EN 4702-02:2017

Overview

EN 4702-02:2017 is a European standard developed by CEN that specifies the requirements and system components for quick release fastening systems in aerospace applications. This part of the Aerospace series focuses on the spring clamp stud combination designed for use in fuselage interior equipment and other non-structural or lining applications. The standard ensures compatibility, reliability, and safety of fastening elements in secondary structural zones of aircraft, improving efficiency and maintenance procedures in aerospace manufacturing and repair.

Key Topics

• Component System Definition: The standard defines the spring clip pin family, detailing specifications for studs, spring clamps, and retaining washers that work together as a quick release fastening system.
• Material Specifications: Components are made from materials such as alloy steel (EN 10132-4), stainless steel (EN 10088-3 and EN 10151), and high-performance plastics (PA 66 - GF30), ensuring durability and corrosion resistance critical for aerospace environments.
• Design and Compatibility: The document includes technical tolerances and representations for the studs and spring clamps to guarantee precise fit and functional release mechanisms.
• Installation Guidance: Provides example installations demonstrating the integration of spring clamp stud combinations with associated components like retaining washers for non-structural aerospace applications.
• Normative References: EN 4702-02:2017 references related standards like EN 4702-03 (stud quick-release and locking), EN 4702-04 (spring clamps), and EN 4702-05 (retaining washers), creating a cohesive framework for fastening systems in aerospace.

Applications

• Fuselage Interior Equipment: Joint fastening solutions suitable for securing panels, lining, and other interior systems within commercial, military, and private aircraft.
• Non-Structural Zones: Ideal for areas of the aircraft where fastening systems are not part of the primary load-bearing structure but require reliable and frequent assembly/disassembly capability.
• Secondary Structural Areas: Used in regions that are secondary to the main aircraft structure but still require strong, fast, and maintenance-friendly attachment methods.
• Maintenance and Repair Operations: Facilitates quick release and reinstallation of aircraft interior components, reducing aircraft downtime and improving accessibility for technicians.
• Aerospace Manufacturing: Standardized fasteners allow for streamlined production processes and interchangeability of parts across different manufacturers and aerospace platforms.

Related Standards

To fully comply with aerospace quick release fastening requirements, EN 4702-02:2017 should be used in conjunction with these relevant standards:

• EN 4702-03 – Aerospace series Part 03: Stud - quick-release and locking mechanisms.
• EN 4702-04 – Aerospace series Part 04: Spring clamps for non-structural fastening.
• EN 4702-05 – Aerospace series Part 05: Retaining washers to secure spring clamps and studs.
• EN 10088-3 – Stainless steels technical delivery conditions, covering corrosion-resistant steels used in aerospace fasteners.
• EN 10132-4 – Cold rolled narrow steel strip for heat treatment, specifying spring steel requirements.
• EN 10151 – Stainless steel strip for springs, essential for the production of spring clamps.
• EN ISO 10683 – Fasteners with zinc flake coatings to enhance corrosion resistance.

By adhering to EN 4702-02:2017, aerospace manufacturers and maintenance teams benefit from standardized spring clamp stud combinations that enhance safety, reliability, and operational efficiency for non-structural and lining aerospace applications. The standard’s clear guidelines on materials, installation, and component interaction support the critical demands of the aerospace industry for quick release fastening systems.