SIST EN 2542:2009

Aerospace series - Steel FE-PL1502 (25CrMo4) - Annealed - Bar and wire - De ≤ 40 mm - For prevailing torque nuts

This standard specifies the requirements relating to:
Steel FE-PL1502 (25CrMo4)
Annealed
Bar and wire
De ≤ 40 mm
For prevailing torque nuts
for aerospace applications.

Luft- und Raumfahrt - Stahl FE-PL1502 (25CrMo4) - Geglüht - Stangen und Drähte - De ≤ 40 mm - Für klemmende Sicherungsmuttern

Diese Norm legt die Anforderungen an
Stahl FE-PL1502 (25CrMo4)
Geglüht
Stangen und Drähte
De ≤ 40 mm
für klemmende Sicherungsmuttern
für Anwendungen in der Luft- und Raumfahrt fest.

Série aérospatiale - Acier FE-PL1502 (25CrMo4) - Recuit - Barres et fils - De ≤ 40 mm - Pour écrous à freinage interne par déformation

Aeronavtika - Jeklo FE-PL1502 (25CrMo4) - Žarjeno - Palice in žice - De ≤ 40 mm - Za pritrditvene matice

General Information

• Status: Published
• Publication Date: 06-Jan-2009
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Dec-2008
• Due Date: 08-Feb-2009
• Completion Date: 07-Jan-2009
• Ref Project: EN 2542:2008 - Aerospace series - Steel FE-PL1502 (25CrMo4) - Annealed - Bar and wire - De ≤ 40 mm - For prevailing torque nuts

Relations

• Refers: SIST EN 9133:2018 - Aerospace series - Quality Management Systems - Qualification Procedure for Aerospace Standard Products
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4258:2024 - Aerospace series - Metallic materials - General organization of standardization - Link between types of European Standards and their use
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3653:2010 - Aerospace series - Nuts, anchor, self-locking, floating, self-aligning, one lug, in steel, cadmium plated, MoS2 lubricated - Classification: 900 MPa (at ambient temperature)/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2856:2009 - Aerospace series - Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore - Classification: 1100 MPa/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3712:2009 - Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3753:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, 60° corner, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2862:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4084:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1100 MPA (at ambient temperature)/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2866:2010 - Aerospace series - Nuts, anchor, self-locking, floating, one lug, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1110 MPa (at ambient temperature)/235 °C
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2754:2009 - Aerospace series - Nuts, anchor, self locking, two lug, floating with counterbore - Classification: 1100 MPa/235 °C
• Effective Date: 28-Jan-2026

Overview

SIST EN 2542:2009 is a European Standard issued by CEN, specifying the requirements for steel FE-PL1502 (25CrMo4), in the annealed condition, supplied as bar and wire with diameters up to 40 mm. This material standard is particularly intended for the production of prevailing torque nuts in the aerospace industry, focusing on consistent quality and reliability in high-performance and safety-critical applications. This standard is part of the wider “Aerospace series” of material standards, ensuring harmonized material characteristics and consistent compliance across aerospace manufacturing and supply chains.

Key Topics

• Material Designation: Steel FE-PL1502 (25CrMo4) is a low-alloy chromium-molybdenum steel. Its annealed state ensures optimal machinability, workability, and appropriate mechanical property balance for aerospace applications.
• Product Form and Size: Applies to bars and wires with diameters up to and including 40 mm, specifically tailored for the manufacture of prevailing torque nuts.
• Delivery Condition: Material must be delivered in the annealed state, supporting subsequent fabrication processes including machining and forming.
• Relevant Mechanical Properties: While detailed values are specified in referenced standards, the material’s typical hardness and microstructure following annealing are suitable for aerospace fasteners requiring prevailing torque features.
• Standardized Designation System: EN 2542 incorporates a codified designation method as per EN 2600, simplifying specification and procurement processes.
• Reference Standards: The standard references essential documents, such as EN 2600 for product designation, EN 4258 for material standardization structure, EN 4500-5 for material standard drafting, EN 4700-2 for technical specifications of steel products, and EN 9133 for quality management in aerospace parts.

Applications

Steel FE-PL1502 (25CrMo4) defined by SIST EN 2542:2009 is primarily used in producing prevailing torque nuts for aerospace assemblies. These nuts require superior mechanical properties and sustained performance under vibration and dynamic loading conditions, prevalent in the aerospace sector. Practical applications include:

• Aircraft engine mounts and structural joints, where prevailing torque fasteners prevent loosening under vibration.
• Critical aerospace mechanisms requiring secure and reliable fastening solutions.
• Use in aerospace manufacturing environments where standardized, traceable materials are required for certification and quality assurance.

By adhering to SIST EN 2542:2009, manufacturers and suppliers ensure that material inputs for aerospace fasteners meet internationally recognized quality and performance standards, supporting airworthiness and safety requirements.

Related Standards

• EN 2600: Defines the rules for the designation of metallic semi-finished products, ensuring consistent identification across the aerospace industry.
• EN 4258: Outlines the general organization of standardization for metallic materials in aerospace applications and links between different standards.
• EN 4500-5: Specifies the drafting and presentation of material standards for steels, ensuring clarity and uniformity.
• EN 4700-2: Technical specification for steel and heat-resisting alloy wrought products including bars and sections.
• EN 9133: Sets requirements for qualification procedures and quality management systems for aerospace standard parts.

Following SIST EN 2542:2009 enables organizations to meet the demanding specifications of the aerospace sector, facilitate international trade, and maintain a high standard of product reliability and safety. This makes it a critical standard for engineers, procurement specialists, and quality managers working with aerospace fasteners and related high-performance applications.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 2542:2008SIST EN 2542:2009en01-februar-2009SIST EN 2542:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2542
November 2008 ICS 49.025.10 English Version
Aerospace series - Steel FE-PL1502 (25CrMo4) - Annealed - Bar and wire - De ≤ 40 mm - For prevailing torque nuts
Série aérospatiale - Acier FE-PL1502 (25CrMo4) - Recuit -Barres et fils - De ≤ 40 mm - Pour écrous à freinage interne par déformation
Luft- und Raumfahrt - Stahl FE-PL1502 (25CrMo4) - Geglüht - Stangen und Drähte - De ≤ 40 mm - Für klemmende Sicherungsmuttern This European Standard was approved by CEN on 24 August 2008.
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 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2542:2008: ESIST EN 2542:2009
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