kSIST FprEN 2944:2022

Overview

kSIST FprEN 2944:2022 is a European standard developed by CEN that specifies the characteristics and technical requirements for aerospace-grade inserts featuring MJ screw threads. These inserts utilize a self-locking, helical coil design made from corrosion-resisting steel FE-PA3004. Intended specifically for aerospace applications, this standard ensures reliability, precision, and performance of screw thread inserts subjected to demanding operational environments, including a maximum test temperature of 350 °C.

The document supersedes EN 2944:2018 and provides updated guidance on dimensions, tolerances, material specifications, marking, and quality management requirements. It serves as a crucial reference for manufacturers, assembly engineers, and quality assurance professionals working within the aerospace sector.

Key Topics

• Insert Configuration and Dimensions
  kSIST FprEN 2944:2022 defines detailed dimensions and tolerances for inserts with MJ screw threads, including the number of coils, installation hole lead-in faces, and locking features. These are crucial for achieving self-locking functionality and ensuring compatibility with aerospace fasteners. Dimensional data is presented in millimeters and aligned with related ISO standards such as ISO 5855-2.

• Material Specification
  The inserts are manufactured from corrosion resisting steel FE-PA3004 (equivalent to grade X10CrNi18-09), which offers excellent durability and resistance against environmental factors. The steel undergoes air melting and cold drawing without heat treatment to maintain optimal mechanical properties.

• Self-Locking and Helical Coil Design
  The standard defines use of a tanged insertion drive with a helical coil design that results in secure, self-locking screw thread inserts. This feature enhances vibration resistance and prevents loosening during aerospace operations.

• Marking and Identification
  Inserts must be colour-coded blue for material identification, with strict prohibition of chlorine-based constituents in the colourants. Marking follows the EN 2424 aerospace series standard, enabling traceability across supply chains.

• Quality and Production Requirements
  Manufacturers must implement aerospace-approved quality management systems such as EN 9100 or equivalent. Qualification and testing procedures adhere to aerospace standards like EN 9133 to guarantee product consistency and performance stability.

• Operational Temperature Range
  The inserts have been verified for performance up to a maximum test temperature of 350 °C, making them suitable for high-temperature aerospace environments.

Applications

• Aerospace Industry
  kSIST FprEN 2944:2022 inserts are tailored for aerospace applications where reliability and resistance to corrosion and temperature extremes are critical. They are used in aircraft structural assemblies, engine components, and aerospace hardware requiring secure threaded fastenings.

• Aviation and Space Equipment
  The self-locking, corrosion-resistant inserts ensure the longevity and safety of components in spacecraft and aviation platforms subject to vibration, thermal cycling, and corrosive atmospheres.

• Precision Mechanical Assemblies
  The helical coil thread inserts allow for repeated assembly and disassembly, reducing wear on base materials and improving maintenance processes in aerospace manufacturing and repair.

Related Standards

• EN 2943: Aerospace series - Inserts, MJ and M screw threads, helical coil - Technical specification
• EN 2947: Aerospace series - Steel FE-PA3004 (X10CrNi18-09), air melted, non heat treated, cold drawn wire
• EN 3044: Aerospace series - Installation holes for inserts, screw thread, helical coil, self-locking - Design standard
• ISO 5855-2: Aerospace - MJ threads - Limit dimensions for bolts and nuts
• EN 2424: Aerospace series - Marking of aerospace products
• EN 9100: Quality management systems requirements for aviation, space, and defence organizations
• EN 9133: Aerospace series - Quality management systems - Qualification procedure for aerospace standard products

This comprehensive framework facilitates the production and use of high-performance self-locking helical coil inserts, ensuring safety, interchangeability, and standardization across the aerospace manufacturing supply chain. Compliance with kSIST FprEN 2944:2022 supports aerospace organizations in meeting rigorous operational demands and regulatory obligations.