EN 4078:2009
(Main)Aerospace series - Inserts, threaded, thin wall, locked and self-locking, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Aerospace series - Inserts, threaded, thin wall, locked and self-locking, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
This European Standard specifies the characteristics of threaded thin wall inserts, locked and with a self-locking feature achieved by deforming out-of-round the internal thread of mid length, in heat resisting steel, MoS2 lubricated.
Classification : 1 100 MPa / 315 °C.
Luft- und Raumfahrt - Gewindeeinsatz, dünnwandig, gesichert und schraubensichernd, aus hochwarmfestem Stahl, MoS2 geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Diese Norm legt die Eigenschaften von dünnwandigen Gewindeeinsätzen, gesicherten und mit einer durch Verformung des mittleren Innengewindeteils erzielten Selbstsicherung, aus hochwarmfestem Stahl, MoS2 geschmiert, fest.
Klasse: 1 100 MPa/315 °C.
Série aérospatiale - Douilles filetées, à paroi mince, freinées et à freinage interne, en acier résistant à chaud lubrifiées MoS2 - Classification: 1 100 MPa (à température ambiante) / 315 °C
Aeronavtika - Vložki, z navojem, tanka stena, varovani in samozapiralni, iz toplotnoodpornega jekla, mazani z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
Ta evropski standard opredeljuje značilnosti vložkov z navojem za tanko steno, varovanih in s samozapiralno funkcijo, ki je dosežena z rahlo ovalnim deformiranjem notranjega navoja srednje dolžine iz toplotnoodpornega jekla in mazanih z MoS2. Klasifikacija: 1.100 MPa1) / 315°C.
General Information
- Status
- Published
- Publication Date
- 10-Nov-2009
- Withdrawal Date
- 30-May-2010
- 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
- 28-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 4078:2009 is a CEN aerospace standard that specifies the characteristics of threaded thin-wall inserts that are locked and self-locking, manufactured in heat-resisting steel and MoS2 (molybdenum disulphide) lubricated. The standard defines configuration, dimensions, materials, surface treatment, designation, marking and installation requirements for inserts classified 1100 MPa (at ambient temperature) / 315 °C. The classification indicates the minimum tensile stress capacity (when tested with a higher-strength bolt) and the maximum temperature the insert can withstand without permanent alteration (the latter is conditioned by the MoS2 lubricant).
Key topics and technical requirements
- Configuration & dimensions: Detailed sizes, tolerances and mass data are given (see Figure 1 and Table 1 in the standard). Dimensions and tolerances are expressed in millimetres and apply before MoS2 lubrication.
- Self-locking feature: Achieved by deforming the internal thread out-of-round at mid length to provide a locking action.
- Materials: Heat-resisting steels are required; material selection aligns with TR 3791.
- Surface treatment & lubrication: Inserts are MoS2 lubricated; coating methods referenced to EN 2491.
- Threads & tolerances: Internal and external thread specifications refer to ISO 5855-2 (MJ threads) and ISO 965-1 (metric thread tolerances).
- Marking & designation: Marking follows EN 2424 (style G); designation format examples (e.g., EN4078A060) are provided.
- Installation & technical specification: Installation and removal procedures are covered by EN 4217; additional technical specs (e.g., self-locking MJ threads) referenced in EN 4218.
Applications and who uses this standard
- Practical applications:
- Use in aerospace assemblies where high temperature resistance and reliable self-locking are required (airframe and other high-temperature components).
- Component manufacturers specifying threaded inserts for thin-walled assemblies.
- Maintenance, repair and overhaul (MRO) activities requiring replacement or installation of certified inserts.
- Intended users:
- Aerospace design and fastener engineers
- Procurement and quality assurance teams
- Insert manufacturers and coating suppliers
- MRO organizations and technical documentation teams
Related standards
- EN 2424 - Marking of aerospace products
- EN 2491 - MoS2 dry lubricant coating methods
- EN 4217 - Installation/removal for thin-wall inserts
- EN 4218 - Technical specification for self-locking MJ thread inserts
- ISO 965-1, ISO 5855-2 - Thread tolerances and MJ thread dimensions
- TR 3791 - Materials for self-locking nuts and inserts
EN 4078:2009 helps ensure consistent performance and interchangeability of MoS2-lubricated, heat-resistant self-locking thin-wall inserts across European aerospace supply chains. Keywords: EN 4078:2009, aerospace inserts, threaded thin wall inserts, self-locking inserts, heat resisting steel, MoS2 lubricated, 1100 MPa, 315 °C.
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Frequently Asked Questions
EN 4078:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Inserts, threaded, thin wall, locked and self-locking, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C". This standard covers: This European Standard specifies the characteristics of threaded thin wall inserts, locked and with a self-locking feature achieved by deforming out-of-round the internal thread of mid length, in heat resisting steel, MoS2 lubricated. Classification : 1 100 MPa / 315 °C.
This European Standard specifies the characteristics of threaded thin wall inserts, locked and with a self-locking feature achieved by deforming out-of-round the internal thread of mid length, in heat resisting steel, MoS2 lubricated. Classification : 1 100 MPa / 315 °C.
EN 4078:2009 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 4078:2009 has the following relationships with other standards: It is inter standard links to EN 2424:2008, EN 840-6:2004+A1:2008, EN 2491:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4078:2009 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.Aeronavtika - Vložki, z navojem, tanka stena, varovani in samozapiralni, iz toplotnoodpornega jekla, mazani z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °CLuft- und Raumfahrt - Gewindeeinsatz, dünnwandig, gesichert und schraubensichernd, aus hochwarmfestem Stahl, MoS2 geschmiert - Klasse: 1100 MPa (bei Raumtemperatur)/315 °CSérie aérospatiale - Douilles filetées, à paroi mince, freinées et à freinage interne, en acier résistant à chaud lubrifiées MoS2 - Classification: 1100 MPa (à température ambiante)/315 °CAerospace series - Inserts, threaded, thin wall, locked and self-locking, in heat resisting steel, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/315 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4078:2009SIST EN 4078:2010en01-januar-2010SIST EN 4078:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4078
November 2009 ICS 49.030.30 English Version
Aerospace series - Inserts, threaded, thin wall, locked and self-locking, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Série aérospatiale - Douilles filetées, à paroi mince, freinées et à freinage interne, en acier résistant à chaud lubrifiées MoS2 - Classification: 1 100 MPa (à température ambiante) / 315 °C
Luft- und Raumfahrt - Gewindeeinsatz, dünnwandig, gesichert und schraubensichernd, aus hochwarmfestem Stahl, MoS2 geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 315 °C This European Standard was approved by CEN on 15 September 2009.
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:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4078:2009: ESIST EN 4078:2010
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