EN 3230:2001
(Main)Aerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 235 °C
Aerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 235 °C
This standard specifies the characteristics of hexagonal slotted / castellated nuts, reduced height, normal across flats, in steel, cadmium plated.
Classification: 900 MPa ) / 235 °C )
Luft- und Raumfahrt - Flache Kronenmuttern mit normaler Schlüsselweite, aus Stahl, verkadmet - Klasse: 900 MPa (bei Raumtemperatur) / 235 °C
Diese Norm legt die Eigenschaften von flachen Kronenmuttern mit normaler Schlüsselweite, aus Stahl, verkadmet, fest.
Klasse: 900 MPa ) / 235 °C )
Série aérospatiale - Écrous hexagonaux à créneaux, hauteur réduite, surplats normaux, en acier, cadmiés - Classification : 900 MPa (à température ambiante) / 235 °C
La présente norme spécifie les caractéristiques des écrous hexagonaux à créneaux, hauteur réduite, surplats normaux, en acier, cadmiés.
Classification : 900 MPa ) / 235 °C
Aerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 Mpa (at ambient temperature) / 235 oC
General Information
- Status
- Published
- Publication Date
- 19-Jun-2001
- Withdrawal Date
- 30-Dec-2001
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 31-May-2017
- Completion Date
- 21-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3230:2001 (CEN) is an aerospace series standard that specifies the characteristics of hexagonal slotted / castellated nuts, reduced height, normal across flats, in steel, cadmium plated. The standard assigns these nuts a classification of 900 MPa (at ambient temperature) / 235 °C, and establishes dimensional, material, surface treatment and marking rules applicable to aerospace fasteners.
Key topics
- Scope and classification
- Applies to reduced-height hexagon castellated nuts in steel, cadmium plated.
- Classification: 900 MPa (minimum tensile capability at ambient temperature) and maximum service temperature 235 °C (conditioned by cadmium plating).
- Dimensions and tolerances
- Dimensional requirements reference ISO 9618 and are given in millimetres (apply after surface treatment). Diameter codes (e.g., 040–240) are used; example designation format shown as EN3230-080.
- Threads and compatibility
- Relates to MJ threads and limit dimensions per ISO 5855-2. Tolerances of form and position follow ISO 8788.
- Materials and surface treatment
- Nuts are steel with cadmium plating; surface treatment requirements follow EN 2133 (plating requirements and minimum deposit as specified in that standard).
- Form, finish and marking
- Details on slot geometry, removal of sharp edges, and marking conventions are included (including optional insertion of code I9005 when necessary). Split-pin compatibility refers to EN 2367.
- Quality and procurement
- Technical specification references ISO 9139 for procurement; manufacturer approval and QA aspects reference EN 2000.
Applications
- Used where a castellated (slotted) nut is required for positive locking with a split pin - common in aerospace assemblies where retention under vibration and predictable clamp characteristics are critical.
- Typical users: aerospace design engineers, fastener manufacturers and suppliers, procurement specialists, quality/inspection teams, and maintenance/overhaul organizations specifying or approving control and structural fasteners.
Practical value
- Ensures interchangeability and traceability of critical locking nuts across the aerospace supply chain.
- Provides a clear tensile and temperature classification (900 MPa / 235 °C) so designers can select nuts compatible with bolt strength and operating environment.
- Harmonizes dimensions, surface finish and marking for procurement and quality assurance.
Related standards
- ISO 5855-2 (MJ threads dimensions)
- ISO 8788 (tolerances of form and position)
- ISO 9139 (procurement specification)
- ISO 9618 (related nut dimensions)
- EN 2133 (cadmium plating)
- EN 2367 (split pins)
- EN 2424 (marking)
- EN 2000 (manufacturer approval / QA)
- TR 3823 (materials for plain and slotted hexagonal nuts)
Keywords: EN 3230:2001, aerospace nuts, hexagon slotted castellated nut, reduced height, cadmium plated, 900 MPa, 235 °C, MJ threads, fastener standard, aerospace fasteners.
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Frequently Asked Questions
EN 3230:2001 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 235 °C". This standard covers: This standard specifies the characteristics of hexagonal slotted / castellated nuts, reduced height, normal across flats, in steel, cadmium plated. Classification: 900 MPa ) / 235 °C )
This standard specifies the characteristics of hexagonal slotted / castellated nuts, reduced height, normal across flats, in steel, cadmium plated. Classification: 900 MPa ) / 235 °C )
EN 3230:2001 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 3230:2001 has the following relationships with other standards: It is inter standard links to EN 9133:2018, EN 4501:2006, EN 3740:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3230:2001 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 Mpa (at ambient temperature) / 235 oCLuft- und Raumfahrt - Flache Kronenmuttern mit normaler Schlüsselweite,aus Stahl, verkadmet - Klasse: 900 MPa (bei Raumtemperatur) / 235 °CSérie aérospatiale - Écrous hexagonaux a créneaux, hauteur réduite, surplats normaux, en acier, cadmiés - Classification : 900 MPa (a température ambiante) / 235 °CAerospace series - Nuts, hexagon, slotted / castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 3230:2001SIST EN 3230:2002en01-januar-2002SIST EN 3230:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3230June 2001ICS 49.030.30English versionAerospace series - Nuts, hexagon, slotted/castellated, reducedheight, normal across flats, in steel, cadmium plated,Classification: 900 MPa (at ambient temperature)/235°CSérie aérospatiale - Ecrous hexagonaux à créneaux,hauteur réduite, surplats normaux, en acier, cadmiés -Classification: 900 MPa (à température ambiante)/235°CLuft- und Raumfahrt - Flache Kronenmuttern mit normalerSchlüsselweite, aus Sthal, verkadmet - Klasse: 900 MPa(bei Raumtemperatur)/235°CThis European Standard was approved by CEN on 28 February 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3230:2001 ESIST EN 3230:2002
Page 2EN 3230:2001ForewordThis European Standard has been prepared by the European Association of Aerospace Manufacturers(AECMA).After inquiries and votes carried out in accordance with the rules of this Association, this Standard hasreceived the approval of the National Associations and the Official Services of the member countries ofAECMA, prior to its presentation to CEN.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by December 2001, and conflicting national standards shall bewithdrawn at the latest by December 2001.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.SIST EN 3230:2002
Page 3EN 3230:20011ScopeThis standard specifies the characteristics of hexagonal slotted / castellated nuts, reduced height, normalacross flats, in steel, cadmium plated.Classification: 900 MPa 1) / 235 °C 2)2Normative referencesThis European Standard incorporates by dated or undated reference provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications apply tothis European Standard only when incorpo
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