EN ISO 9974-1:2000

SLOVENSKI STANDARD
01-november-2001
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Connections for general use and fluid power - Ports and stud ends with ISO 261 threads
with elastomeric or metal-to-metal sealing - Part 1: Threaded ports (ISO 9974-1:1996)
Leitungsanschlüsse für Fluidtechnik und allgemeine Anwendung - Einschraublöcher und
Einschraubzapfen mit Gewinde nach ISO 261 und Elastomerdichtung oder metallener
Dichtkante - Teil 1: Einschraublöcher (ISO 9974-1:1996)
Raccordements pour applications générales et transmissions hydrauliques et
pneumatiques - Orifices et éléments mâles a filetage ISO 261 et joints en élastomere ou
étanchéité métal sur métal - Partie 1: Orifices filetés (ISO 9974-1:1996)
Ta slovenski standard je istoveten z: EN ISO 9974-1:2000
ICS:
23.100.60 )LOWULWHVQLODLQ Filters, seals and
RQHVQDåHYDQMHWHNRþLQ contamination of fluids
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IS0
INTERNATIONAL
9974-l
STANDARD
First edition
1996-04-l 5
Connections for general use and fluid
power - Ports and stud ends with IS0 261
threads with elastomeric or metal-to-metal
sealing -
Part 1:
Threaded ports
Raccordements pour applications g&Wales et transmissions h ydrauliques
Orifices et &men ts males ii filetage IS0 26 7 et joint
et pneumatiques -
en bias tom&e ou 6 tanchktd m&al sur m&al -
Partie ir : Orifices filet&
Reference number
IS0 9974-l : 1996(E)
IS0 9974=1:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide fed-
eration of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be rep-
resented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. IS0 col-
laborates closely with the International Electrotechnical Commission (IEC)
on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are cir-
culated 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 IS0 9974-l was prepared jointly by Technical
Committees ISOFC 5, Ferrous metal pipes and metallic fittings, Sub-
committee SC 5, Threaded or plain end butt-we/ding fittings, threads,
gauging of threads, and lSO/TC 131, Fluid power systems, Subcommittee
SC 4, Connectors and similar products and components.
IS0 9974 consists of the following parts, under the general title Connec-
tions for general use and fluid power - Ports and stud ends with IS0 261
threads with elastomeric or metal-to-metal sealing.
- Part 1: Threaded ports
- Part 2: Stud ends with elastomeric sealing (type E)
Part 3: Stud ends with metal-to-metal sealing (type 6)
The performance requirements, dimensions and designs are defined for
port and stud end connections for the L and S series in IS0 9974-Z and for
the LL, L and S series in IS0 9974-3. Significant testing over more than
30 years of use has confirmed the performance requirements of these
port and stud end connections.
Stud ends conforming to IS0 9974-2 and 9974-3 are identical to those
conforming to DIN 3852-l. IS0 9974-2 stud ends are used on IS0 8434-l
and IS0 8434-4 fittings, and IS0 9974-3 stud ends are used on IS0 8434-l
fittings.
Annex A of this part of IS0 9974 is for information only.
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be
reproduced or utilized in any form or by any means, electronic or mechanical, including
photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-121 IG eneve 20 l Switzerland
Printed in Switzerland
ii
IS0 9974=1:1996(E)
0 IS0
Introduction
In fluid power systems, power is transmitted and controlled through a fluid
(liquid or gas) under pressure within an enclosed circuit. In general appli-
cations, a fluid may be conveyed under pressure.
Components are connected through their threaded ports by fluid conduc-
tor fittings to tubes and pipes or to hose fittings and hoses.
Ports are an integral part of fluid power components, such as pumps,
motors, valves, cylinders, etc.

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INTERNATIONAL STANDARD @ IS0
IS0 9974=1:1996(E)
Connections for general use and fluid power - Ports and stud
ends with IS0 261 threads with elastomeric or metal-to-metal
sealing -
Part I:
Threaded ports
standards indicated below. Members of IEC and IS0
1 Scope
maintain registers of currently valid International Stan-
dards.
This part of IS0 9974 specifies dimensions for ports with
IS0 261 threads and elastomeric (type E) or metal-to-
IS0 261:- 21, IS0 general-purpose metric screw
metal (type B) sealing for general use and in fluid
threads - General plan.
power applications with the stud ends detailed in
IS0 9974-2 and IS0 9974-3. It also specifies test
IS0 5598: 1985, Fluid power systems and components
methods and the designation of these ports.
- Vocabulary.
Ports in accordance with this part of IS0 9974
...