EN 2648:2013
(Main)Aerospace series - Washers, concave, in alloy steel, cadmium plated
General Information
- Abstract
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.
- Status
- Published
- Publication Date
- 17-Dec-2013
- Withdrawal Date
- 29-Jun-2014
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2024
- Completion Date
- 09-Sep-2026
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.
Relations
- Effective Date
- 25-Dec-2013
- Effective Date
- 28-Jan-2026
Get Certified
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DEKRA North America
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Eagle Registrations Inc.
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Element Materials Technology
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Frequently Asked Questions
EN 2648:2013 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Washers, concave, in alloy steel, cadmium plated". This standard covers: 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.
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.
EN 2648:2013 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.
EN 2648:2013 has the following relationships with other standards: It is inter standard links to EN 2648:1995, EN 2647:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 2648:2013 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.