EN 3228:2022
(Main)Aerospace series - Nuts, hexagonal, plain, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C
Aerospace series - Nuts, hexagonal, plain, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C
This document specifies the characteristics of plain hexagonal nuts, reduced height, normal across flats, in steel, cadmium plated, for aerospace applications.
Classification: 900 MPa/235 °C.
Luft- und Raumfahrt - Flache Sechskantmuttern mit reduzierter Höhe, normale Schlüsselweite, aus Stahl, verkadmet - Klasse: 900 MPa (bei Raumtemperatur)/235 °C
Dieses Dokument legt die Eigenschaften von einfachen Sechskantmuttern mit reduzierter Höhe und normaler Schlüsselweite aus kadmiertem Stahl für Anwendung in der Luft- und Raumfahrt fest.
Klasse: 900 MPa/235 °C .
Série aérospatiale - Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux, en acier, cadmiés - Classification : 900 MPa (à température ambiante)/235 °C
Le présent document spécifie les caractéristiques des écrous hexagonaux ordinaires, de hauteur réduite, à surplats normaux, en acier, cadmiés, pour applications aérospatiales.
Classification : 900 MPa/235 °C.
Aeronavtika - Matice, šestrobe, drsne, z normalnim zevom ključa, iz jekla, kadmirane - Klasifikacija: 900 MPa (pri temperaturi okolice)/235 °C
Ta dokument določa značilnosti drsnih kadmiranih šestrobih matic iz jekla z normalnim zevom ključa za uporabo v aeronavtiki. Klasifikacija: 900 MPa/235 °C.
General Information
Relations
Overview
EN 3228:2022 - "Aerospace series - Nuts, hexagonal, plain, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C" - defines the characteristics, designation and procurement requirements for reduced‑height plain hexagonal nuts used in aerospace applications. The standard covers geometry, materials, surface treatment, marking and quality requirements for nuts with MJ thread sizes (approx. MJ4 to MJ24) classified for a tensile strength level of 900 MPa and a maximum service temperature of 235 °C (surface‑treatment dependent).
Key topics and technical requirements
- Configuration, dimensions and masses: Dimensions and tolerances follow ISO 9609 (apply after surface treatment). Form and position tolerances are specified by ISO 8788. Details such as chamfers, edge breaks (0.1–0.4 mm) and optional features are covered.
- Materials: Acceptable steels are referenced to aerospace material standards (EN 2205, EN 2438, EN 2448, EN 3513 or TR 3823) consistent with the 900 MPa class.
- Surface treatment: Cadmium plating per EN 2133 is required. Minimum plating thickness is 5 µm on threads and all surfaces contactable by a 20 mm diameter ball; other surfaces require continuous cadmium plating.
- Designation and marking: Includes standardized designation blocks (originator code I9005 where needed), hole codes (e.g., lockwire holes code "H"), and marking styles by diameter ranges per EN 2424.
- Technical specification and testing: Procurement follows ISO 9139 with specific exceptions (tensile load test not applicable for reduced‑height nuts). Manufacturer approval and approval criteria reference aerospace quality systems.
- Quality management: Manufacturers must operate approved aerospace production organizations and maintain an aerospace quality management system (e.g., EN 9100).
Practical applications
- Use case: fasteners for aircraft structural assemblies, secondary structures, and equipment where compact, high‑strength nuts are required.
- Beneficiaries: aerospace design engineers, fastener manufacturers and distributors, procurement/specification writers, quality and compliance teams.
- Benefits: ensures interchangeability, traceability, corrosion protection (cadmium), and compatibility with MJ thread systems and established aerospace procurement processes.
Who should use this standard
- Aerospace OEMs and Tier suppliers specifying nuts for airframe and systems
- Fastener manufacturers producing MJ‑thread hex nuts with cadmium plating
- Procurement and quality assurance teams enforcing part acceptance criteria and supplier approvals
Related standards
Relevant referenced documents include EN 2133, EN 2205, EN 2438, EN 2448, EN 3513, ISO 9609, ISO 8788, ISO 5855‑2, ISO 9139 and EN 9100 - consult these for detailed material, dimensional, plating and quality system requirements.
Frequently Asked Questions
EN 3228:2022 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, hexagonal, plain, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C". This standard covers: This document specifies the characteristics of plain hexagonal nuts, reduced height, normal across flats, in steel, cadmium plated, for aerospace applications. Classification: 900 MPa/235 °C.
This document specifies the characteristics of plain hexagonal nuts, reduced height, normal across flats, in steel, cadmium plated, for aerospace applications. Classification: 900 MPa/235 °C.
EN 3228:2022 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3228:2022 has the following relationships with other standards: It is inter standard links to EN 3228:2010, EN 3238:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 3228:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2022
Nadomešča:
SIST EN 3228:2010
Aeronavtika - Matice, šestrobe, drsne, z normalnim zevom ključa, iz jekla,
kadmirane - Klasifikacija: 900 MPa (pri temperaturi okolice)/235 °C
Aerospace series - Nuts, hexagonal, plain, reduced height, normal across flats, in steel,
cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C
Luft- und Raumfahrt - Flache Sechskantmuttern mit reduzierter Höhe, normale
Schlüsselweite, aus Stahl, verkadmet - Klasse: 900 MPa (bei Raumtemperatur)/235 °C
Série aérospatiale - Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux,
en acier, cadmiés - Classification : 900 MPa (à température ambiante)/235 °C
Ta slovenski standard je istoveten z: EN 3228:2022
ICS:
21.060.20 Matice Nuts
49.025.10 Jekla Steels
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 3228
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 49.030.30 Supersedes EN 3228:2010
English Version
Aerospace series - Nuts, hexagonal, plain, reduced height,
normal across flats, in steel, cadmium plated -
Classification: 900 MPa (at ambient temperature)/235 °C
Série aérospatiale - Écrous hexagonaux ordinaires, Luft- und Raumfahrt - Flache Sechskantmuttern mit
hauteur réduite, surplats normaux, en acier, cadmiés - reduzierter Höhe, normale Schlüsselweite, aus Stahl,
Classification : 900 MPa (à température ambiante)/235 verkadmet - Klasse: 900 MPa (bei
°C Raumtemperatur)/235 °C
This European Standard was approved by CEN on 17 January 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3228:2022 E
worldwide for CEN national Members.
Contents Page
European Foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration — Dimensions — Masses . 5
4.2 Materials . 8
4.3 Surface treatment . 8
5 Designation. 8
6 Marking . 8
7 Technical specification . 9
8 Quality management system . 9
Bibliography . 10
European Foreword
This document (EN 3228:2022) 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, 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 September 2022 and conflicting national standards
shall be withdrawn at the latest by September 2022.
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 organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey an
...
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