ISO 14541:2013

Hydraulic fluid power - Dimensions and requirements for screw-to-connect quick-action couplings for general purpose

ISO 14541:2013 specifies the dimensional and performance requirements for hydraulic screw-to-connect quick-action couplings for general use.

Transmissions hydrauliques — Dimensions et exigences des raccords rapides de type à visser pour usage général

General Information

• Status: Published
• Publication Date: 14-Mar-2013
• ICS: 23.100.40 - Piping and couplings
• Technical Committee: ISO/TC 131/SC 4 - Connectors and similar products and components
• Drafting Committee: ISO/TC 131/SC 4 - Connectors and similar products and components
• Current Stage: 9092 - International Standard to be revised
• Start Date: 05-Sep-2025
• Completion Date: 13-Dec-2025

Overview

ISO 14541:2013 specifies the dimensional and performance requirements for screw-to-connect quick-action couplings used in hydraulic fluid power systems for general purpose. The standard sets requirements for geometry, marking, designation and verification tests to ensure safe, reliable and interchangeable hydraulic couplings.

This International Standard is intended for manufacturers, designers and procurement specialists who require a common reference for coupling dimensions, endurance and pressure performance.

Key Topics

• Scope: Dimensional and performance requirements for screw-to-connect quick-action hydraulic couplings for general use.
• Dimensional requirements: Couplings shall conform to specified drawings and tabulated dimensions; thread dimensions conform to ISO 724 with tolerances per ISO 965-1. Sleeve shapes (round with flats or hexagonal) and relative rotation design are addressed.
• Performance requirements:
  • Minimum burst and maximum working pressures are specified per coupling size.
  • Verification by pressure impulse testing in accordance with ISO 7241-2: 200,000 cycles (uncoupled) and 500,000 cycles (coupled).
  • Burst pressure, pressure drop at rated flow rate, fluid loss (spillage) and surge flow capability are required to meet test criteria.
  • Couplings must be designed to be connected with a residual internal pressure equal to 33% of maximum working pressure and pass 100 connection cycles at that pressure without loss of function.
• Terms and definitions: Key terms such as fluid loss, male half, sleeve and residual static pressure are defined, referencing ISO 5598 vocabulary where applicable.
• Assembly and marking: Guidance is provided to avoid hose torsion during assembly (use of wrenches or grips). An optional indicator device (e.g., O-ring) on the female half can be used to indicate final connection position. Permanent marking with manufacturer identification is required.

Applications

ISO 14541:2013 is applicable to general-purpose hydraulic systems where quick-action screw-to-connect couplings are used to join or separate fluid conductors by hand or tool. Typical practical benefits include:

• Improved interchangeability between manufacturers
• Reduced fluid spillage during disconnection
• Verified endurance and burst-pressure performance for safer operation
• Clear designation and marking for traceability in equipment and maintenance

This standard is useful for hydraulic component manufacturers, system integrators, maintenance teams and purchasing departments who need a reliable specification for coupling selection and testing.

Related Standards

• ISO 724 - General-purpose metric screw threads
• ISO 965-1 - Thread tolerances
• ISO 1302 - Surface texture indication
• ISO 5598 - Fluid power vocabulary
• ISO 7241-2 - Quick-action coupling test methods
• ISO 4397 - Nominal hose sizes

These referenced standards support the dimensional, tolerance, surface and test-method requirements cited in ISO 14541:2013.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14541
First edition
2013-03-15
Hydraulic fluid power — Dimensions
and requirements for screw-to-
connect quick-action couplings for
general purpose
Transmissions hydrauliques — Dimensions et exigences des raccords
rapides de type à visser pour usage général
Reference number
©
ISO 2013
© ISO 2013
All rights reserved. Unless otherwise specified, 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.
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Published in Switzerland
ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensional requirements . 1
5 Performance requirements . 3
6 Assembly instruction . 3
7 Designation . 4
8 Marking . 4
9 Identification statement (reference to this International Standard) . 4
Bibliography . 5
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. 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. 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.
The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 4,
Connectors and similar products and components.
iv © ISO 2013 – All rights reserved

Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure
within an enclosed circuit.
Quick-action couplings, including the screw-to-connect type, are used to join or separate fluid conductors
either by hand or the use of a tool.
INTERNATIONAL STANDARD ISO 14541:2013(E)
Hydraulic fluid power — Dimensions and requirements for
screw-to-connect quick-action couplings for general purpose
1 Scope
This International Standard specifies the dimensional and performance requirements for hydraulic
screw-to-connect quick-action couplings for general use.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, onl
...