EN 3904:2017

Aerospace series - Washers, wire locking in aluminium alloy, anodized

This European Standard specifies the characteristics of wire locking washers in aluminium alloy, anodized for maximum operating temperature 120 °C for aerospace applications.

Luft- und Raumfahrt - Scheiben, Drahtsicherung aus Aluminiumlegierung, anodisiert

Série aérospatiale - Pattes d’ancrage, en alliage d’aluminium, anodisées

Aeronavtika - Podložke, zapiralne žice iz aluminijeve zlitine, anodizirane

Ta evropski standard določa lastnosti podložk zapiralnih žic iz aluminijeve zlitine, anodiziranih za najvišjo delovno temperaturo 120 °C v aeronavtiki.

General Information

• Status: Published
• Publication Date: 21-Nov-2017
• Withdrawal Date: 30-May-2018
• ICS: 49.030.50 - Washers and other locking elements
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 1 - Parts of Mechanical Systems
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Nov-2017
• Completion Date: 22-Nov-2017
• Ref Project: SIST EN 3904:2018 - Aerospace series - Washers, wire locking in aluminium alloy, anodized

Overview

EN 3904:2017 is a European aerospace standard that defines the characteristics of wire locking washers in aluminium alloy, anodized. It applies to washers intended for aerospace use with a maximum operating temperature of 120 °C. The standard specifies configuration, dimensions, masses, materials and surface treatment to ensure consistent performance and interchangeability across aerospace applications.

Key Topics

• Scope and temperature rating: Wire locking washers for aerospace service, rated up to 120 °C.
• Configuration, dimensions and masses: Dimensions and tolerances are given in millimetres and apply after surface treatment. Diameter codes range (examples in the standard) from code 030 up to 140 with corresponding geometries and approximate masses.
• Materials: Acceptable aluminium alloys are referenced to EN 2090 or the prEN 2091 series (aluminium alloy specifications). Materials selection is constrained to those listed in the standard.
• Surface treatment: Sulphuric acid anodizing per EN 2284; specified film thickness values apply prior to final surface treatment.
• Designation and marking: Product designation rules are provided (including an optional code I9005) and marking follows EN 2424 (style G) for aerospace products.
• Quality assurance: Conformance and quality management are linked to EN 9100 requirements for aviation, space and defense organizations.

Applications

EN 3904:2017 is intended for use by organizations involved in the design, manufacture, procurement and maintenance of aerospace hardware where wire-locking washers are employed to prevent fastener rotation or loosening. Typical users include:

• Aerospace component designers and mechanical engineers specifying locking elements.
• Fastener and hardware manufacturers producing anodized aluminium washers.
• Procurement and quality teams ensuring supplier conformity to aerospace standards.
• Maintenance, repair and overhaul (MRO) operations selecting replacement parts that meet aircraft/material specifications.

Practical benefits include standardized dimensions and treatments to improve interchangeability, corrosion resistance through anodizing, and traceable marking and quality systems to support certification and safety requirements.

Related Standards

• EN 2090 / prEN 2091 (aluminium alloy sheet/strip specifications)
• EN 2284 (sulphuric acid anodizing of aluminium)
• EN 2424 (marking of aerospace products)
• EN 9100 (quality management for aviation, space and defense)

EN 3904:2017 was prepared under ASD‑STAN/CEN and is intended for adoption as a national standard across CEN member countries, supporting harmonized use of wire locking washers in aerospace systems.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Podložke, zapiralne žice iz aluminijeve zlitine, anodiziraneLuft- und Raumfahrt - Scheiben, Drahtsicherung aus Aluminiumlegierung, anodisiertSérie aérospatiale - Pattes d’ancrage, en alliage d’aluminium, anodiséesAerospace series - Washers, wire locking in aluminium alloy, anodized49.030.50Podložke in drugi blokirni elementiWashers and other locking elements49.025.20AluminijAluminiumICS:Ta slovenski standard je istoveten z:EN 3904:2017SIST EN 3904:2018en,fr,de01-februar-2018SIST EN 3904:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3904
November
t r s y ICS
v {ä r u rä w r English Version
Aerospace series æ Washersá wire locking in aluminium alloyá anodized Série aérospatiale æ Pattes d 5ancrageá en alliage d 5aluminiumá anodisées
Luftæ und Raumfahrt æ Scheibená Drahtsicherung aus Aluminiumlegierungá anodisiert This European Standard was approved by CEN on
v September
t r s yä
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 Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United 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 y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
u { r vã t r s y ESIST EN 3904:2018
...