SIST EN 3916:2008

Aerospace series - Insert, thin wall - Salvage procedure for components

1.1   This specification covers the accepted methods for the reclamation of installation holes for standard thin wall inserts, within assemblies.
1.2   To enable rectification when defects or damage occur to the standard insert tapped installation hole, or to rectify any out of position of the hole within the specified parameters of use.
1.3   To control the machining of the existing insert hole and the installation requirements of the replacement oversize thin wall insert.

Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig - Verfahren für Nacharbeit von Bauteilen

1.1   Diese Norm enthält die anerkannten Verfahren für die Instandsetzung von Einbaulöchern für genormte dünnwandige Gewindeeinsätze in Baueinheiten,
1.2   um Fehler oder Beschädigungen, die am Standard-Gewindeeinbauloch für Gewinde¬einsätze auftreten, oder Löcher mit Positionstoleranzen im Rahmen der vorgegebenen Anwendungs¬parameter auszubessern;
1.3   um das Bohren des vorhandenen Gewindeeinsatzlochs und die Einbauanforderungen für den dünn¬wandigen Austausch-Gewindeeinsatz mit Übermaß zu steuern.

Série aérospatiale - Douilles filetées, à paroi mince - Procédure pour récupération

Aeronavtika - Vložki, tanka stena - Postopek za popravljanje sestavnih delov

General Information

• Status: Published
• Publication Date: 09-Sep-2008
• ICS: 49.030.99 - Other fasteners
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Aug-2008
• Due Date: 31-Oct-2008
• Completion Date: 10-Sep-2008
• Ref Project: EN 3916:2008 - Aerospace series - Insert, thin wall - Salvage procedure for components

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 3916:2008
01-november-2008
Aeronavtika - Vložki, tanka stena - Postopek za popravljanje sestavnih delov
Aerospace series - Insert, thin wall - Salvage procedure for components
Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig - Verfahren für Nacharbeit von
Bauteilen
Série aérospatiale - Douilles filetées, à paroi mince - Procédure pour récupération
Ta slovenski standard je istoveten z: EN 3916:2008
ICS:
49.030.99 Drugi vezni elementi Other fasteners
SIST EN 3916:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 3916:2008

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SIST EN 3916:2008
EUROPEAN STANDARD
EN 3916
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 49.030.99

English Version
Aerospace series - Insert, thin wall - Salvage procedure for
components
Série aérospatiale - Douilles filetées, à paroi mince - Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig -
Procédure pour récupération Verfahren für Nacharbeit von Bauteilen
This European Standard was approved by CEN on 3 April 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 Ref. No. EN 3916:2008: E
worldwide for CEN national Members.

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SIST EN 3916:2008
EN 3916:2008 (E)
Contents Page
Foreword.3
1 Scope.4
2 Normative references.4
3 Conditions of use.4
4 Re-machining of an existing insert hole .5
5 Insert and tapped hole particulars.6
6 Installation of oversize inserts .9
7 Minimum criteria for the installation and removal tools and their methods of application.9
8 Assembly drive tool and swage tool.10
9 Assembly procedure.11
9.1 Insertion.11
9.2 Swaging.12
9.3 Gauging and inspection.13
10 Oversize insert removal, replacement and tools.14

