EN 2928:1996

Aerospace series - Bolts, double hexagon head, relieved shank, long thread, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated - Classification: 1 275 MPa (at ambient temperature)/650 °C

This standard specifies the characteristics of double  hexagon headed bolts with relieved shank and long thread, in NI-P100HT, silver plated, for aerospace applications. Classification: 1 275 MP a / 650 °C

Luft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus hochwarmfester Nickelbasislegierung NI-P100HT (Inconel 718), versilbert - Klasse: 1275 MPa (bei Raumtemperatur)/650°C

Diese Norm legt die Eigenschaften von Zwölfkantschrauben mit Dünnschaft und langem Gewinde, aus NI-P100HT, versilbert, zur Verwendung in der Luft- und Raumfahrt fest. Klasse: 1 275 MPa / 650 °C

Série aérospatiale - Vis à tête bihexagonale, fût dégagé, filetage long, en alliage résistant à chaud à base de nickel NI-P100HT (Inconel 718), argentées - Classification: 1275 MPa (à température ambiante)/650°C

La présente norme spécifie les caractéristiques des vis à tête bihexagonale à fût dégagé et à filetage long, en NI-P100HT, argentées, pour les applications aérospatiales. Classification: 1 275 MPa / 650 °C

Aerospace series - Bolts, double hexagon head, relieved shank, long thread, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated - Classification: 1 275 MPa (at ambient temperature)/650 °C

General Information

• Status: Published
• Publication Date: 19-Mar-1996
• Withdrawal Date: 29-Sep-1996
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 31-May-2017
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 2928:2001 - Aerospace series - Bolts, double hexagon head, relieved shank, long thread, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated - Classification: 1 275 MPa (at ambient temperature)/650 °C

Overview

EN 2928:1996 is a critical standard developed by CEN for the aerospace industry, specifying the characteristics of bolts featuring a double hexagon head, relieved shank, and long thread. These bolts are manufactured in a heat-resisting nickel-base alloy, NI-P100HT (also known as Inconel 718), and are silver-plated to enhance corrosion resistance. The standard is designed to ensure consistent quality and reliability for aerospace applications where high strength and temperature resistance are paramount. Key classification figures include a strength rating of 1 275 MPa at ambient temperature and suitability for use at temperatures up to 650°C.

Key Topics

• Material and Coating: Defines the use of NI-P100HT/Inconel 718 alloy for excellent mechanical performance at elevated temperatures, with a silver-plated finish for improved durability and corrosion protection.
• Design Features: Specifies bolts with a double hexagon head, providing enhanced torque application and easier installation in aerospace assemblies.
• Relieved Shank and Long Thread: Details on the unique relieved shank and extended threaded portion, contributing to increased fatigue resistance and improved load distribution.
• Temperature and Strength Classification: Suitable for operating conditions up to 650°C, with a strength rating of 1 275 MPa at room temperature, aligning with demanding aerospace performance requirements.
• Interchangeability: Facilitates compatibility and interchangeability across manufacturers and aerospace component suppliers by standardizing dimensional and performance criteria.

Applications

EN 2928:1996 bolts are engineered specifically for aerospace sector needs, where high performance and safety are non-negotiable. Typical applications include:

• Aircraft Structures: Used in primary and secondary structures, including wings and fuselage sections, where high strength-to-weight ratio and resistance to heat and corrosion are vital.
• Engine Assemblies: Well-suited for areas exposed to elevated temperatures such as turbine engines and exhaust assemblies due to the heat-resistant properties of Inconel 718.
• Spacecraft and Satellites: Ideal for environments requiring both mechanical integrity and long-term durability under extreme temperature fluctuations.
• Defense and Military Aviation: Employed in military aircraft and high-performance aviation systems where reliability and standardization are essential.
• Maintenance and Repairs: Specified for replacement and repair operations to ensure component compatibility and compliance with aerospace quality standards.

Related Standards

To support comprehensive quality and compatibility in aerospace fastening systems, the following standards are commonly used alongside EN 2928:1996:

• EN 2874 - Aerospace series bolts, specifications for related fastener types.
• EN 2927 - Components and specifications for aerospace nut pairs compatible with double hexagon head bolts.
• EN 4072 - Requirements for bolts and screws in various nickel-based and heat-resistant alloys for aerospace.
• ISO 898-1 - General mechanical properties of fasteners made of various materials, providing overarching guidelines relevant to aerospace applications.
• AS9100 - Quality management systems for aerospace manufacturing and maintenance, ensuring production consistency.

Summary

By adhering to EN 2928:1996, manufacturers, suppliers, and maintenance organizations in the aerospace sector ensure the reliability, safety, and interoperability of high-performance bolts in critical applications. The standard's focus on material quality, mechanical properties, and consistent dimensions supports seamless integration in demanding aerospace environments.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Bolts, double hexagon head, relieved shank, long thread, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated - Classification: 1 275 MPa (at ambient temperature)/650 °CLuft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus hochwarmfester Nickelbasislegierung NI-P100HT (Inconel 718), versilbert - Klasse: 1275 MPa (bei Raumtemperatur)/650°CSérie aérospatiale - Vis a tete bihexagonale, fut dégagé, filetage long, en alliage résistant a chaud a base de nickel NI-P100HT (I
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