EN 2811:2016

Aerospace series - Nuts, hexagon, slotted/ castellated in steel cadmium plated - Classification: 1 100 MPa/235 °C

This European Standard specifies the characteristics of steel, cadmium plated hexagonal nuts, with an upper portion slotted or castellated normal height, normal across flats.
These nuts are intended for use in aircraft assemblies subjected principally to shear loading.
They are intended to be used with threaded parts of 1 100 MPa (this strength level applies at ambient temperature) tensile strength classification and split pins to EN 2367.
The cadmium plating restricts the application to temperatures not exceeding 235 °C.

Luft- und Raumfahrt - Flache Kronenmuttern aus Stahl, verkadmet - Klasse: 1 100 MPa/235 °C

Série aérospatiale - Écrous hexagonaux à créneaux en acier cadmié - Classification: 1 100 MPa/235 °C

Aeronavtika - Matice, šestrobe, kronske, jeklene, kadmirane - Klasifikacija: 1100 MPa/235 °C

Ta evropski standard določa lastnosti jeklenih, kadmiranih šestrobih matic, s kronskim zgornjim delom normalne višine, normalno prečno ploskih.
Te matice so namenjene za uporabo v sestavih letal, ki so izpostavljeni predvsem strižni obtežbi.
Namenjene so za uporabo z veznimi deli v skladu s klasifikacijo natezne trdnosti 1100 MPa 1) in razcepkami v skladu s standardom EN 2367.
Kadmiranje omejuje uporabo na temperature, ki ne presegajo 235 °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 2811:2017 - Aerospace series - Nuts, hexagon, slotted/ castellated in steel cadmium plated - Classification: 1 100 MPa/235 °C

Overview

EN 2811:2016 is a European standard developed by CEN that specifies the requirements for steel, cadmium plated hexagonal nuts with slotted or castellated upper portions. These nuts are designed primarily for aerospace applications, particularly aircraft assemblies subjected to shear loading. The nuts comply with high tensile strength classifications (1 100 MPa at ambient temperature) and are intended to be used alongside split pins as per EN 2367 standards.

Cadmium plating enables corrosion resistance but limits the operational temperature to a maximum of 235 °C. This combination of steel material and cadmium plating ensures reliability in demanding aerospace environments.

Key Topics

• Material and Strength
  The nuts are made from steel conforming to EN 2205, EN 2438, EN 2444, or EN 2448, delivering a tensile strength of 1 100 MPa suitable for aerospace structural integrity.

• Dimensions and Configuration
  Specifications include normal height and across flats dimensions, with detailed tolerances defined according to ISO 4147 and ISO 8788. The nuts feature a slotted/castellated upper part allowing the use of split pins for secure locking.

• Surface Treatment
  Cadmium plating is applied in accordance with EN 2133 to enhance corrosion resistance, with a minimum thickness of 5 µm on thread surfaces and continuous coverage on all contact areas.

• Temperature Limit
  The cadmium plating restricts use to applications where temperatures do not exceed 235 °C, ensuring compatibility with aerospace environmental conditions.

• Marking and Traceability
  Marking requirements follow EN 2424; nuts must be clearly identified by diameter code and manufacturer marks to guarantee traceability in aerospace assemblies.

• Quality Assurance
  Manufacturing and quality control align with EN 9100 and EN 9133, aerospace standards ensuring product qualification, consistent performance, and supplier approval.

Applications

• Aircraft Assemblies
  These slotted hexagonal nuts are predominantly used in aircraft structures where components are subjected to shear forces, providing secure fastening through the use of split pins.

• Aerospace Fastening Systems
  Situations requiring high tensile strength fasteners with corrosion resistance and reliable locking mechanisms commonly employ nuts standardized by EN 2811:2016.

• Maintenance and Repair
  The standardization allows aerospace engineers and maintenance teams to select nuts that meet stringent mechanical, material, and dimensional requirements, ensuring safety and compliance.

• Compatibility with Threaded Parts
  Nuts are intended for use with threaded elements classified at 1 100 MPa tensile strength, ensuring mechanical compatibility and load-bearing effectiveness.

Related Standards

• EN 2367 – Aerospace series split pins in steel, used in conjunction with these nuts for safety locking.
• EN 2133 – Specifies cadmium plating requirements on aerospace steel components.
• ISO 4147 – Defines dimensions for hexagonal slotted nuts with MJ threads, supporting dimensional compliance.
• EN 2424 – Marking of aerospace products, ensuring traceability and identification consistency.
• EN 9100 – Quality Management Systems requirements specifically for aviation, space, and defense organizations.
• EN 9133 – Qualification procedure for aerospace standard products to ensure quality and reliability.
• ISO 8788 – Specifications on tolerances of form and position for aerospace nuts.

---

Keywords: EN 2811:2016, aerospace nuts, hexagon nuts, slotted castellated nuts, steel cadmium plated nuts, aerospace fasteners, shear loading, aircraft assembly nuts, tensile strength 1100 MPa, aerospace standards, cadmium plating temperature limit, aerospace quality management

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Matice, šestrobe, kronske, jeklene, kadmirane - Klasifikacija: 1100 MPa/235 °CLuft- und Raumfahrt - Flache Kronenmuttern aus Stahl, verkadmet - Klasse: 1 100 MPa/235 °CSérie aérospatiale - Écrous hexagonaux à créneaux en acier cadmié - Classification: 1 100 MPa/235 °CAerospace series - Nuts, hexagon, slotted/ castellated in steel cadmium plated - Classification: 1 100 MPa/235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 2811:2016SIST EN 2811:2017en,fr,de01-marec-2017SIST EN 2811:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2811
December
t r s x ICS
v {ä r u rä u r English Version
steel cadmium plated æ ClassiSérie aérospatiale æ Écrous hexagonaux à créneaux en
Luftæ und Raumfahrt æ Flache Kronenmuttern aus Stahlá This European Standard was approved by CEN on
v 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
t z s sã t r s x ESIST EN 2811:2017
...