SIST EN 4529-003:2026

• Abstract:

  This document specifies the required characteristics of sealing plugs, class T, for use in elements of electrical and optical connection containing cable (wire) sealing grommets, according to EN 4529-002. It is used together with EN 4529-001.

• Status: Published
• Public Enquiry End Date: 23-Jul-2025
• Publication Date: 29-Sep-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Sep-2026
• Due Date: 04-Dec-2026
• Completion Date: 30-Sep-2026
• Ref Project: EN 4529-003:2026 - Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part 003: Class T - Product standard

• Referred By: SIST EN 2997-001:2011 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 001: Technical specification
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 4529-002:2019 - Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part 002: Index of product standards
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 4529-002:2009 - Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part 002: Index of product standards
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 4701-001:2015 - Aerospace series - Connectors, optical, rectangular, modular, operating temperature 125 °C, for EN 4531-101 contacts - Part 001: Technical specification
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 2997-001:2017 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 001: Technical specification
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 4830-002:2016 - Aerospace series - Connectors, optical, rectangular, modular, operating temperature 125 °C, for EN 4639-10X contacts - Part 002: Specification of performance
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 4830-001:2016 - Aerospace series - Connectors, optical, rectangular, modular, operating temperature 125 °C, for EN 4639-10X contacts - Part 001: Technical specification
• Effective Date: 09-Sep-2026
• Revises: SIST EN 4529-003:2009 - Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part 003: Class T - Product standard
• Effective Date: 02-Oct-2024

SIST EN 4529-003:2026 is a CEN European Standard for sealing plugs, class T, in the aerospace series for elements of electrical and optical connection. It specifies the required characteristics, dimensions, material, tests, designation and technical specification for plugs used with cable (wire) sealing grommets, and it is used together with EN 4529-001.

What does SIST EN 4529-003:2026 specify?

SIST EN 4529-003:2026 specifies the required characteristics of sealing plugs, class T, for elements of electrical and optical connection that contain cable (wire) sealing grommets. The plugs are identified and applied in the context of EN 4529-002, and the document is used together with EN 4529-001.

The standard is organized into clauses 1 to 7:

• Scope
• Normative references
• Terms and definitions
• Required characteristics
• Designation
• Marking
• Technical specification

This structure tells the reader where to find the application limits, the test framework, the product definition and the ordering information.

What are the key requirements of SIST EN 4529-003:2026?

SIST EN 4529-003:2026 focuses on fit, material, operating temperature and verification. In practice, it tells a supplier what the plug must look like, what it is made of, how it is installed, and which tests are used to confirm that it meets the product standard.

Clause 4 - required characteristics

• Class T temperature range: Class T corresponds to an operating temperature range from -65 °C to 260 °C. This matters because the plug has to remain suitable across the environmental range expected in aerospace use.
• Dimensions, mass and colours: Clause 4.2 ties dimensions, mass and colours to Figure 1 and Table 1. This is what a purchaser or inspector uses to check that the correct size and visual identification have been supplied.
• Material: Clause 4.3 specifies polytetrafluroethylene (PTFE). This gives the material basis for procurement and for assessing suitability in service.
• Installation: Clause 4.4 says no installation tools apply and the sealing plug is fully inserted with the thicker end in front. This is important because correct orientation affects sealing performance.
• Tests: Clause 4.5 requires the tests listed in Table 2, including visual examination, dimensions and mass, insulation resistance, endurance at temperature, rapid change of temperature, mould growth, fluid resistance, flammability and hydrolytic stability. When the standard is produced from PTFE, several of those tests are not required, so the material choice affects the verification plan.
• Designation: Clause 5 gives the designation structure, combining the description, model and size code, with an optional originator code I9005. This is the reference used in ordering and traceability.
• Marking: Clause 6 states that marking is not applicable. That tells the user not to expect a mandatory product marking scheme in this standard.
• Technical specification: Clause 7 sends the technical specification to EN 4529-001. This keeps the product standard aligned with the companion technical specification.

What terms does SIST EN 4529-003:2026 define?

