SIST EN 2876:2023

Aerospace series - Nuts, hexagon, plain, reduced height, normal across flats, in aluminium alloy, anodized - Classification: 450 MPa (at ambient temperature)/120 °C

This document specifies the characteristics of hexagonal plain nuts, reduced height, normal across flats, in aluminium alloy, anodized, for aerospace applications.
Classification: 450 MPa /120 °C .

Luft- und Raumfahrt - Flache Sechskantmuttern, verringerte Höhe, normale Schlüsselweite, aus Aluminiumlegierung, anodisiert - Klasse: 450 MPa (bei Raumtemperatur)/120 °C

Dieses Dokument legt die Eigenschaften von flachen, anodisierten Sechskantmuttern mit normaler Schlüsselweite und verringerter Höhe aus Aluminiumlegierung für Anwendungen in der Luft  und Raumfahrt fest.
Klasse: 450 MPa /120 °C .

Série aérospatiale - Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux, en alliage d'aluminium, anodisés - Classification : 450 MPa (à température ambiante)/120 °C

Le présent document spécifie les caractéristiques des écrous hexagonaux ordinaires, de hauteur réduite, à surplats normaux, en alliage d’aluminium, anodisés, pour les applications aérospatiales.

Aeronavtika - Matice, šestrobe, drsne, zmanjšana višina, z normalnim zevom ključa, iz aluminijeve litine, anodizirane - Klasifikacija: 450 MPa (pri okoljski temperaturi)/120 °C

Ta dokument določa lastnosti šestrobih drsnih matic, zmanjšane višine, z normalnim zevom ključa, iz aluminijeve litine, anodiziranih za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 19-Oct-2023
• ICS: 49.030.30 - Nuts
• ICS: 77.150.10 - Aluminium products
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-Oct-2023
• Due Date: 16-Dec-2023
• Completion Date: 20-Oct-2023
• Ref Project: EN 2876:2023 - Aerospace series - Nuts, hexagon, plain, reduced height, normal across flats, in aluminium alloy, anodized - Classification: 450 MPa (at ambient temperature)/120 °C

Relations

• Revises: SIST EN 2876:2019 - Aerospace series - Nuts, hexagon, plain, reduced height, normal across flats, in aluminium alloy, anodized - Classification: 450 MPa (at ambient temperature)/120 °C
• Effective Date: 28-Jan-2023

Overview

EN 2876:2023 specifies the characteristics of hexagon plain nuts, reduced height, normal across flats, in aluminium alloy, anodized for aerospace applications. Published by CEN and prepared by ASD‑STAN, this edition supersedes EN 2876:2019 and classifies the nuts as 450 MPa (at ambient temperature) / 120 °C. The standard defines dimensional, material, surface treatment, tolerance, marking and designation requirements applicable to aerospace‑grade aluminium nuts designed for lightweight, corrosion‑resistant fastening.

Key Topics

• Scope & Classification: Nuts are classified by minimum tensile stress (450 MPa) and maximum service temperature after recovery (120 °C).
• Dimensions & Configuration: Detailed geometry, masses and dimensions (including MJ thread codes) are given in Figure 1 and Table 1; dimensions follow ISO 9609 and are expressed in millimetres after surface treatment. Typical thread codes covered range from MJ4 to MJ24.
• Threads: Threads shall conform to ISO 5855‑2 (MJ threads).
• Tolerances: Linear tolerances per ISO 286‑2 and form/position tolerances per ISO 8788.
• Materials: Aluminium alloy selection follows the referenced technical report TR 3823‑002.
• Surface Treatment: Anodizing requirements are specified by EN 2284 (sulphuric acid anodizing for aluminium).
• Marking & Designation: Marking rules reference EN 2424; designation blocks and optional codes (e.g., I9005) are provided.
• Procurement & Quality: Technical procurement specification follows ISO 9139; manufacturer approval should comply with EN 9100.

Applications

EN 2876:2023 is intended for organizations that design, manufacture, procure or inspect aerospace fasteners where lightweight, anodized aluminium nuts are required. Typical users and use cases include:

• Aerospace OEMs and sub‑contractors specifying fasteners for airframe assemblies where reduced height nuts save space or weight.
• Fastener manufacturers producing aluminium alloy, anodized hexagon nuts to aerospace tolerances and markings.
• Procurement engineers and quality managers preparing purchase specifications and acceptance criteria.
• MRO and maintenance teams ensuring replacement parts meet the required classification (450 MPa / 120 °C) and surface treatment.

The reduced‑height, normal‑across‑flats design makes these nuts suitable for confined spaces and assemblies requiring standardized across‑flat dimensions for tooling.

Related Standards

• ISO 9609 - Dimensions for hexagon nuts with MJ threads
• ISO 5855‑2 - MJ thread limit dimensions
• ISO 8788 - Tolerances of form and position for nuts
• EN 2284 - Sulphuric acid anodizing for aluminium alloys
• EN 2424 - Marking of aerospace products
• ISO 9139 - Procurement specification for plain or slotted nuts
• EN 9100 - Aerospace quality management (manufacturer approval)

For specification or procurement, reference EN 2876:2023 together with the listed normative standards to ensure full compliance with aerospace fastener requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2023
Aeronavtika - Matice, šestrobe, drsne, zmanjšana višina, z normalnim zevom
ključa, iz aluminijeve litine, anodizirane - Klasifikacija: 450 MPa (pri okoljski
temperaturi)/120 °C
Aerospace series - Nuts, hexagon, plain, reduced height, normal across flats, in
aluminium alloy, anodized - Classification: 450 MPa (at ambient temperature)/120 °C
Luft- und Raumfahrt - Flache Sechskantmuttern, verringerte Höhe, normale
Schlüsselweite, aus Aluminiumlegierung, anodisiert - Klasse: 450 MPa (bei
Raumtemperatur)/120 °C
Série aérospatiale - Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux,
en alliage d'aluminium, anodisés - Classification : 450 MPa (à température
ambiante)/120 °C
Ta slovenski standard je istoveten z: EN 2876:2023
ICS:
49.030.30 Matice Nuts
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 2876
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2023
EUROPÄISCHE NORM
ICS 49.030.30 Supersedes EN 2876:2019
English Version
Aerospace series - Nuts, hexagon, plain, reduced height,
normal across flats, in aluminium alloy, anodized -
Classification: 450 MPa (at ambient temperature)/120 °C
Série aérospatiale - Écrous hexagonaux ordinaires, Luft- und Raumfahrt - Flache Sechskantmuttern,
hauteur réduite, surplats normaux, en alliage verringerte Höhe, normale Schlüsselweite, aus
d'aluminium, anodisés - Classification : 450 MPa (à Aluminiumlegierung, anodisiert - Klasse: 450 MPa (bei
température ambiante)/120 °C Raumtemperatur)/120 °C
This European Standard was approved by CEN on 7 August 2023.

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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2876:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
4.1 Configuration — Dimensions — Masses . 5
4.2 Tolerances of form and position . 7
4.3 Materials . 7
4.4 Surface treatment . 7
5 Designation . 7
6 Marking . 7
7 Technical specification . 7
Bibliography . 8

European foreword
This document (EN 2876:2023) 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 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 2024, and conflicting national standards shall
be withdrawn at the latest by March 2024.
This document supersedes EN 2876:2019.
normative references updated;
Figure 1 updated;
Bibliography updated;
document editorially revised.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be f
...