SIST EN 6141:2020

Aerospace series - Plug, protective, non-metallic, for EN 6123 fitting ends

This document specifies the dimensions, tolerances and required characteristics of protective plugs, non metallic, for EN 6123 fitting ends to seal fluid ports during transportation and storage in order to prevent
- contamination by moisture, fluids, chemicals and particles,
- spillage inside package or aircraft section,
- port and pipe end damages and
- port and pipe clogging due to plug ingestion.
Because of the cleanliness requirements, parts shall only be used once.

Luft- und Raumfahrt - Stopfen, nicht metallisch, zum Schutz für Endfittinge nach EN 6123

In diesem Dokument werden die Maße, Toleranzen und erforderlichen Kennwerte von nichtmetallischen Stopfen zum Schutz für Endfittinge nach EN 6123 festgelegt, mit denen Fluidanschlüsse während des Transports und der Aufbewahrung verschlossen werden, um Folgendes zu verhindern:
- Verunreinigung durch Feuchtigkeit, Fluide, Chemikalien und Partikel;
- Leckage innerhalb der Verpackung oder einer Luftfahrzeugsektion;
- Beschädigung an Anschlüssen und Rohrenden; und
- Verstopfung von Anschlüssen und Rohren aufgrund des Ansaugens von Stopfen.
Wegen der Reinheitsanforderungen dürfen die Teile stets nur einmal verwendet werden.

Série aérospatiale - Prise, protectrice,non métallique pour raccord <kleiner => 5 000 PSI circuits hydrauliques

Le présent document spécifie les dimensions, les tolérances et les caractéristiques requises pour les fiches de protection, non métalliques, pour raccords EN 6123, destinées à l’étanchéité des orifices pour les liquides pendant le transport et le stockage afin d’éviter :
- une contamination par moisissure, fluides, produits chimiques et particules,
- un renversement à l’intérieur de l’emballage ou de la section de l’aéronef,
- des endommagements des orifices et de l'extrémité des tuyaux, et
- le bouchage des orifices et des tuyaux à cause de l'absorption de la fiche.
En raison des exigences de propreté, les pièces ne doivent être utilisées qu’une seule fois.

Aeronavtika - Vtič, zaščita, nekovinska, za končno vgradnjo po EN 6123

General Information

• Status: Published
• Publication Date: 24-Sep-2020
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Sep-2020
• Due Date: 29-Nov-2020
• Completion Date: 25-Sep-2020
• Ref Project: EN 6141:2020 - Aerospace series - Plug, protective, non-metallic, for EN 6123 fitting ends

SIST EN 6141:2020 Overview

SIST EN 6141:2020 is a European aerospace standard that defines non-metallic protective plugs for EN 6123 fitting ends. These plugs are critical components used to seal fluid ports on aircraft and aerospace fluid systems during transportation and storage. Their primary purpose is to protect fluid ports from contamination, spillage, damage, and clogging, ensuring the integrity and cleanliness of hydraulic and fluid systems in aerospace applications.

This standard specifies the dimensions, tolerances, materials, sealing characteristics, and quality requirements for these protective plugs. It ensures that the plugs provide reliable protection against moisture, fluids, chemicals, particles, and physical damage. Importantly, due to stringent cleanliness demands in aerospace environments, these plugs are intended for single-use only.

Key Topics

• Scope and Purpose
  EN 6141 plugs are designed to seal EN 6123 fitting ends to prevent contamination, spillage, damage, and clogging in fluid ports during storage and transport.

• Dimensions and Tolerances
  The standard details exact plug configurations, dimensions, and linear tolerances based on ISO 2768-m, ensuring compatibility and effective sealing with EN 6123 fittings.

• Material and Resistance
  Plugs are made from high-density polyethylene (HD-PE), featuring specific density and melt flow index requirements to guarantee resistance to phosphate ester-based hydraulic fluids (ISO 9940 compliant).

• Temperature and Pressure Requirements
  Operational storage temperatures range from -54 °C to 85 °C, with installation/removal recommended near room temperature (25 ± 10 °C). Plugs must withstand a proof pressure of 100 kPa without leakage or deformation.

