the table of which has been technically revised.
ca ISO 1993
All rights reserved. NO part of this pubiication may be reproduced or utilized in any form or
by any means, electronie or mechanical, including photocopying and mlcrofilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l Cl-l-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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SIST ISO 724:1995
ISO 724:1993(E)
INTERNATIONAL STANDARD
- Basic
ISO general-purpose metric screw threads
dimensions
d basic major diameter of external thread (nominal
1 Scope
diameter)
This International Standard specifies the basic dimen-
basic pitch diameter of internal thread
D2
sions, in millimetres, of ISO metric screw threads in
accordance with ISO 261. The values refer to the
basic pitch diameter of external thread
4
basic Profile in accordance with ISO 68.
basic minor diameter of internal thread
4
basic minor diameter of external thread
4
2 Normative references
H height of fundamental triangle
The following Standards contain provisions which,
P pitch
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All Standards
are subject to revision, and Parties to agreements
based on this International Standard are encouraged
to investigate the possibility of applying the most re-
cent editions of the Standards indicated below.
Members of IEC and ISO maintain registers of cur-
rently valid International Standards.
5 Basic dimensions
I so 68:-“, ISO general-purpose screw threads -
Dimensions shall be as shown in figure 1 and given in
Basic Profile.
table 1.
ISO 261 :-2), ISO general-purpose metric screw
threads - General plan.
ISO 5408: 1983, Cylindrical screw threads - Vocabu-
.
lary
3 Definitions
For the purposes of this International Standard, the
definitions given in ISO 5408 apply.
4 Symbols
basic major diameter of internal thread (nomina
D
Figure ‘I - Basic dimensions
diameter)
1) To be published. (Revision of ISO 68:1973)
2) To be published. (Revision of ISO 261:1973)
1
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SIST ISO 724:1995
ISO 724:1993(E)
The values of D,, 4, D, and d, have been calculated
dz = d-2 x+H=d-0,649 5P
from the following formulae and rounded, in table 1,
to the third decimal place:
=D-2x
$H=D-1,082 5P
Dl
Dz=D-2x$ H = D - 0,649 5P
=d-2x -$-H=d-1,0825P
4
- Basic dimensions
Table 1
Nominal Nominal
Nominal
diameter diameter
diameter
Minor Pitch Pitch Minor
Pitch
Pitch Pitch
Pitch
diameter diameter diameter
= diameter diameter
= = Major Major
Major
diameter diameter
diameter
P P P
D, d Dt Dt d d D2f D2f d2 d2
D2J d2 41 4
1
3,242
0,7 3,545 3,545
0,7
4 4
3,459
0,5 0,5 3,675 3,675
0,75 4,013 3,688
4,5
4,175 3,959
W3 4,480 4
...