FprEN 2948
(Main)Aerospace series - Washers, tab, in heat resisting steel, passivated
General Information
- Abstract
This document specifies the characteristics of tab washers, in heat resisting steel, passivated, for maximum operating temperature 650 °C, for aerospace applications.
Their use under hexagon head bolts is conditional upon the user accepting the possibility of some interference.
- Status
- Not Published
- Publication Date
- 03-Mar-2027
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3/S 2 - Fasteners
- Current Stage
- 4599 - Dispatch of FV draft to CMC - Finalization for Vote
- Start Date
- 06-Aug-2026
- Completion Date
- 06-Aug-2026
Overview
FprEN 2948 is a draft European Standard developed by CEN that specifies the essential characteristics of tab washers made from heat-resisting, passivated steel for aerospace applications. Designed to operate in environments with temperatures up to 650 °C, these washers play a crucial role in securing fasteners under demanding conditions found in aircraft and aerospace assemblies. FprEN 2948 supersedes the earlier EN 2948:1996 standard, introducing updated terminology, quality assurance requirements, and guidance on testing and installation.
Key Topics
- Material Requirements: The standard mandates the use of heat resisting steel as per EN 2175 for manufacturing tab washers. This ensures reliability and strength in high-temperature environments.
- Surface Treatment: Passivation is required, conducted in accordance with EN 2516, to enhance corrosion resistance and overall durability of the washers.
- Dimensional Standards: Configuration, dimensions, and tolerances are precisely defined, promoting interchangeable use in aerospace designs and maintaining consistent performance.
- Identification and Marking: Washers must be marked following EN 2424 guidelines to ensure traceability and compliance in aerospace supply chains.
- Inspection and Testing: Visual inspections and bend tests are specified to confirm freedom from surface defects, as well as structural integrity during installation and repetitive bending.
- Quality Assurance: Manufacturing organizations are required to operate within a recognized quality management system, such as EN 9100, and adhere to relevant qualification procedures for aerospace components.
Applications
FprEN 2948 tab washers are primarily used in the aerospace industry where operating temperatures, mechanical stress, and reliability are critical factors. Practical applications include:
- Locking Mechanisms: Securing fasteners on aircraft engines, landing gear, and structural components to prevent loosening due to vibration or thermal expansion.
- Assembly of Aerospace Equipment: Ensuring safe and reliable assembly of parts in airplanes, helicopters, and space vehicles.
- High-Temperature Environments: Suitable for use in environments reaching up to 650 °C, making them ideal for engine mounts, exhaust systems, and other heat-exposed assemblies.
- Situations Involving Hexagon Head Bolts: Can be used under hexagon head bolts, although some interference may occur, which must be accepted by the user.
The tab design allows the washer to be anchored securely during installation, providing a reliable anti-rotation feature. The document also outlines installation examples and tests to verify the performance of the locking features.
Related Standards
For full compliance and integration, FprEN 2948 should be used alongside several key aerospace standards:
- EN 2175: Aerospace series - Specifies requirements for heat resisting alloy used in tab washers.
- EN 2424: Guidance for marking aerospace products, ensuring proper identification and traceability.
- EN 2516: Procedures for passivation and decontamination of steels and alloys in aerospace parts.
- EN 9100: Quality management requirements for aerospace production organizations.
- EN 9133: Qualification procedures for aerospace standard products.
- ICS 49.030.50: Covers washers and other locking elements within the international classification system.
By adhering to FprEN 2948 and these related standards, aerospace manufacturers and suppliers can ensure optimal safety, performance, and compliance across international projects, strengthening the reliability of aerospace fastener assemblies.
Relations
- Effective Date
- 23-Jul-2025
Get Certified
Connect with accredited certification bodies for this standard
DEKRA North America
DEKRA certification services in North America.
Eagle Registrations Inc.
American certification body for aerospace and defense.
Element Materials Technology
Materials testing and product certification.
Sponsored listings
Frequently Asked Questions
FprEN 2948 is a draft published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Washers, tab, in heat resisting steel, passivated". This standard covers: This document specifies the characteristics of tab washers, in heat resisting steel, passivated, for maximum operating temperature 650 °C, for aerospace applications. Their use under hexagon head bolts is conditional upon the user accepting the possibility of some interference.
This document specifies the characteristics of tab washers, in heat resisting steel, passivated, for maximum operating temperature 650 °C, for aerospace applications. Their use under hexagon head bolts is conditional upon the user accepting the possibility of some interference.
FprEN 2948 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.
FprEN 2948 has the following relationships with other standards: It is inter standard links to EN 2948:1996. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN 2948 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-februar-2026
Aeronavtika - Podložke, z zatičnim jezičkom, iz toplotno odpornega jekla,
pasivirane
Aerospace series - Washers, tab, in heat resisting steel, passivated
Luft- und Raumfahrt - Sicherungsblech mit Lappen aus hochwarmfestem Stahl,
passiviert
Ta slovenski standard je istoveten z: prEN 2948
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.
DRAFT
EUROPEAN STANDARD
prEN 2948
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2025
ICS 49.030.50 Will supersede EN 2948:1996
English Version
Aerospace series - Washers, tab, in heat resisting steel,
passivated
Luft- und Raumfahrt - Sicherungsblech mit Lappen aus
hochwarmfestem Stahl, passiviert
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 2948:2025 E
worldwide for CEN national Members.
prEN 2948:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
4.1 Configuration – Dimensions – Masses . 4
4.2 Material . 4
4.3 Surface treatment . 4
5 Designation . 6
6 Marking . 6
7 Inspections and tests . 6
7.1 Appearance . 6
7.2 Bend test . 6
8 Quality assurance . 6
Annex A (informative) Bending test and installation example . 7
Bibliography . 10
prEN 2948:2025 (E)
European foreword
This document (prEN 2948:2025) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 2948:1996.
This document includes the following significant technical changes with respect to EN 2948:1996:
— Clause 3 “Terms and definitions” added;
— Clause 8 “Quality assurance” updated;
— Annex A “Bending test and instal
...