SIST EN 4621:2010

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VSHFLILNDFLMDLuft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsicherndmit selbsträumenden Stiften - Technische LieferbedingungenSérie aérospatiale - Douilles filetées, à filetages MJ, à freinage interne à clavettes autobrochantes - Spécification techniqueAerospace series - Inserts, MJ threads, self-locking, self-broaching keys - Technical specification49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4621:2010SIST EN 4621:2010en01-maj-2010SIST EN 4621:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4621
March 2010 ICS 49.030.30 English Version
Aerospace series - Inserts, MJ threads, self-locking, self-broaching keys - Technical specification
Série aérospatiale - Douilles filetées, à filetages MJ, à freinage interne à clavettes auto-brochantes - Spécification technique
Luft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsicherndmit selbsträumenden Stiften - Technische Lieferbedingungen This European Standard was approved by CEN on 9 January 2010.
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, Croatia, 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.
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B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4621:2010: ESIST EN 4621:2010

Definition of test block .18Annex B (normative)
Assembly for rotational resistance test .19Annex C (normative)
Axial tensile strength test .21Annex D (normative)
Assembly for reusability test .23Annex E (normative)
"GO" gauge for inspection of the position of the keys .25 SIST EN 4621:2010

With coarse peripheral grain control 1) EN 4619, Aerospace series — Inserts, MJ threads, self-locking, with self-broaching keys — Installation and removal procedure
EN 4620, Aerospace series — Inserts, MJ threads, self-locking, with self-broaching keys — Design standard
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-Iot inspection ISO 3452:1984, Non-destructive testing — Penetrant inspection — General principles ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and procedures for the assessment of surface texture ISO 5855-1, Aerospace — MJ threads — Part 1: General requirements ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts ASTM E 112-96, Standard Test Methods for Determining Average Grain Size 2) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 batch quantity of finished parts, of the same type and same diameter, produced from the same material obtained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments
1) Published as ASD Prestandard at the date of publication of this standard. 2) Published by: American Society for Testing and Materials (ASTM), 1916, Race Street, Philadelphia, PA 19103, USA. SIST EN 4621:2010

NOTE These particles may be isolated or arranged in strings. 3.2.5 test temperature ambient temperature, unless otherwise specified 3.2.6 simple random sampling taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen 3.2.7 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item 3.2.8 major defect defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 3.2.9 minor defect defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product 3.2.10 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision SIST EN 4621:2010

LQ10 in a sampling plan, quality limit which corresponds to a specified 10 % probability of acceptance NOTE 1 It is the limiting lot quality characteristic that the consumer is willing to accept with a low probability that a lot of this quality would occur. NOTE 2 For the purposes of this standard, the limiting quality quoted in Table 4 corresponds to a probability of acceptance of 10 %. 3.2.12 acceptance quality limit
AQL quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance NOTE It is the maximum percent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average. 3.2.13 finished insert insert ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the definition document 3.2.14 definition document document specifying all the requirements for finished inserts 3.2.15 self-locking torque ttorque to be applied to the associated bolt to maintain movement of rotation in relation to the part, the assembly being under no axial load and the insert locking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.2.16 seating torque tightening torque to be applied to the insert or bolt to introduce or to increase the axial load in the assembly 3.2.17 unseating torque untightening torque to be applied to the insert or bolt to reduce or remove the axial load in the assembly 3.2.18 breakaway torque torque required to start unscrewing the insert or the bolt from the associated part, with the insert locking device still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a halt in rotational movement SIST EN 4621:2010

Material In accordance with the definition document Chemical analysis or certificate of conformity issued by the manufacturer of the semi-finished product Q
5.2
Dimensions, tolerances and tolerances of form and position In accordance with the definition document. A "GO" inspection gauge is to be fitted on the insert keys. On completion of this inspection, the keys shall neither be bent nor moved. Standard gauging See Annex E. Q 39
A Tables 3 and 4 5.3
Manufacturing
5.3.1
Process Insert threads may be produced by machining or forming. Manufacturing method shall be indicated on test report.
5.3.2
Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination. Calibration of the heat treatment equipment shall be confirmed.
Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting with an appropriate equipment. Visual examination
The material shall be heat treated in accordance with the material specification defined in the definition document. Examination of the heat treatment specification 5.3.3
Thread deformation (form out-of round) Threads in the locking zone may be deformed in any manner provided that the insert meets the requirements of this standard. The finished inserts shall allow the "GO" thread plug gauge to enter a minimum of three turns, when gauged from the installation side before engagement in the locking zone. Standard gauging Q 39
A Tables 3 and 4 5.3.4
Surface roughness In accordance with the definition document ISO 4288 Q 3
A Tables 3 and 4 5.3.5
Surface coating In accordance with the definition document See applicable coating standard. Q 36
A Tables 3 and 4
A Table 6 (continued) SIST EN 4621:2010

Mechanical properties
5.4.1
Installation requirement The screwing of insert shall be possible freely by hand. After testing, the inserts shall show no signs of:
– buckling and/or incomplete fitting of the keys; – deformation of the internal thread of the insert caused by keys installation. Inserts shall be ins
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