EN 2908:1994
(Main)Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, in heat resisting steel FE-PA92HT (A286) - Classification: 1 100 MPa (at ambient temperature) / 650 °C
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, à freinage interne, chambrés, en acier résistant à chaud FE-PA92HT (A286) - Classification: 1 100 MPa (à 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
- 22-Aug-1994
- Withdrawal Date
- 27-Feb-1995
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2025
- Completion Date
- 11-Feb-2026
Relations
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
Overview
EN 2908:1994 defines the characteristics of bihexagonal, self-locking nuts with a deep counterbore manufactured in heat-resisting steel FE-PA92HT (A286) for aerospace use. The standard identifies mechanical classification as 1 100 MPa (at ambient temperature) / 650 °C, and specifies the form, function and intended application envelope for these high-temperature, high-strength fasteners. This document is intended for engineers, procurement specialists and quality teams working with aerospace fastener selection and certification.
Key Topics
- Product scope: Self-locking bihexagonal nuts with deep counterbore in FE-PA92HT (A286) for aerospace applications.
- Material: Heat-resisting steel FE-PA92HT (A286) - specified to ensure elevated temperature performance and sustained strength.
- Mechanical classification: Noted as 1 100 MPa (at ambient temperature) / 650 °C, indicating the design intent for high-strength and high-temperature service.
- Form and function: Bihexagonal geometry and internal self-locking feature combined with a deep counterbore to suit mating fastener assemblies used in aerospace structures.
- Compliance and use: Targets industry requirements for repeatable performance, resistance to vibration loosening, and compatibility with high-temperature environments.
Applications
These nuts are specified for aerospace applications where elevated temperature resistance and reliable locking performance are required. Typical practical values include:
- Use on high-temperature engine components, exhaust systems and hot-structure assemblies where A286-class materials are selected.
- Situations requiring a deep counterbore for clearance or recessing the nut into a component to control load distribution and geometry.
- Assemblies exposed to vibration and thermal cycling where self-locking behavior reduces the risk of fastener loosening.
Benefits and practical considerations:
- Thermal resilience: Material choice (FE-PA92HT / A286) provides improved performance at raised temperatures compared with standard stainless steels.
- High strength: The classification supports high-load fastening demands typical in aerospace structures.
- Design integration: Deep counterbore and bihexagonal form support secure seating in precision assemblies.
Related Standards
- Standards covering aerospace fasteners, bolt/washer compatibility and assembly processes are typically referenced alongside EN 2908:1994 when specifying a complete fastening solution.
- Material specifications and heat-treatment guidance for A286/FE-PA92HT components are complementary documents to consult for metallurgy and processing.
For procurement and engineering teams, EN 2908:1994 provides a focused baseline for selecting bihexagonal self-locking, deep counterbored nuts where high-temperature, high-strength performance is essential. Ensure compatibility with mating components and refer to applicable material and fastener installation standards when applying this specification.
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Frequently Asked Questions
EN 2908:1994 is a standard published by the European Committee for Standardization (CEN). Its full title is "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 covers: This standard specifies the characteristics of self-locking bihexagonal nuts with deep counterbore in FE-PA92HT for aerospace applications.
This standard specifies the characteristics of self-locking bihexagonal nuts with deep counterbore in FE-PA92HT for aerospace applications.
EN 2908:1994 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 2908:1994 has the following relationships with other standards: It is inter standard links to EN 60909-0:2016, EN 60027-7:2010, EN 60909-3:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 2908:1994 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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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