SIST EN ISO 9974-3:2001

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 3: Stud ends with metal-to-metal sealing
(type B) (ISO 9974-3:1996)
Leitungsanschlüsse für Fluidtechnik und allgemeine Anwendung - Einschraublöcher und
Einschraubzapfen mit Gewinde nach ISO 261 und Elastomerdichtung oder metallener
Dichtkante - Teil 3: Einschraubzapfen mit metallener Dichtkante (Typ B) (ISO 9974-
3:1996)
Raccordements pour applications générales et transmissions hydrauliques et
pneumatiques - Orifices et éléments mâles a filetage ISO 261 et joint en élastomere ou
étanchéité métal sur métal - Partie 3: Eléments mâles avec étanchéité métal sur métal
(type B) (ISO 9974-3:1996)
Ta slovenski standard je istoveten z: EN ISO 9974-3:2000
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.

INTERNATIONAL
STANDARD
First edition
1996-04-15
Connections for general use and fluid
power - Ports and stud ends with IS0 261
threads with elastomeric or metal-to-metal
sealing -
Part 3:
Stud ends with metal-to-metal sealing (type B)
Raccordemen ts pour applications g&&ales et transmissions h ydrauliques
et pneumatiques - Orifices et &men ts msles ;i filetage IS0 26 1 et joint
en blastomkre ou 6tanchbit4 m&al sur m&al -
Partie 3: i%ments males avec 6tanchMG m&al sur m&al (type B)
Reference number
IS0 9974-3:1996(E)
IS0 9974=3:1996(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 9974-3 was prepared jointly by Technical
Committees lSO/TC 5, ferrous metal pipes and metallic fittings, Sub-
committee SC 5, Threaded or plain end butt-we/ding fittings, threads,
gauging of threads, and ISO/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 I: Threaded ports
Part 2: Stud ends with elastomeric sealing (type E)
Part 3: Stud ends with metal-to-metal sealing (type B)
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 forms an integral part of this part of IS0 9974. Annex B 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-1211 Geneve 20 l Switzerland
Printed in Switzerland
IS0 9974=3:1996(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 co nnected through their th readed ports by stud ends on
fluid conductor fittin gs to tubes and pipes or to hose fittings a nd hoses.

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INTERNATIONAL STANDARD @ IS0 IS0 9974=3:1996(E)
Connections for general use and fluid power - Ports and stud
ends with IS0 261 threads with elastomeric or metal-to-metal
sealing -
Part 3:
Stud ends with metal-to-metal sealing (type B)
1 Scope 2 Normative references
The following standards contain provisions which,
This part of IS0 9974 specifies dimensions, perform-
through reference in this text, constitute provisions of
ance requirements and test procedures for heavy-duty
this part of IS0 9974. At the time of publication, the
(S series), light-duty (L series) and extra-light-duty
editions indicated were valid. All standards are subject
(LL series) stud ends with IS0 261 threads and metal-
to-metal sealing. It also specifies the designation of to revision, and parties to agreements based on this
these stud ends. These stud ends should not be used part of IS0 9974 are encouraged to investigate the
for leak-free hydraulic fluid power applications be- possibility of applying the most recent editions of the
cause they may leak if re-used. standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Stan-
dards.
Stud ends in accordance with this part of IS0 9974
may’ be used at working pressures up to IO MPa
IS0 261:- 21, IS0 general-purpose metric screw
(I 00 bar 1)) for the LL series, 25 MPa (250 bar) for the
threads - General plan.
L series and 40 MPa (400 bar) for the S series. The
permissible working pressure depends upon the stud
IS0 3448: 1992, Industrial liquid lubricants - IS0 vis-
end size, materials, design, working conditions, appli-
cosity classification.
cation, etc.
IS0 4759-l :I 978, Tolerances for fasteners - Part 1:
For threaded ports and stud ends specified in new Bolts, screws and nuts with thread diameters be-
designs in hydraulic fluid power applications, only
tween I,6 (inclusive) and 750 mm (inclusive) and
IS0 6149 is to be used. Threaded ports and stud
product grades A, B and C.
ends in accordance with IS0 1179, IS0 9974 and
IS0 11926 are not to be used for new designs in
IS0 5598: 1985, Fluid power systems and components
hydraulic fluid power applications.
- Vocabulary.
IS0 6508: 1986, Metallic materjals - Hardness test -
Conformance to the dimensional information in this
Rockwelltest(scalesA-B-C-D-E-F-G-H-K).
part of IS0 9974 does not guarantee rated perform-
ance. Each manufacturer should perform testing
according to the specification contained in this part of IS0 6803:1994, Rubber or plastics hoses and hose
IS0 9974 to assure that components comply with the assemblies
- Hydraulic pressure impulse test with-
performance ratings. out flexing.
I) 1 bar = 0,l MPa = 105 Pa; 1 MPa = 1 N/mm2
2) To be published. (Revision of IS0 261 :I 973)

0 IS0
IS0 9974=3:1996(E)
7.12 Materials
3 Definitions
Test blocks shall be unplated and hardened to 45 HRC
For the purposes of this part of IS0 9974, the defi-
to 50 HRC (see IS0 6508). Stud ends shall be made
nitions given in IS0 5598 apply.
from low carbon steel and plated.
7.1.3 Procedure
4 Dimensions
7.1.3.1 Thread lubrication
Stud ends shall conform to the dimensions shown in
For testing only, threads and contact surfaces shall be
figure 1 and given in table 1. Hex tolerances across
lubricated with hydraulic oil with a viscosity of VG 32
flats shall be in accordance with IS0 4759-1, product
in accordance with IS0 3448 prior to the application of
grade C.
torque.
7.1.3.2 Stud end torque
Test stud ends after application of the torques given in
5 Requirements
table 3.
7.1.3.3 Pressure rise rate
5.1 Working pressure
During the burst test, the rate of pressure rise shall
Stud ends made of low carbon steel shall be designed
not exceed 138 MPa/min (1 380 bar/min).
for use at the working pressures given in table 2.
7.1.4 Test report
5.2 Performance
Test results and conditions shall be reported on the
test data form given in annex A.
Stud ends made of low carbon steel shall meet at
least the burst and impulse pressures given in table 2,
when tested in accordance with clause 7.
7.2 Cyclic endurance (impulse) test
7.2.1 Principle
6 Metal-to-metal sealing
Test six samples at their respective impulse press-
ures.
The machined seal edge is compressed during as-
sembly. This causes damage to the sealing face of the
port. Safe re-assembly is not possible. A high surface
7.2.2 Materials
pressure shall also be obtained, otherwise leakage is
possible.
Use the same materials as those given in 7.12.
7.2.3 Procedures
7 Test methods
7.2.3.1 Thread lubrication
burs
...