EN 3298:2008
(Main)Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedure
Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedure
This standard specifies the conditions of installation and removal (hole serration profile, tools, swaging procedure) of self-locking thin wall inserts defined by EN standards, for aerospace applications.
Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd - Ein- und Ausbauverfahren
Série aérospatiale - Douilles filetées, à paroi mince, à freinage interne - Procédure d'installation et d'extraction
Aeronavtika - Vložki, tanka stena, samozapiralni - Postopek namestitve in odstranitve
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedureAeronavtika - Vložki, tanka stena, samozapiralni - Postopek namestitve in odstranitveSérie aérospatiale - Douilles filetées, à paroi mince, à freinage interne - Procédure d'installation et d'extractionLuft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd - Ein- und Ausbauverfahren49.030.30MaticeNutsICS:SIST EN 3298:2008enTa slovenski standard je istoveten z:EN 3298:200801-julij-2008SIST EN 3298:2008SLOVENSKI
STANDARDSIST EN 3298:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3298April 2008ICS 49.030.30Supersedes EN 3298:1998
English VersionAerospace series - Inserts, thin wall, self-locking - Installationand removal procedureSérie aérospatiale - Douilles filetées, à paroi mince, àfreinage interne - Procédure d'installation et d'extractionLuft- und Raumfahrt - Gewindeeinsätze, dünnwandig,selbstsichernd - Ein- und AusbauverfahrenThis European Standard was approved by CEN on 5 January 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3298:2008: E
Recommended tooling.14 A.1 Recommended power swaging tool suppliers.14 A.2 Recommended assembly tooling, removal tooling and gauging suppliers.14 A.3 List of recommended tooling.14
AA AD∅ AB AE°1 ∅ AC
Key 1 Corners may vary from a sharp corner to a radius within the profile tolerance Figure 1
For recommended serration profile gauge numbers, see Annex A, Table A.1. 4 Installation of inserts Pre-installation requirements. Prior to installation, check that the tapped hole, counterbore and serrations (if applicable) are free from burrs and foreign particles, grease, oil, etc. This will particularly apply to removal of the burrs produced by the cutting of the serrations. The required insert shall be inspected to ensure that it is clean and free from protective grease, etc. Inserts installed in steel, heat resisting alloy or titanium alloy components may be lightly smeared externally with clean engine oil (i.e. any of the recognised oils used for the engine lubrication system. If in any doubt, consult the Controlling Quality Engineer) to facilitate assembly into the tapped and serrated counterbored hole. Inserts installed in aluminium or magnesium components must be lightly smeared externally with a suitable jointing compound to prevent electrolytic corrosion. A minimum of 10 minutes air drying time shall be allowed before installation of insert. 5 Minimum criteria for the installation and removal tools and their methods of application The tools and their methods of application described in this standard are not mandatory and show only the basic principles to be observed to achieve the satisfactory installation and subsequent swaging or removal of the inserts. The minimum dimensional requirements provided shall be achieved and on no account shall the design of the tools or their methods of application be such that damage may occur to the threads or the locking zone of the insert or the component into which it is being installed. Always ensure the appropriate tool/insert size combinations have been chosen for either the insertion or swaging of the insert to enable correct installation of the insert. See 6.2 and 6.3. During the swaging operation, the component into which the inserts are installed shall be adequately supported to ensure no flexing or distortion at the insert assembly face occurs. This particularly applies to drum shaped components which are prone to flexing.
Figure 2 Table 2 Dimensions in millimetres A B ∅ C D ∅ E Short insert Long insert ± 0,3 ± 0,2 + 0,050 ± 0,15 ± 0,05 EN3236-050 EN3237-050 7,3 2,50 4,435 1,05 6,95 EN3236-060 EN3237-060 8,5 2,70 5,325 1,30 7,95 EN3236-070 EN3237-070 10,5 3,10 6,325 1,55 8,95 EN3236-080 EN3237-080 12,5 3,50 7,175 1,75 9,95 EN3236-100 EN3237-100 16,0 4,20 9,015 2,25 11,95
For recommended drive tools, see Annex A, Table A.2. D A B∅ E ∅ C 0,55 0,50
Key 1 Shape optional 2 Rad. J 3 Nylon stop washer (Replaceable) Figure 3 Table 3 Dimensions in millimetres F ∅ G ∅ H Rad. J Short insert Long insert + 0,1 0 ± 0,015 ± 0,015 ± 0,25 EN3236-050 EN3237-050 2,255 5,975 3,775 0,65 EN3236-060 EN3237-060 2,455 6,995 4,575 0,80 EN3236-070 EN3237-070 2,655 8,005 5,575 1,00 EN3236-080 EN3237-080 3,055 9,025 6,275 1,00 EN3236-100 EN3237-100 3,755 11,085 7,775 1,15
For recommended swage tool numbers, see Annex A, Table A.3 and Table A.4. F ∅ G ∅ H 1 232,5º 1,5º
Key 1 Insert installation depth before swaging
– for manual tools: 0,400,65 mm
– for power tools: 0,500,65 mm
(see Clause 6 for after swage inspection) 2 Serrations in counterbore of hole
Key 1 Serrations in counterbore of hole 2 Serrations on insert 3 Line up serrations between Insert and counterbored hole to provide “best fit” Figure 4 Figure 5
7.2 Insert alignment prior to swaging Before swaging the insert ensure the mating component is well supported, especially in the area the inserts are installed. 2 1 12 3
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