• Sealing plug: A plug used to seal an element of electrical and optical connection that contains cable (wire) sealing grommets.
• Class T: The sealing plug class covered by this standard, defined by the -65 °C to 260 °C operating range.
• Model N: The normal model variant listed in Table 1.
• Model L: The long model variant listed in Table 1.
• Size code: The code in Table 1 that links the plug to a connector cavity or module size.
• PTFE: Polytetrafluroethylene, the specified plug material.
• Technical specification: The linked specification for the product, given by EN 4529-001.

Who uses SIST EN 4529-003:2026?

SIST EN 4529-003:2026 is used by aerospace suppliers, test laboratories, quality teams and buyers who need to specify or verify sealing plugs for electrical and optical connection elements. It supports product definition, incoming inspection, qualification testing and part designation for class T plugs.

What changed in SIST EN 4529-003:2026 from the previous edition?

SIST EN 4529-003:2026 supersedes EN 4529-003:2006.

The European foreword states these significant technical changes:

• introduction of sealing plugs size code 10
• correction of dimension lines for ⌀ B in Figure 1

Which standards are used with SIST EN 4529-003:2026?

Standard	What it contributes
EN 4529-001	Terms and definitions, and the technical specification used with this product standard
EN 4529-002	The index of product standards that frames the use of sealing plugs in the series
EN 2591-101, -102, -206, -301, -305, -306, -315, -317, -515	Test methods for visual examination, dimensions and mass, insulation resistance, endurance at temperature, rapid change of temperature, mould growth, fluid resistance, flammability and hydrolytic stability
EN 2997-001	Conditions referenced for the fluid resistance test
EN 3155-001	Referenced in the test table and part of the related aerospace connection framework

What does the SIST EN 4529-003:2026 document contain?

SIST EN 4529-003:2026 contains Figure 1, Table 1 and Table 2, which are the core product data for the standard. Figure 1 shows the sealing plug shape, installation direction and optional recess profile. Table 1 gives the sizes, dimensions, mass, colours and the Model N and Model L variants. Table 2 lists the applicable test methods and the conditions used for verification. Clause 5 also gives a worked designation example, and clause 7 points to EN 4529-001 for the technical specification.

SLOVENSKI STANDARD
01-november-2026
Aeronavtika - Elementi električnih in optičnih povezav - Tesnilni čepi - 003. del:
Razred T - Standard za proizvod
Aerospace series - Elements of electrical and optical connection - Sealing plugs - Part
003: Class T - Product standard
Luft- und Raumfahrt - Elektrische und optische Verbindungselemente - Verschluss-
Stopfen - Teil 003: Klasse T - Produktnorm
Série aérospatiale - Organes de connexion électrique et optique - Obturateurs
d’étanchéité - Partie 003 : Classe T - Norme de produit
Ta slovenski standard je istoveten z: EN 4529-003:2026
ICS:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4529-003
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2026
EUROPÄISCHE NORM
ICS 49.060; 49.090 Supersedes EN 4529-003:2006
English Version
Aerospace series - Elements of electrical and optical
connection - Sealing plugs - Part 003: Class T - Product
standard
Série aérospatiale - Organes de connexion électrique et Luft- und Raumfahrt - Elektrische und optische
optique - Obturateurs d'étanchéité - Partie 003 : Classe Verbindungselemente - Verschluss-Stopfen - Teil 003:
T - Norme de produit Klasse T - Produktnorm
This European Standard was approved by CEN on 3 August 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4529-003:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Required characteristics . 6
4.1 Specific characteristics . 6
4.2 Dimensions – Mass, colours . 6
4.3 Material . 6
4.4 Dimensions and mass . 6
4.5 Tests . 8
5 Designation . 9
6 Marking . 9
7 Technical specification . 9
Bibliography . 10

European foreword
This document (EN 4529-003:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document 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 2027, and conflicting national standards shall be
withdrawn at the latest by March 2027.
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.
This document supersedes EN 4529-003:2006.
EN 4529-003:2006:
— introduction of sealing plugs size code 10;
— correction of dimension lines for ⌀ B in Figure 1.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the natio
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