SIST EN 2908:2001

Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °C

This standard specifies the characteristics of self-locking bihexagonal nuts with deep counterbore in FE-PA92HT for aerospace applications.

Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl FE-PA92HT (A286) - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °C

Diese Norm legt die Eigenschaften von selbstsichernden Zwölfkantmuttern mit zylindrischer Aussenkung aus FE-PA92HT zur Verwendung in der Luft- und Raumfahrt fest.

Série aérospatiale - Ecrous bihexagonaux, a freinage interne, chambrés, en acier résistant a chaud FE-PA92HT (A286) - Classification: 1 100 MPa (a température ambiante) / 650 °C

La présente norme spécifie les caractéristiques des écrous bihexagonaux, à freinage interne, chambrés, FE-PA92HT, por les applications aérospatiales.

Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °C

General Information

• Status: Published
• Publication Date: 31-Dec-2000
• ICS: 49.030.30 - Nuts
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2001
• Due Date: 01-Jan-2001
• Completion Date: 01-Jan-2001
• Ref Project: EN 2908:1994 - Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °C

Relations

• Referred By: SIST EN 60027-7:2010 - Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60909-0:2016 - Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60909-3:2010 - Short-circuit currents in three-phase a.c systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2009)
• Effective Date: 09-Feb-2026

Overview

SIST EN 2908:2001 is an international standard developed by the Slovenski inštitut za standardizacijo (SIST) as part of the aerospace standards series. This document specifies the requirements and characteristics for self-locking, bihexagonal nuts with deep counterbore, manufactured from heat resisting steel FE-PA92HT (A286). These nuts are designed for use in aerospace applications where high mechanical properties and temperature resistance are essential. The standard classifies the nuts for service at 1 100 MPa (at ambient temperature) and up to 650 °C, ensuring reliability in demanding environments.

Key Topics

• Nut Type: Bihexagonal (twelve-point), self-locking, deep counterbored design for secure fastening and consistent performance.
• Material: High-temperature, heat resisting steel FE-PA92HT (A286) for durability and resistance to corrosion and oxidation.
• Mechanical Classification: Rated for use at 1 100 MPa tensile strength at ambient temperature and up to 650 °C, supporting performance in extreme conditions.
• Aerospace Relevance: Designed to meet the stringent safety and reliability requirements of aerospace engineering.

Applications

Nuts covered by SIST EN 2908:2001 serve a critical role in:

• Aircraft engine assemblies: Providing secure fastening under high vibration and temperature fluctuations.
• Aerospace structures: Used in components requiring high mechanical integrity and temperature resistance.
• Spacecraft and satellite hardware: Applied where both self-locking capability and high material strength are essential for safety.
• Maintenance and repair operations: Supporting replacement and reliability in mission-critical aerospace systems.

Key benefits of these nuts include:

• Enhanced safety from self-locking feature, which reduces the risk of loosening under vibration.
• High strength-to-weight ratio, suitable for aerospace performance needs.
• Thermal stability at elevated temperatures, maintaining mechanical properties even in extreme environments.

Related Standards

For comprehensive aerospace fastener specification and compatibility, refer to:

• EN 2908:1994 - The European counterpart, providing harmonized requirements for these nuts within Europe.
• EN and ISO series for aerospace fasteners - Covering bolts, screws, nuts, and other fastening components.
• SIST EN 2002 - Materials and testing standards for aeronautical products.
• ISO 898-2 - General requirements for mechanical fasteners, including mechanical and material properties.

Adherence to SIST EN 2908:2001 ensures compliance with industry best practices for aerospace fasteners, delivering critical advantages in safety, reliability, and performance.

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Keywords: SIST EN 2908:2001, aerospace nuts, bihexagonal nut, self-locking nut, FE-PA92HT, A286, deep counterbored nut, high temperature fastener, aerospace fastener standards, mechanical properties, heat resisting steel, aerospace engineering.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °CLuft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl FE-PA92HT (A286) - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °CSérie aérospatiale - Ecrous bihexagonaux, a freinage interne, chambrés, en acie
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