SIST EN 4120:2005
(Main)Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at ambient temperature) / 730 °C
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at ambient temperature) / 730 °C
This standard specifies the characteristics of self-locking bihexagonal nuts in NI-P1 01 HT, silver plated on thread, for aerospace applications.
Classification: 1 210 MPa / 730 °C
Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, aus hochwarmfester Nickelbasislegierung NI-PH1302 (Waspaloy), Gewinde versilbert - Klasse: 1 210 MPa (bei Raumtemperatur) / 730 °C
Diese Norm legt die Eigenschaften von selbstsichernden Zwölfkantmuttern aus NI-PH1302, Gewinde versilbert, für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 210 MPa ) / 730 °C )
Série aérospatiale - Écrous bihexagonaux, a freinage interne, en alliage résistant a chaud a base de nickel NI-PH1302 (Waspaloy), argentés sur filetage - Classification : 1 210 MPa (a température ambiante ) / 730 °C
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at ambient temperature) / 730 °C
General Information
- Status
- Published
- Publication Date
- 31-May-2005
- Technical Committee
- SS SPL - Technical Board for the general field
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jun-2005
- Due Date
- 01-Jun-2005
- Completion Date
- 01-Jun-2005
Relations
- Effective Date
- 01-Jun-2005
- Effective Date
- 28-Jan-2026
- Refers
SIST EN 14035-19:2003 - Fireworks - Part 19: Hand-held sparklers - Specification and test methods - Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
SIST EN 4120:2005 defines the characteristics and requirements for self-locking bihexagonal nuts made from heat-resistant nickel base alloy NI-PH1302 (Waspaloy), with silver plated threads. This European standard is crucial within the aerospace industry where fastener performance under high temperature and stress conditions is essential. The specified nuts are classified for use at tensile stresses up to 1,210 MPa at ambient temperature and temperatures up to 730 °C.
Key Topics
- Bihexagonal, Self-Locking Design: This nut configuration provides enhanced grip and anti-loosening features, important for vibration-prone aerospace assemblies.
- Material: Fabricated from heat-resistant nickel alloy NI-PH1302 (Waspaloy), renowned for exceptional strength and oxidation resistance at high temperatures.
- Surface Treatment: Threads are silver plated to meet aerospace requirements, ensuring longevity and corrosion resistance by following EN 2786.
- Standardized Dimensions & Tolerances: Sizes and tolerances are strictly defined, conforming to international standards like ISO 4095 (bihexagonal drives) and ISO 5855-2 (MJ threads).
- Marking & Traceability: Products must be marked in accordance with EN 2424, facilitating identification and traceability within aerospace supply chains.
- Classification: The nuts are rated for 1,210 MPa tensile strength at ambient temperature and functional allowance up to 730 °C, supporting demanding aerospace applications.
Applications
The nuts specified in SIST EN 4120:2005 are primarily intended for aerospace use where extreme reliability, high strength, and resistance to high-temperature environments are non-negotiable. Typical applications include:
- Aircraft Engine Assemblies: Fastening components subjected to thermal cycling and mechanical stress.
- Airframe Structures: Key structural connections requiring vibration resistance and secure locking.
- Spacecraft Assemblies: High specification fasteners for satellite and launcher components exposed to harsh conditions.
- Turbomachinery: Suitable for maintaining joint integrity in turbines and exhaust assemblies operating at elevated temperatures.
These nuts are favored in situations where regular fastener materials and designs would be prone to loosening, thermal creep, or corrosion.
Related Standards
Compliance with SIST EN 4120:2005 may require reference to several related international standards in aerospace fastener technology. Key related standards include:
- ISO 4095: Sets the requirements for bihexagonal drive configurations.
- ISO 5855-2: Specifies limit dimensions for MJ threads in bolts and nuts.
- EN 2424: Details marking requirements for aerospace products.
- EN 2786: Covers electrolytic silver plating methods for fasteners, including thickness requirements.
- EN 2959: Specifies the properties for heat-resisting alloy NI-PH1302 bars used in fasteners.
- EN 3005: Provides the technical specification for self-locking nuts in nickel base alloys.
- EN 3220: Defines standards for cold worked and softened nickel base alloys for continuous forging or extrusion.
Practical Value
Adopting SIST EN 4120:2005 supports robust quality assurance in aerospace engineering, ensuring that critical fasteners meet rigorous international standards for safety, durability, and traceability. Using compliant self-locking bihexagonal nuts mitigates the risk of component failure due to temperature extremes, vibration, or fatigue, thus safeguarding the integrity of aerospace vehicles and installations.
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Frequently Asked Questions
SIST EN 4120:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at ambient temperature) / 730 °C". This standard covers: This standard specifies the characteristics of self-locking bihexagonal nuts in NI-P1 01 HT, silver plated on thread, for aerospace applications. Classification: 1 210 MPa / 730 °C
This standard specifies the characteristics of self-locking bihexagonal nuts in NI-P1 01 HT, silver plated on thread, for aerospace applications. Classification: 1 210 MPa / 730 °C
SIST EN 4120:2005 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.
SIST EN 4120:2005 has the following relationships with other standards: It is inter standard links to SIST EN 4120:2004, SIST EN 3005:2005, SIST EN 14035-19:2003, SIST EN 840-6:2004+A1:2008, SIST EN 2786:2008, SIST EN 2424:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 4120:2005 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)
SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 4120:2004
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base
alloy NI-PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at
ambient temperature) / 730 °C
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-
PH1302 (Waspaloy), silver plated on thread - Classification: 1 210 MPa (at ambient
temperature) / 730 °C
Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, aus hochwarmfester
Nickelbasislegierung NI-PH1302 (Waspaloy), Gewinde versilbert - Klasse: 1 210 MPa
(bei Raumtemperatur) / 730 °C
Série aérospatiale - Écrous bihexagonaux, a freinage interne, en alliage résistant a
chaud a base de nickel NI-PH1302 (Waspaloy), argentés sur filetage - Classification : 1
210 MPa (a température ambiante ) / 730 °C
Ta slovenski standard je istoveten z: EN 4120:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 4120
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 4120:2003
English version
Aerospace series - Nuts, bihexagonal, self-locking, in heat
resisting nickel base alloy NI-PH1302 (Waspaloy), silver plated
on thread - Classification: 1 210 MPa (at ambient temperature) /
730° C
Série aérospatiale - Écrous bihexagonaux, à freinage Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd,
interne, en alliage résistant à chaud à base de nickel NI- aus hochwarmfester Nickelbasislegierung NI-PH1302
PH1302 (Waspaloy), argentés sur filetage - Classification : (Waspaloy), Gewinde versilbert - Klasse: 1 210 MPa (bei
1 210 MPa (à température ambiante ) / 730° C Raumtemperatur) / 730° C
This European Standard was approved by CEN on 11 September 2003.
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Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
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© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4120:2004: E
worldwide for CEN national Members.
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Designation .6
5 Marking .6
6 Technical specification .6
Foreword
This document (EN 4120:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-STAN).
After enquiries and votes carried out in acco
...