Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 120 °C

This European Standard specifies the characteristics of hexagonal nuts, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated.
Classification: 900 MPa  / 120 °C

Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd mit Plastikring, mit normaler Schlüsselweite, aus legiertem Stahl, verkadmet - Klasse: 900 MPa (bei Raumtemperatur) / 120 °C

Série aérospatiale - Écrous hexagonaux, à freinage interne par bague plastique, hauteur normale, surplats normaux, en acier allié, cadmiés - Classification : 900 MPa (à température ambiante) / 120 °C

Aeronavtika - Matice, šestrobe, samovarovalne s plastičnim obročem, normalno visoke, normalno prečno ploske, iz jeklene litine, kadmirane - Klasifikacija: 900 MPa (pri temperaturi okolice)/120 °C

Ta evropski standard določa lastnosti šestrobih matic, samovarovalnih s plastičnim obročem, normalne višine, normalno prečno ploskih, iz jeklene litine, kadmiranih.
Klasifikacija: 900 MPa/120 °C

General Information

Status
Published
Publication Date
20-Dec-2016
Withdrawal Date
29-Jun-2017
ICS
49.030.30 - Nuts
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 3 - Mechanical
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
21-Dec-2016
Completion Date
21-Dec-2016
Ref Project
SIST EN 4309:2017 - Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 120 °C

Overview

EN 4309:2016 is a CEN aerospace standard that defines the characteristics, dimensions and technical requirements for hexagon nuts self‑locking by plastic ring, normal height and normal across flats, made from alloy steel and cadmium plated. These nuts are classified 900 MPa / 120 °C, meaning a minimum tensile stress capability of 900 MPa at ambient temperature and a maximum service temperature of 120 °C (the temperature limit is governed by the plastic locking ring). The standard is intended for aerospace applications and is implemented as a European national standard.

Key topics and requirements

  • Product scope: Hexagonal nuts with internal plastic (polyamide 6.6) locking ring; alloy steel threaded element.
  • Classification: 900 MPa (ambient) - minimum tensile stress the nut must withstand; 120 °C - maximum temperature without permanent loss of properties (conditioned by the plastic ring).
  • Dimensions & tolerances: Dimension series and thread definitions reference ISO 5855‑2; tolerances of form and position reference ISO 8788. Dimensions and tolerances are expressed in millimetres and apply after surface treatment.
  • Material references: Threaded element per TR 3823; plastic ring material specified as polyamide 6.6.
  • Surface treatment: Cadmium plating per EN 2133 with minimum deposits specified (e.g., ≥5 µm on threads and surfaces that contact a 20 mm diameter ball; continuous deposit on other surfaces).
  • Marking: Marking style follows EN 2424 (style N); designation format specified (standard number + diameter code).
  • Quality and approval: Manufacturer approval and quality management per EN 9100; product qualification procedures per EN 9133. Technical specification follows ISO 5858 except where EN 4309 specifies alternatives.
  • Manufacturing details: Removal of sharp edges (0.1–0.4 mm) and allowable surface texture notes are included.

Applications and who uses it

  • Aerospace OEMs and suppliers specifying fasteners for airframe, avionics and structural applications where reliable locking and corrosion protection are needed.
  • Fastener manufacturers producing self‑locking nuts to aerospace quality and plating requirements.
  • Design and mechanical engineers selecting threaded retention hardware for temperature‑limited assemblies.
  • Procurement, quality and certification teams ensuring purchased nuts meet EN 4309 designation, marking and acceptance criteria.
  • Maintenance and repair organizations replacing or qualifying parts for continued airworthiness.

Related standards

  • EN 2133 (cadmium plating)
  • EN 2424 (marking of aerospace products)
  • ISO 5855‑2 (MJ threads dimensions)
  • ISO 5858 / ISO 8788 (nuts specifications and tolerances)
  • EN 9100 / EN 9133 (quality and product qualification)
  • TR 3823 (materials for hexagonal nuts)

Keywords: EN 4309, aerospace nuts, self‑locking nut, plastic ring, cadmium plated, 900 MPa, 120 °C, hexagon nut, aerospace fasteners, ISO 5855-2, EN 2133.

Frequently Asked Questions

EN 4309:2016 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 120 °C". This standard covers: This European Standard specifies the characteristics of hexagonal nuts, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated. Classification: 900 MPa / 120 °C

This European Standard specifies the characteristics of hexagonal nuts, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated. Classification: 900 MPa / 120 °C

EN 4309:2016 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.

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Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 120 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4309:2016SIST EN 4309:2017en,fr,de01-marec-2017SIST EN 4309:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4309
December
t r s x ICS
v {ä r u rä u r English Version
Aerospace series æ Nutsá hexagoná selfælocking by plastic ringá normal heightá normal across flatsá in alloy steelá cadmium plated æ ClassificaSérie aérospatiale æ Écrous hexagonauxá à freinage interne par bague plastiqueá hauteur normaleá surplats normauxá en acier alliéá cadmiés æ Classification ã
{ r r
Luftæ und Raumfahrt æ Sechskantmutterná selbstsichernd mit Plastikringá mit normaler Schlüsselweiteá aus legiertem Stahlá verkadmet æ This European Standard was approved by CEN on
s s March
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v u r {ã t r s x ESIST EN 4309:2017

Page European foreword . 3 1 Scope . 4 2 Normative references . 4 3 Required characteristics . 4 4 Designation . 6 5 Marking . 7 6 Technical specification . 7
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