EN 3915:2008

Aerospace series - Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components - Classification: 1 275 MPa (at ambient temperature) / 550 °C - Technical specification

This standard specifies the characteristics, qualification and acceptance requirements for self-locking thin wall salvage inserts with MJ threads in NI-PH2601 (NI P100HT).
Classification: 1 275 MPa  ) / 550 °C  ).

Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung NI-PH2601 (NI-P100HT, Inconel 718), zur Nacharbeit von Bauteilen - Klasse: 1 275 MPa (bei Raumtemperatur) / 550 °C - Technische Lieferbedingungen

Diese Norm legt die Eigenschaften sowie die Qualifikations- und Abnahmeanforderungen an dünnwandige, selbstsichernde Gewindeeinsätze aus NI PH2601 (NI P100HT), mit MJ Gewinde zur Nacharbeit fest.
Klasse: 1 275 MPa  ) / 550 °C  ).

Série aérospatiale - Douilles filetées, à paroi mince, à freinage interne, filetage MJ, en alliage résistant à chaud à base de nickel NI-PH2601 (NI-P100HT, Inconel 718), pour récupération - Classification : 1 275 MPa (à température ambiante) / 550 °C - Spécification technique

Aeronavtika - Vložki, tanka stena, samozapiralni, navoj MJ, iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (NI-P100HT, Inconel 718), za popravljanje sestavnih delov - Klasifikacija: 1 275 MPa (pri temperaturi okolice) / 550 °C - Tehnična specifikacija

General Information

• Status: Published
• Publication Date: 15-Apr-2008
• Withdrawal Date: 30-Oct-2008
• ICS: 49.030.99 - Other fasteners
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2024
• Completion Date: 14-May-2025
• Ref Project: SIST EN 3915:2008 - Aerospace series - Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components - Classification: 1 275 MPa (at ambient temperature) / 550 °C - Technical specification

Overview

EN 3915:2008 is a CEN aerospace technical specification for self‑locking thin wall salvage inserts with MJ threads manufactured from the heat‑resisting nickel‑base alloy NI‑PH2601 (also referenced as NI‑P100HT / Inconel 718). The standard defines the characteristics, qualification and acceptance requirements for inserts used to salvage or repair damaged threaded holes in aerospace structures. Classification is 1 275 MPa (ambient) with a maximum test temperature of 550 °C.

Key topics

• Scope and purpose: Requirements for salvage inserts (thin wall, self‑locking, MJ threads) intended for aerospace repair and overhaul.
• Material and heat treatment: Inserts made from NI‑PH2601 / NI‑P100HT (Inconel 718). Solution and precipitation heat‑treatment schedules are specified (solution treated ~930–1 010 °C; precipitation at 720 ±5 °C with controlled cooling and hold periods or equivalent total ageing time).
• Manufacture and inspection: Allowed manufacturing methods (machining or forming), requirements for surface condition, coatings and gauging. Threads in the locking region may be deformed provided functional gauging passes (GO plug gauge engagement minimum three quarters of a turn).
• Mechanical and performance tests: Tensile property sampling, rotational resistance and insertion tests (for example, maximum insertion torque specified as 0.5 Nm; rotational resistance and reusability testing in accordance with EN 3298).
• Quality assurance: Qualification and acceptance programs, sampling plans, inspection lot definitions, responsibilities, and requirement for inspection/test reports. Qualification is aligned with EN 9133 procedures.
• Non‑destructive and statistical methods: References to penetrant inspection, surface texture (ISO 4288) and sampling schemes (ISO 2859‑1).

Practical applications

• Salvage and repair of damaged or out‑of‑position threaded holes in aircraft structures and engine components.
• Specification for suppliers producing aerospace repair inserts to ensure compatibility, traceability and performance at elevated temperatures.
• Use by:
  • MRO organizations and line maintenance teams specifying approved inserts for field repairs.
  • OEMs and design engineers specifying repair solutions in maintenance manuals.
  • Quality, procurement and compliance teams verifying supplier qualification, acceptance testing and certification.
  • NDT and assembly personnel performing inspection, installation and functional torque testing.

Related standards

Relevant references cited in EN 3915 include:

• EN 3298 (installation and removal procedure)
• EN 3676 (inserts design)
• EN 9133 (qualification for aerospace standard parts)
• EN 4376 / EN 4377 (NI‑PH2601 material forms)
• ISO 4288, ISO 5855‑2, ISO 8642, ISO 3452, ISO 2859‑1 and ASTM E112 (supporting test and inspection methods)

Keywords: EN 3915, aerospace inserts, salvage inserts, self‑locking thin wall inserts, MJ threads, Inconel 718, NI‑PH2601, heat resisting nickel base alloy, qualification, acceptance testing, aircraft repair.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components - Classification: 1 275 MPa (at ambient temperature) / 550 °C - Technical specificationSORWQRRGSRUQHSérie aérospatiale - Douilles filetées, à paroi mince, à freinage interne, filetage MJ, en alliage résistant à chaud à base de nickel NI-PH2601 (NI-P100HT, Inconel 718), pour récupération - Classification : 1 275 MPa (à température ambiante) / 550 °C - Spécification techniqueLuft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung NI-PH2601 (NI-P100HT, Inconel 718), zur Nacharbeit von Bauteilen - Klasse: 1 275 MPa (bei Raumtemperatur) / 550 °C - Technische Lieferbedingungen49.030.99Drugi vezni elementiOther fastenersICS:SIST EN 3915:2008enTa slovenski standard je istoveten z:EN 3915:200801-julij-2008SIST EN 3915:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3915
April 2008 ICS 49.030.99 English Version
Aerospace series - Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components - Classification: 1 275 MPa (at ambient temperature) / 550 °C - Technical specification
Série aérospatiale - Douilles filetées, à paroi mince, à freinage interne, filetage MJ, en alliage résistant à chaud à base de nickel NI-PH2601 (NI-P100HT, Inconel 718), pour récupération - Classification : 1 275 MPa (à température ambiante) / 550 °C - Spécification technique
Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung NI-PH2601 (NI-P100HT, Inconel 718), zur Nacharbeit von Bauteilen - Klasse: 1 275 MPa (bei Raumtemperatur) / 550 °C - Technische LieferbedingungenThis European Standard was approved by CEN on 29 February 2008.
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: rue de Stassart, 36
B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3915:2008: E

1) The strength class of the insert is equal to the minimum tensile stress which the insert is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of higher strength class. 2) Maximum test temperature of the parts. 3) Inactive for new designation, see EN 4376 and EN 4377. 4) Published as ASD Standard at the date of publication of this standard. 5) Published as ASD Prestandard at the date of publication of this standard.

6) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive,. PO Box C700, West Conshohocken, PA 19428-2959 USA. 7) Published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA.
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