SIST EN 6094:2016

Aerospace series - Washer, spring, countersunk

This standard specifies the dimensions, tolerances, required characteristics and mass of a countersunk spring washer for use in fuselage interior equipment and structural applications.

Luft- und Raumfahrt - Federsenkscheibe

Série aérospatiale - Rondelle, ressort, fraisée

Aeronavtika - Podložke, vzmetne, konično poglobljene

Ta standard določa dimenzije, tolerance, zahtevane lastnosti in maso konično poglobljenih vzmetnih podložk za uporabo v notranji opremi v trupu letala ter konstrukcijsko uporabo.

General Information

• Status: Published
• Publication Date: 11-Oct-2016
• ICS: 49.030.50 - Washers and other locking elements
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Sep-2016
• Due Date: 14-Nov-2016
• Completion Date: 12-Oct-2016
• Ref Project: EN 6094:2016 - Aerospace series - Washer, spring, countersunk

Overview

SIST EN 6094:2016 is a European standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and approved by CEN. It specifies the dimensional requirements, tolerances, material characteristics, and mass of countersunk spring washers designed specifically for aerospace applications. These washers are utilized in fuselage interior equipment and structural assemblies where reliable fastening and load distribution are critical for safety and performance.

The standard ensures compatibility and interchangeability of washers in aerospace manufacturing and maintenance, emphasizing corrosion resistance, mechanical strength, and strict quality control.

Key Topics

• Dimensions and Tolerances
  SIST EN 6094:2016 defines precise measurements including diameters, thickness, height, and mass tolerance for sizes 16, 18, and 19. All dimensions are measured in millimetres and comply with ISO 2768-1 general tolerances where not otherwise stated. Burr removal and edge finishing are mandatory to avoid assembly issues.

• Material Specifications and Surface Treatment
  The standard mandates corrosion resistant steels such as 1.4310 (per EN 10088-2) and Steel FE-PM3902 (X7CrNiAl17-7), both known for high tensile strength in the 1,100–1,300 MPa range. Surface treatments include passivation compliant with aerospace standards AMS 2700 or EN 2516 to enhance corrosion resistance critical for aircraft environments.

• Mechanical Performance
  Washers must withstand minimum preload forces (e.g., 3,000 N for size 16) without permanent deformation. The operational temperature range is defined from –55 °C to 150 °C, ensuring functionality in diverse aerospace climates.

• Installation Requirements
  The document details installation hole sizes and includes guidance on mounting with associated aerospace studs such as EN 6088 and EN 6105. It highlights use restrictions, for example, size 19 washers are not compatible with quick-release fastener systems (EN 6088, EN 6092, EN 6093, EN 6105).

• Marking and Identification
  Washers are marked according to EN 2424, style G, aiding traceability and compliance during manufacturing, inspection, and maintenance.

Applications

SIST EN 6094:2016 washers are integral to the aerospace industry, providing reliable spring action and load distribution in:

• Fuselage interior equipment attachments
• Structural assemblies subject to vibration and dynamic loads
• Aircraft maintenance involving replacement of standardized washers
• Aerospace manufacturing where conformity and interchangeability reduce assembly errors and improve safety

These washers contribute to the structural integrity of aircraft interiors and are required where precise mechanical performance and corrosion resistance are essential.

Related Standards

SIST EN 6094:2016 references and complements several other aerospace standards vital for fastener systems and corrosion protection:

• EN 2424 – Marking of aerospace products
• EN 2516 – Passivation of corrosion-resistant steels
• EN 2540 – Specifications for Steel FE-PM3902 (X7CrNiAl17-7)
• EN 6088 – Aerospace series studs
• EN 6092 / EN 6093 – Receptacles, floating types
• EN 6095 – Rotary fasteners technical specification
• EN 6105 – Studs with shoulder
• ISO 2768-1 – General tolerances for linear and angular dimensions
• SAE AMS 2700 – Passivation of corrosion-resistant steels

These interconnected standards ensure comprehensive guidance covering washers, studs, fasteners, and protective treatments for aerospace assemblies.

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Keywords: SIST EN 6094:2016, aerospace washer standard, countersunk spring washer, aerospace fasteners, fuselage interior equipment, corrosion resistant steel, aerospace washer dimensions, aerospace assembly standards, aerospace spring washer tolerance, aerospace structural components.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2016
$HURQDYWLND3RGORåNHY]PHWQHNRQLþQRSRJOREOMHQH
Aerospace series - Washer, spring, countersunk
Luft- und Raumfahrt - Federsenkscheibe
Série aérospatiale - Rondelle, ressort, fraisée
Ta slovenski standard je istoveten z: EN 6094:2016
ICS:
49.030.50 Podložke in drugi blokirni Washers and other locking
elementi elements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 6094
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2016
EUROPÄISCHE NORM
ICS 49.030.50
English Version
Aerospace series - Washer, spring, countersunk
Série aérospatiale - Rondelle, ressort, fraisée Luft- und Raumfahrt - Federsenkscheibe
This European Standard was approved by CEN on 11 March 2016.

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 CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 6094:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Requirements . 5
4 Designation . 6
5 Marking . 7
6 Technical specification . 7
7 Example of installation . 7
Bibliography . 8

European foreword
This document (EN 6094:2016) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2017, and conflicting national standards shall be
withdrawn at the latest by February 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations
...