SIST ISO 4399:2021
(Main)Fluid power systems and components -- Connectors and associated components -- Nominal pressures
Fluid power systems and components -- Connectors and associated components -- Nominal pressures
This document specifies a selection of nominal pressures for hydraulic and pneumatic fluid power connectors and associated components.
NOTE There can be a need to provide a selection of nominal pressures for connectors and associated components used in applications where the external pressure on the components is greater than the internal pressure, for example vacuum service. A document that deals with this subject will be established in due course.
Transmissions hydrauliques et pneumatiques -- Raccords et composants associés -- Pressions nominales
Fluidna tehnika - Priključki in pripadajoče komponente - Nazivni tlaki
General Information
- Status
- Published
- Publication Date
- 09-Jun-2021
- Technical Committee
- IHPV - Hydraulics and pneumatics
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jun-2021
- Due Date
- 06-Aug-2021
- Completion Date
- 10-Jun-2021
Relations
- Effective Date
- 01-Jul-2021
Overview
ISO 4399:2019 - "Fluid power systems and components - Connectors and associated components - Nominal pressures" provides a standardized selection of nominal pressures for hydraulic and pneumatic connectors and their associated components. The third edition updates common pressure values and clarifies how nominal pressures are expressed and used for component designation. It applies to designers, manufacturers, test laboratories, procurement specialists and anyone specifying fluid power connectors for hydraulic and pneumatic systems.
Key Topics
- Selection of nominal pressures: Nominal pressures for connectors and associated components are specified in a reference table (Table 1). These values are intended for convenient designation and series classification.
- Units and expression: Nominal pressures shall be expressed in megapascals (MPa) in text, with the equivalent value in bar shown in parentheses (e.g., 10 MPa (100 bar)).
- Gauge pressure assumption: Unless otherwise specified, nominal pressures are assumed to be gauge pressure (pressure above atmospheric).
- Preferred vs non-preferred values: Some values are shown in square brackets in Table 1 and are non-preferred; these bracketed values shall not be used for new designs.
- Normative references: The standard refers to ISO 2944 (Nominal pressures) and ISO 5598 (Vocabulary), ensuring consistent terminology and broader pressure-selection rules.
- Future considerations: The document notes potential need for nominal pressure selections where external pressure exceeds internal pressure (e.g., vacuum service) and that a dedicated document will be developed.
Applications
ISO 4399:2019 is used in practical tasks such as:
- Specifying pressure ratings for hydraulic connectors, pneumatic connectors, fittings and associated components in product catalogs and procurement documents.
- Ensuring consistent interoperability and safety across components from different manufacturers by using standardized nominal pressures.
- Supporting test reports, quality control and conformity statements for fluid power components.
- Guiding system designers when selecting connectors for hydraulic systems (e.g., mobile equipment, industrial hydraulics) and pneumatic systems (e.g., automation, process control).
Who uses it:
- Component manufacturers and suppliers
- Design and R&D engineers in fluid power systems
- Test laboratories and certification bodies
- Procurement and maintenance teams
Related Standards
- ISO 2944 - Fluid power systems and components - Nominal pressures
- ISO 5598 - Fluid power systems and components - Vocabulary
- Prepared by ISO/TC 131 (Fluid power systems), Subcommittee SC 4 (Connectors)
Identification statement for use in literature: "Nominal pressures for connectors and associated components are selected from ISO 4399, Fluid power systems and components - Connectors and associated components - Nominal pressures."
Keywords: ISO 4399:2019, fluid power, nominal pressures, hydraulic connectors, pneumatic connectors, pressure ratings, MPa, bar.
Frequently Asked Questions
SIST ISO 4399:2021 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Fluid power systems and components -- Connectors and associated components -- Nominal pressures". This standard covers: This document specifies a selection of nominal pressures for hydraulic and pneumatic fluid power connectors and associated components. NOTE There can be a need to provide a selection of nominal pressures for connectors and associated components used in applications where the external pressure on the components is greater than the internal pressure, for example vacuum service. A document that deals with this subject will be established in due course.
This document specifies a selection of nominal pressures for hydraulic and pneumatic fluid power connectors and associated components. NOTE There can be a need to provide a selection of nominal pressures for connectors and associated components used in applications where the external pressure on the components is greater than the internal pressure, for example vacuum service. A document that deals with this subject will be established in due course.
SIST ISO 4399:2021 is classified under the following ICS (International Classification for Standards) categories: 23.100.40 - Piping and couplings. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ISO 4399:2021 has the following relationships with other standards: It is inter standard links to SIST ISO 4399:1995. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST ISO 4399:2021 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST ISO 4399:1995
Fluidna tehnika - Priključki in pripadajoče komponente - Nazivni tlaki
Fluid power systems and components -- Connectors and associated components --
Nominal pressures
Transmissions hydrauliques et pneumatiques -- Raccords et composants associés --
Pressions nominales
Ta slovenski standard je istoveten z: ISO 4399:2019
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 4399
Third edition
2019-07
Fluid power systems and
components — Connectors and
associated components — Nominal
pressures
Transmissions hydrauliques et pneumatiques — Raccords et
composants associés — Pressions nominales
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units . 1
5 Nominal pressures . 2
6 Identification statement (Reference to this document) . 2
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. Each 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights
...
INTERNATIONAL ISO
STANDARD 4399
Third edition
2019-07
Fluid power systems and
components — Connectors and
associated components — Nominal
pressures
Transmissions hydrauliques et pneumatiques — Raccords et
composants associés — Pressions nominales
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Units . 1
5 Nominal pressures . 2
6 Identification statement (Reference to this document) . 2
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. Each 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific t
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...