• Cleanliness Standards
  To meet aerospace fluid cleanliness, plugs comply with ISO 11218 Class 7 or better, and packaging maintains cleanliness until opening.

• Marking and Packaging
  Plugs are permanently marked with manufacturer information and standard part designation in accordance with EN 2424, with chlorine-free, impact-resistant packaging to preserve quality during storage and transport.

• Testing and Quality Assurance
  Qualification includes first article inspection and sealing tests under specified conditions. Manufacturers must operate under approved aerospace quality systems (e.g., EN 9100).

Applications

EN 6141 plugs serve critical protection roles in:

• Aerospace fluid and hydraulic systems: Sealing fluid ports during manufacturing, transport, and maintenance to prevent contamination and fluid loss.
• Aircraft assembly and storage: Safeguarding sensitive hydraulic fittings from dirt, moisture, and damage that could compromise system integrity.
• Defense and space equipment: Ensuring contamination-free hydraulic lines where system failure is not an option.
• Aerospace supply chain logistics: Protecting fluid system components during shipping and handling to meet strict aerospace cleanliness and quality requirements.

Adopting EN 6141 plugs enhances maintenance efficiency, reduces risk of hydraulic system failures, and helps aerospace organizations meet industry safety and quality standards.

Related Standards

• EN 6123 – Design standard for aerospace fitting ends (24° internal cone, external thread, flareless type).
• EN 2424 – Marking requirements for aerospace products.
• ISO 9940 – Technical specifications for phosphate ester-base fire resistant aerospace fluids.
• ISO 11218 – Cleanliness classification standards for hydraulic fluids.
• ISO 2768-1 – General tolerances for linear and angular dimensions without individual tolerance indications.
• ISO 3161 – Aerospace UNJ thread general requirements and limit dimensions.
• EN 9100 – Quality management systems for aerospace organizations ensuring consistent product quality and reliability.

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SIST EN 6141:2020 is essential for aerospace manufacturers, suppliers, and maintenance providers focused on maintaining fluid system integrity through reliable, non-metallic protective plugs designed to aerospace-grade specifications. It supports contamination control, component protection, and compliance with demanding aerospace industry requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2020
Aeronavtika - Vtič, zaščita, nekovinska, za končno vgradnjo po EN 6123
Aerospace series - Plug, protective, non-metallic, for EN 6123 fitting ends
Luft- und Raumfahrt - Stopfen, nicht metallisch, zum Schutz für Endfittinge nach EN
Série aérospatiale - Prise, protectrice,non métallique pour raccord 5 000 PSI
circuits hydrauliques
Ta slovenski standard je istoveten z: EN 6141:2020
ICS:
49.080 Letalski in vesoljski Aerospace fluid systems and
hidravlični sistemi in deli components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 6141
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Plug, protective, non-metallic, for EN
6123 fitting ends
Série aérospatiale - Fiche, de protection, non Luft- und Raumfahrt - Stopfen, nicht metallisch, zum
métallique, pour raccords EN 6123 Schutz für Endfittinge nach EN 6123
This European Standard was approved by CEN on 22 December 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 6141:2020 E
worldwide for CEN national Members.

Contents
Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 5
4.1 Configuration, dimensions, tolerances and mass . 5
4.2 Material, surface treatment and colour . 5
4.3 Sealing areas . 5
4.4 Proof Pressure . 5
4.5 Temperature range . 5
4.5.1 Storage and transportation temperature . 5
4.5.2 Installation and removal . 5
4.5.3 Cleanliness . 5
5 Technical requirement. 7
5.1 General . 7
5.2 First article inspection . 7
6 Designation. 7
7 Marking . 7
8 Packaging . 8
9 Technical specification . 8
9.1 Simple standard part . 8
9.2 Production lot (batch) . 8
9.3 Materials . 9
9.4 Approval of manufacturers . 9
9.5 Responsibility for inspection . 9
9.6 Labelling . 9
9.7 Unit and transport packages . 9
Bibliography . 10

European foreword
This document (EN 6141:2020) has been prepared by the Aerospace and Defence Industries
Association of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, P
...