Aerospace series - Washers countersunk, load spreading - Heat resisting steel

This standard specifies the characteristics of heat resisting steel, countersunk, load spreading washers for use in aerospace applications at temperatures not exceeding 650 °C.
They are intended primarily for use under the head of bolts with strength classification up to 1 250 MPa. They are used to provide sufficient bearing area to prevent indentation of parent metals with low compressive strength at operating temperatures, thus ensuring no relaxation in the bolt load occurs.

Luft- und Raumfahrt - Scheiben, angesenkt, druckverteilend - Hochwarmfester Stahl

Diese Norm legt die Eigenschaften von angesenkten, druckverteilenden Scheiben aus hochwarmfestem Stahl zur Verwendung in der Luft- und Raumfahrt bei Temperaturen bis maximal 650 °C fest.
Die Scheiben sind hauptsächlich zum Einsatz unter dem Kopf von Schrauben mit einer Festigkeitsklasse von bis zu 1 250 MPa bestimmt. Sie werden angewendet, um eine ausreichend große Auflagefläche zu bieten, damit Vertiefungen auf Metallen mit niedriger Druckfestigkeit bei Betriebstemperatur vermieden werden, sodass keine Entspannung des Lastdrucks der Schraube eintritt.

Série aérospatiale - Rondelles fraisées de répartition - Acier résistant à chaud

Aeronavtika - Okrogle podložke, ugreznjene, porazdelitev obremenitve - Toplotnoodporno jeklo

General Information

Status
Published
Publication Date
19-Jun-2008
ICS
49.030.50 - Washers and other locking elements
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jun-2008
Due Date
10-Aug-2008
Completion Date
20-Jun-2008
Ref Project
EN 3016:2008 - Aerospace series - Washers countersunk, load spreading - Heat resisting steel

Overview

EN 3016:2008 - "Aerospace series - Washers countersunk, load spreading - Heat resisting steel" is a CEN standard that specifies the required characteristics for countersunk, load‑spreading washers made of heat‑resisting steel for aerospace use. These washers are intended for service temperatures up to 650 °C and for application under bolt heads with strength classification up to 1 250 MPa. The washers provide a larger bearing area to prevent indentation of soft parent metals at elevated temperatures and to avoid relaxation of bolt preload.

Key topics

  • Product type and purpose
    • Countersunk, load‑spreading washers for aerospace assemblies; fitted under bolt heads to spread load and prevent bearing failure.
  • Temperature and mechanical limits
    • Intended for operating temperatures not exceeding 650 °C and bolts up to 1 250 MPa strength classification.
  • Materials
    • Permitted steels are specified by referenced standards EN 2171 or EN 2175 (heat resisting steels/alloys).
  • Configuration, dimensions and masses
    • Geometry, nominal dimensions, tolerances and masses are defined (see Figure 1 and Table 1 in the standard); flatness variations are included in thickness tolerances.
  • Surface requirements
    • Surface roughness values apply before passivation; final surface treatment must be passivation in accordance with EN 2516.
  • Tolerances and manufacturing
    • For washers from sheet/strip (EN 2175) the roll‑over and fracture tolerances of ISO 4759‑3 can be applied.
  • Designation and marking
    • Formal designation format (e.g., “Washer, countersunk, load spreading EN 3016 - 070”) and packaging/marking style per EN 2424 (Style G); quantity must be declared.

Applications

  • Used by aerospace designers and mechanical engineers to:
    • Protect low‑compressive‑strength parent materials (e.g., heat‑sensitive alloys or thin sections) from indentation under bolted joints at elevated temperatures.
    • Maintain bolt preload and joint integrity in high‑temperature areas of aircraft propulsion systems, hot structures and thermal protection interfaces.
  • Typical users:
    • OEM aerospace fastener manufacturers, aircraft structural designers, maintenance/repair organizations, purchasing and quality assurance teams specifying compliant washers for high‑temperature assemblies.

Related standards

  • EN 2171 - Heat resisting steel FE‑PA 92 HT (bars)
  • EN 2175 - Heat resisting alloy FE‑PA2602 (sheet/strip)
  • EN 2516 - Passivation of corrosion resisting steel and decontamination of nickel base alloys
  • EN 2424 - Marking of aerospace products
  • ISO 4759‑3 - Tolerances for plain washers (roll over/fracture tolerances)

EN 3016:2008 is a practical specification for sourcing and producing countersunk, load‑spreading heat‑resisting washers that maintain bolted joint performance in high‑temperature aerospace environments.

Frequently Asked Questions

SIST EN 3016:2008 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Washers countersunk, load spreading - Heat resisting steel". This standard covers: This standard specifies the characteristics of heat resisting steel, countersunk, load spreading washers for use in aerospace applications at temperatures not exceeding 650 °C. They are intended primarily for use under the head of bolts with strength classification up to 1 250 MPa. They are used to provide sufficient bearing area to prevent indentation of parent metals with low compressive strength at operating temperatures, thus ensuring no relaxation in the bolt load occurs.

This standard specifies the characteristics of heat resisting steel, countersunk, load spreading washers for use in aerospace applications at temperatures not exceeding 650 °C. They are intended primarily for use under the head of bolts with strength classification up to 1 250 MPa. They are used to provide sufficient bearing area to prevent indentation of parent metals with low compressive strength at operating temperatures, thus ensuring no relaxation in the bolt load occurs.

SIST EN 3016:2008 is classified under the following ICS (International Classification for Standards) categories: 49.030.50 - Washers and other locking elements. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 3016:2008 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)


SLOVENSKI STANDARD
01-september-2008
Aeronavtika - Okrogle podložke, ugreznjene, porazdelitev obremenitve -
Toplotnoodporno jeklo
Aerospace series - Washers countersunk, load spreading - Heat resisting steel
Luft- und Raumfahrt - Scheiben, angesenkt, druckverteilend - Hochwarmfester Stahl
Série aérospatiale - Rondelles fraisées de répartition - Acier résistant à chaud
Ta slovenski standard je istoveten z: EN 3016:2008
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.

EUROPEAN STANDARD
EN 3016
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2008
ICS 49.030.50
English Version
Aerospace series - Washers countersunk, load spreading - Heat
resisting steel
Série aérospatiale - Rondelles fraisées de répartition - Acier Luft- und Raumfahrt - Scheiben, angesenkt,
résistant à chaud druckverteilend - Hochwarmfester Stahl
This European Standard was approved by CEN on 12 December 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3016:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope.4
2 Normative references.4
3 Required characteristics.4
3.1 Configuration, dimensions, tolerances, masses.4
3.2 Materials.4
3.3 Surface roughness.4
3.4 Surface treatment.4
4 Designation.6
5 Marking.6

Figures
Figure 1 — Configuration. 5

Tables
Table 1 — Dimensions and masses. 5

Foreword
This document (EN 3016:2008) 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 o
...

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