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SIST EN 3916:2008
EN 3916:2008 (E)
Foreword
This document (EN 3916:2008) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2009, and conflicting national standards shall be withdrawn
at the latest by February 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
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SIST EN 3916:2008
EN 3916:2008 (E)
1 Scope
1.1 This specification covers the accepted methods for the reclamation of installation holes for standard thin
wall inserts, within assemblies.
1.2 To enable rectification when defects or damage occur to the standard insert tapped installation hole, or
to rectify any out of position of the hole within the specified parameters of use.
1.3 To control the machining of the existing insert hole and the installation requirements of the replacement
oversize thin wall insert.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 3676:1998, Aerospace series — Inserts, thin wall, self-locking — Design standard
EN 3913, Aerospace series — Insert, thin wall, self-locking, short, in heat resisting nickel base alloy
NI-PH2601 (NI-P100HT, Inconel 718), silver plated on internal thread, for salvage of components
EN 3914, Aerospace series — Insert, thin wall, self-locking, long, in heat resisting nickel base alloy
NI-PH2601 (NI-P100HT, Inconel 718), silver plated on internal thread, for salvage of components
EN 3915, 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
ISO 965-1, ISO general-purpose metric screw threads — Tolerances — Part 1: Principles and basic data
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
3 Conditions of use
3.1 After reclamation, assemblies shall conform to the dimensional requirements of their respective
Engineering Drawings.
3.2 Table 1 shows the values for the maximum out of position as applied to the theoretical centreline of the
original hole. In practice this is a cylinder of diameter x,xx applied down the theoretical centreline of the original
hole. If the actual position of the hole centreline falls outside the perimeter of this cylinder, the hole cannot be
reclaimed.
3.3 Salvage using oversize inserts is only possible if the 'Boss thickness for component salvage' has been
used in the original design (see EN 3676:1998, Table 6).
3.4 The reclamation facility shall at this stage investigate the component Engineering Drawings to check
that the operations detailed and controlled by sections 4 and 5 will not cause a further non conformance of the
component.
Table 2 demonstrates that 2 types of oversize insert can be used i.e. long or short. Before commencing
reclamation, the original Engineering Drawings shall be checked to establish which type of standard insert has
been used i.e. long or short. The replacement oversize insert and accompanying dimensions from this
specification shall correspond with it, i.e. short for short, long for long.
4

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SIST EN 3916:2008
EN 3916:2008 (E)
Only one reclamation is possible using the oversize insert method for any one hole. Further non conformance
occurring to the oversize insert hole cannot be rectified using this method.
3.5 Performance: It should be noted that the salvage inserts conforming with EN 3915 give 10 reuses
at 550 °C.
Table 1
Dimensions in millimetres
Standard insert internal Maximum out of position of the original hole
thread size (regardless of feature size)
MJ5×0,8-4H6H ∅ 0,5
MJ6×1-4H5H ∅ 0,5
MJ7×1-4H5H ∅ 0,5
MJ8×1-4H5H ∅ 0,5
MJ10×1,25-4H5H ∅ 0,5

4 Re-machining of an existing insert hole
4.1 The existing threaded portion of the insert hole shall be completely removed by using a correctly
aligned cutter (see Figure 1).
4.2 The cutter used shall enable the modified minor diameter B listed within Table 3 to be produced.
4.3 The old counterbore and serrations will be removed when the new counterbore is machined.
4.4 In the case of the original insert hole being out of position, the manufacture shall ensure that the new
oversize insert hole is machined in its correct position, see 3.2 and Table 1.
EXAMPLE

Figure 1
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SIST EN 3916:2008
EN 3916:2008 (E)
5 Insert and tapped hole particulars
5.1 Table 2 provides details of the oversize insert part numbers in relation to the bolt thread diameter and
insert lengths.
Table 2
Dimensions in millimetres
Bolt thread diameter Short insert Length Long insert Length
± 0,3 ± 0,3
EN 3913-050 8,2 EN 3914-050 13,75
MJ5×0,8-4h6h
EN 3913-060 9,5 EN 3914-060 15,95
MJ6×1,0-4h6h
EN 3913-070 11,5 EN 3914-070 18,35
MJ7×1,0-4h6h
EN 3913-080 13,4 EN 3914-080 20,75
MJ8×1,0-4h6h
EN 3913-100 16,8 EN 3914-100 25,45
MJ10×1,25-4h6h

5.2 Table 3 and Figure 2 provide the necessary information for tapped holes to receive oversize thin wall
inserts.
The counterbore depth D applies when oversize inserts are to be installed into light alloy components and
1
prebroaching is not required. Counterbore depth D (refer to Figure 3 and Table 4) applies when oversize
2
inserts are to be installed into hard materials, i.e. steels, nickel and titanium alloys, and the counterbore will
need to be prebroached.
Table 3
Dimensions in millimetres
b c
A ∅B  C D D ∅M G H
1 2
Hole Associated
Length
diameter bolt
Thread Minor  Chamfer
a
code
code thread
max. min. max. min. ± 0,13 ± 0,13 max. min.
...