EN 3626:2006
(Main)Aerospace series - Nuts, hexagon, self-locking in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/235 °C
Aerospace series - Nuts, hexagon, self-locking in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/235 °C
This standard specifies characteristics of self-locking hexagonal nuts, with flange, in steel, cadmium plated, MoS2 lubricated.
Classification: 1 100 MPa ) / 235 °C ).
Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C
Diese Norm legt die Eigenschaften von selbstsichernden Sechskantmuttern mit Flansch aus Stahl, verkadmet, MoS2-geschmiert, fest.
Klasse: 1 100 MPa ) / 235 °C )
Série aérospatiale - Ecrous hexagonaux, à freinage interne, en acier, cadmiés, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiante)/235 °C
Aeronavtika - Matice, šestrobe, samozapiralne, jeklene, prevlečene s kadmijem, namazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C
General Information
- Status
- Published
- Publication Date
- 11-Jul-2006
- Withdrawal Date
- 30-Jan-2007
- 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 3626:2006 is a CEN/AeroSpace series standard that defines the characteristics of self‑locking hexagon nuts with flange made of steel, cadmium plated and MoS2 (molybdenum disulphide) lubricated. It applies to aerospace fasteners classified 1 100 MPa (minimum tensile stress at ambient temperature) / 235 °C (maximum service temperature). The standard sets dimensional, material, surface treatment, marking and quality system requirements for reliable, high‑strength self‑locking nuts used in aerospace assemblies.
Key Topics
- Scope and classification: Covers flange hexagon self‑locking nuts in steel, cadmium plated and MoS2 lubricated; classification 1100 MPa / 235 °C.
- Dimensions and tolerances: Dimensioning follows ISO 7995 (MJ threads) and tolerances of form/position per ISO 8788; dimensions apply after cadmium plating but before MoS2 treatment.
- Materials: Material selection guidance referenced to ASD Technical Report TR 3791 (materials for metal self‑locking nuts).
- Surface treatment: Cadmium plating in accordance with EN 2133 - minimum 5 µm on threads and on surfaces contacting a 20 mm diameter ball; continuous deposit required elsewhere. MoS2 dry lubricant coating per EN 2491.
- Identification & marking: Marking requirements follow EN 2424 (style N). Example designation: NUT EN3626-050 (standard number + diameter code).
- Quality & approval: Manufacturer approval and quality systems per EN 9100; product qualification per EN 9133. Technical procurement references ISO 5858 for self‑locking nuts where applicable.
Applications
- Aerospace structural and mechanical assemblies where secure, reusable fastening and predictable self‑locking performance are required.
- Use in airframes, engine mounts, landing gear subassemblies and other critical joints subject to vibration and high clamp loads.
- Specification used by: aerospace OEMs, tier‑1 suppliers, fastener manufacturers, procurement engineers, quality managers and inspection/test laboratories defining or verifying high‑strength plated, MoS2‑lubricated self‑locking nuts.
Related Standards
- EN 2133 - Cadmium plating of steels
- EN 2424 - Marking of aerospace products
- EN 2491 - MoS2 dry lubricants - coating methods
- EN 9100 / EN 9133 - Aerospace quality systems and qualification procedures
- ISO 5855‑2, ISO 5858, ISO 7995, ISO 8788 - Thread and dimensional/tolerance standards
- TR 3791 - Materials for metal self‑locking nuts
EN 3626 is essential when specifying aerospace series self‑locking hexagon nuts, ensuring consistent performance (1100 MPa class) and controlled surface protection/lubrication (cadmium + MoS2) for demanding aviation environments.
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Frequently Asked Questions
EN 3626:2006 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, hexagon, self-locking in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/235 °C". This standard covers: This standard specifies characteristics of self-locking hexagonal nuts, with flange, in steel, cadmium plated, MoS2 lubricated. Classification: 1 100 MPa ) / 235 °C ).
This standard specifies characteristics of self-locking hexagonal nuts, with flange, in steel, cadmium plated, MoS2 lubricated. Classification: 1 100 MPa ) / 235 °C ).
EN 3626:2006 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 3626:2006 has the following relationships with other standards: It is inter standard links to EN 9133:2018, EN 1870-17:2007/FprA2, EN 2491:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3626:2006 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.Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °CSérie aérospatiale - Ecrous hexagonaux, à freinage interne, en acier, cadmiés, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiante)/235 °CAerospace series - Nuts, hexagon, self-locking in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 3626:2006SIST EN 3626:2009en,de01-maj-2009SIST EN 3626:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3626
July 2006 ICS 49.030.30 English Version
Aerospace series - Nuts, hexagon, self-locking in steel, cadmium plated, MoS2 lubricated -Classification: 1 100 MPa (at ambient temperature)/235 °C
Série aérospatiale - Ecrous hexagonaux, à freinage interne, en acier, cadmiés, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiante)/235 °C
Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C This European Standard was approved by CEN on 9 March 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3626:2006: ESIST EN 3626:2009
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