SIST EN 4621:2010
(Main)Aerospace series - Inserts, MJ threads, self-locking, self-broaching keys - Technical specification
Aerospace series - Inserts, MJ threads, self-locking, self-broaching keys - Technical specification
This standard specifies the characteristics, qualification and acceptance requirements for self-locking inserts, self-broaching keys with MJ threads, for aerospace applications. It is applicable whenever referenced.
Luft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsicherndmit selbsträumenden Stiften - Technische Lieferbedingungen
Diese Norm legt die Eigenschaften sowie die Qualifikations- und Abnahmeanforderungen an selbstsichernde
Gewindeeinsätze mit MJ-Gewinde mit selbsträumenden Stiften zur Verwendung in der Luft- und Raumfahrt
fest.
Sie ist anzuwenden, wenn auf sie verwiesen wird.
Série aérospatiale - Douilles filetées, à filetages MJ, à freinage interne à clavettes autobrochantes - Spécification technique
Aeronavtika - Vložki, navoj MJ, samozapiralni, samozagozdni ključ - Tehnična specifikacija
Ta standard določa lastnosti, kvalifikacije in zahteve za odobritev za zamozapiralne vložke, samozagozdne ključe z navoji MJ, za uporabo v aeronavtiki. Velja, kadar je naveden.
General Information
Standards Content (Sample)
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
SIST EN 4621:2010
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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
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
EN 4621:2010 (E) 2 Contents Page Foreword . 31Scope . 42Normative references . 43Terms and definitions . 44Quality assurance . 74.1Qualification . 74.2Acceptance . 74.2.1Purpose . 74.2.2Conditions . 74.2.3Responsibility . 74.2.4Inspection and test report . 75Requirements . 7Annex A (normative)
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
EN 4621:2010 (E) 3 Foreword This document (EN 4621:2010) 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 September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. 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, 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 the United Kingdom. SIST EN 4621:2010
EN 4621:2010 (E) 4 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking inserts, self-broaching keys with MJ threads, for aerospace applications. It is applicable whenever referenced. 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 2638, Aerospace series — Aluminium alloy 2024-T3 — Extruded bar and section — 1,2 mm ≤ (a or D) ≤ 150 mm
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
EN 4621:2010 (E) 5 3.2 Surface discontinuities 3.2.1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.2.2 seam open surface defect 3.2.3 lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface 3.2.4 inclusions metallic or non-metallic particles originating from the manufacturing process
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
EN 4621:2010 (E) 6 3.2.11 limiting quality
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
EN 4621:2010 (E) 7 4 Quality assurance 4.1 Qualification EN 9133. Qualification inspections and tests (requirements, methods, numbers of inserts with self-broaching keys) are specified in Table 1. They shall be carried out on: each type and diameter of inserts; 39 inserts selected from a single batch by simple random sampling. The test programme may possibly be reduced, or the qualification be granted without inspection or testing. Any such decision shall be based on the results obtained on similar types and diameters of inserts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of insert samples for the inspections and tests. 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the inserts constituting the batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of inserts) are specified in Table 1. They shall be carried out on each batch inserts from the batch to be tested shall be selected by simple random sampling. Each insert may be submitted to several inspections or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspections and tests. In this case, the number of inserts submitted to these inspections and tests is the same as that submitted for qualification inspection and tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.4 Inspection and test report A test report showing actual numerical values shall be provided if specified in the purchase order. 5 Requirements See Table 1. SIST EN 4621:2010
EN 4621:2010 (E) 8 Table 1 — Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.1
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
EN 4621:2010 (E) 9 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.4
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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