EN 2648:2013

Aerospace series - Washers, concave, in alloy steel, cadmium plated

This standard specifies the characteristics of concave washers, in alloy steel, cadmium plated, maximum operating temperature 235 °C.
They are intended to be used with nuts to EN 2647.

Luft- und Raumfahrt - Scheiben, für Neigungsausgleich, aus legiertem Stahl, verkadmet

Série aérospatiale - Rondelles concaves, en acier allié, cadmiées

Aeronavtika - Podložke, vbočene (konkavne), iz legiranega jekla, kadmirane

General Information

• Status: Published
• Publication Date: 17-Dec-2013
• Withdrawal Date: 29-Jun-2014
• ICS: 49.030.50 - Washers and other locking elements
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 18-Dec-2013
• Completion Date: 18-Dec-2013
• Ref Project: SIST EN 2648:2014 - Aerospace series - Washers, concave, in alloy steel, cadmium plated

Relations

• Replaces: EN 2648:1995 - Aerospace series - Washers, concave, in alloy steel, cadmium plated
• Effective Date: 25-Dec-2013

Overview

EN 2648:2013 is a European Standard developed by CEN (European Committee for Standardization) that specifies the technical requirements for aerospace series concave washers made of alloy steel with a cadmium plating. These washers are designed to operate at temperatures up to 235 °C and are intended for use with hexagonal self-locking ball seat nuts according to EN 2647. Primarily utilized in aerospace and defense industries, the standard ensures consistent quality, performance, and interchangeability of concave washers that compensate for inclination during assembly.

Key Topics

• Material Specifications
  EN 2648 washers are manufactured from high-strength alloy steels:

  • FE-PL1502 (25CrMo4)
  • FE-PL1503 (35CrMo4)
    The steels meet tensile strength requirements of 1,250 to 1,400 MPa and hardness levels between 40 and 43 HRC, ensuring durability and resistance to mechanical stress.

• Surface Treatment
  The washers undergo cadmium plating with thickness between 8 µm and 14 µm, complying with EN 2133. This coating provides corrosion resistance critical for aerospace environments.

• Dimensional and Design Features
  The standard sets precise dimensions, tolerances, and mass values for washers (see Table 1 in the standard), aligned with corresponding nut diameter codes from EN 2647. Concave spherical form ensures reliable compensation for angular misalignment in fastened joints.

• Marking and Identification
  Washers are marked according to EN 2424, style F, including the diameter code for traceability and classification.

• Qualification and Testing
  Compliance and qualification requirements refer to EN 2647, which details testing protocols ensuring washers meet mechanical and environmental performance criteria.

Applications

EN 2648 concave washers are critical components in aerospace assemblies where precision fastening and load distribution are essential. Their applications include:

• Aerospace Fastening Systems
  Used with EN 2647 self-locking nuts to provide secure, vibration-resistant joints in aircraft structures and engine components.

• Inclination Compensation
  The concave design accommodates angular misalignments between mating surfaces, improving joint reliability and reducing stress concentrations.

• High-Temperature Environments
  Suitable for aerospace components exposed to temperatures up to 235 °C, maintaining mechanical integrity and corrosion resistance.

• Defense Industry
  Applied in military aircraft and aerospace defense hardware where stringent standards for safety and durability are mandatory.

Related Standards

Understanding EN 2648 often involves referencing complementary aerospace standards, including:

• EN 2647: Aerospace series nuts - hexagonal self-locking ball seat nuts in alloy steel, cadmium plated, designed for use with EN 2648 washers.
• EN 2133: Specifications for cadmium plating processes applicable to steel aerospace components.
• EN 2424: Marking requirements for aerospace products ensuring identification and traceability.
• EN 2542 & EN 3330/EN 2448: Standards defining chemical composition and mechanical properties of alloy steels used in washers and nuts.

Practical Value

Compliance with EN 2648:2013 assures aerospace manufacturers and suppliers of high-quality concave washers optimized for reliability, corrosion resistance, and dimensional precision. This standard supports critical fastening applications where safety and performance are paramount, thus facilitating international interoperability in aerospace assemblies. Proper use of EN 2648 washers enhances the longevity and structural integrity of aerospace fastener systems, contributing to overall airworthiness and operational safety.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NDGPLUDQHLuft- und Raumfahrt - Scheiben, für Neigungsausgleich, aus legiertem Stahl, verkadmetSérie aérospatiale - Rondelles concaves, en acier allié, cadmiéesAerospace series - Washers, concave, in alloy steel, cadmium plated49.030.50Podložke in drugi blokirni elementiWashers and other locking elementsICS:Ta slovenski standard je istoveten z:EN 2648:2013SIST EN 2648:2014en01-marec-2014SIST EN 2648:2014SLOVENSKI
STANDARDSIST EN 2648:20011DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2648
December 2013 ICS 49.030.50 Supersedes EN 2648:1995English Version
Aerospace series - Washers, concave, in alloy steel, cadmium plated
Série aérospatiale - Rondelles concaves, en acier allié, cadmiées
Luft- und Raumfahrt - Scheiben, für Neigungsausgleich, auslegiertem Stahl, verkadmet This European Standard was approved by CEN on 28 September 2013.
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 © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2648:2013 ESIST EN 2648:2014
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