EN 2913:1999

Overview

EN 2913:1999 is a CEN aerospace series standard that specifies the characteristics of flat washers, large diameter, manufactured in steel and cadmium plated for use in aerospace environments. The standard covers washers intended for a maximum operating temperature of 235°C and focuses on characteristics that ensure consistent performance in demanding assemblies.

This standard applies to components used in aerospace fastenings where increased bearing area, dimensional consistency and corrosion protection are required. It is intended to help designers, procurement teams and quality engineers select and verify washer products that meet recognized industry expectations.

Key Topics

• Scope and purpose: Defines the intended application domain-large-diameter flat washers made of steel with cadmium plating for aerospace use up to 235°C.
• Material and finish: Specifies that washers are steel and receive a cadmium plating finish to improve corrosion resistance in relevant service environments.
• Performance emphasis: Focus on dimensional control, material integrity and surface treatment to support reliable load distribution in bolted assemblies.
• Compatibility: Addresses use with typical aerospace fasteners where washer geometry and plating must be compatible with mechanical and environmental requirements.

Applications

EN 2913:1999 washers are applicable where larger bearing surfaces are needed to spread load and reduce stress concentration around fastened joints. Typical practical applications include:

• Structural and secondary assemblies in aircraft and aerospace systems where load distribution is critical.
• Areas requiring corrosion-resistant hardware where cadmium plating provides sacrificial protection and improved durability under specified conditions.
• Installations subject to elevated temperatures up to 235°C, where material selection and finish must withstand thermal exposure.

Benefits of conforming to EN 2913:1999 include:

• Improved joint reliability through consistent washer geometry and steel material properties.
• Enhanced corrosion protection from cadmium plating, aiding longevity in harsh environments.
• Design confidence by referencing a recognized aerospace standard during specification and procurement.

Related Standards

When specifying or verifying washers to EN 2913:1999, consider cross-referencing other aerospace and fastener standards for complementary requirements, such as standards covering bolts, screws, locking elements and general corrosion protection practices. Relevant topics include fastener dimensions, surface treatments, testing methods and material traceability.

For procurement teams and engineers, EN 2913:1999 provides a focused specification for large flat steel washers with cadmium plating, delivering practical value in aerospace fastening design, quality control and maintenance planning.