1、BS ISO 8168:2016Aerospace Bolts, with MJthreads, made of heat andcorrosion resisting steel,strength class 1 100 MPa Procurement specificationBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 8168:2016 BRITISH STANDARDNational forewordThis British Standard is the
2、 UK implementation of ISO 8168:2016. Itsupersedes BS ISO 8168:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its s
3、ecretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 91306 8ICS 49.030.20Compliance with a British Standard canno
4、t confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedBS ISO 8168:2016 ISO 2016Aerospace Bolts, with MJ threads, made of heat and corrosion r
5、esisting steel, strength class 1 100 MPa Procurement specificationAronautique et espace Vis filetages MJ, en acier rsistant la chaleur et la corrosion, de classe de rsistance 1 100 MPa Spcification dapprovisionnementINTERNATIONAL STANDARDISO8168Third edition2016-08-15Reference numberISO 8168:2016(E)
6、BS ISO 8168:2016ISO 8168:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, in
7、cluding photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTe
8、l. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 8168:2016ISO 8168:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Quality assurance 34.1 General . 34.2 Qualification inspection conditions 34.3 Acceptance inspection conditions 44.4 Use of “st
9、atistical process control” (SPC) . 45 Requirements 4Annex A (informative) Cross-sectional areas and formulae for tensile loads 18Annex B (informative) Cross-sectional areas and formulae for double shear loads .20Bibliography 21 ISO 2016 All rights reserved iiiContents PageBS ISO 8168:2016ISO 8168:20
10、16(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which
11、 a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all mat
12、ters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This d
13、ocument was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all
14、 such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and
15、does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: ww
16、w.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems.This third edition cancels and replaces the second edition (ISO 8168:2008), which has been technically revised and includes the following c
17、hanges: updated normative references; updated terminology; and editorial modifications.iv ISO 2016 All rights reservedBS ISO 8168:2016INTERNATIONAL STANDARD ISO 8168:2016(E)Aerospace Bolts, with MJ threads, made of heat and corrosion resisting steel, strength class 1 100 MPa Procurement specificatio
18、n1 ScopeThis document specifies the characteristics and quality assurance requirements for MJ thread bolts made of heat and corrosion resisting steel, of strength class 1 100 MPa, for aerospace construction.It is applicable whenever it is referenced in a definition document.2 Normative referencesThe
19、 following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.I
20、SO 2859-1:1999, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspectionISO 3452-1, Non-destructive testing Penetrant testing Part 1: General principlesISO 4288, Geometrical Product Specifications (GPS) Surface text
21、ure: Profile method Rules and procedures for the assessment of surface textureISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nutsISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 7870-1, Control charts Part 1: General guidelinesISO
22、7870-2, Control charts Part 2: Shewhart control chartsISO 7870-3, Control charts Part 3: Acceptance control chartsISO 7961, Aerospace Bolts Test methodsASTM E112:2004, Standard Test Methods for Determining Average Grain Size3 Terms and definitionsFor the purposes of this document, the following term
23、s and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1batchquantity of finished parts, manufactured usi
24、ng the same process, from a single material cast (single heat of alloy), having the same definition document number, diameter, heat-treated together to the same specified condition and produced as one continuous run ISO 2016 All rights reserved 1BS ISO 8168:2016ISO 8168:2016(E)3.2inspection lotquant
25、ity of bolts from a single production batch having the same definition document number3.3definition documentdocument specifying directly or indirectly all the requirements for productsNote 1 to entry: The definition document may be an International Standard, an in-house standard or a drawing.3.4crac
26、krupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character3.5seamlongitudinal open surface defect3.6lapsurface defect caused by folding over metal fins or sharp corners and then forming them into the surface3.7crevicehollow area at t
27、hread crest3.8inclusionsnon-metallic particles originating from the material manufacturing processNote 1 to entry: These particles may be isolated or arranged in strings.3.9sampling planplan according to which one or more samples are taken in order to obtain information and possibly reach a decision
28、Note 1 to entry: In this document, each sampling plan specifies the number of bolts to be inspected as a function of the size of the batch and the acceptance number number of defective items acceptable (Ac).Note 2 to entry: Ac = acceptance number (supplementary information taken from ISO 2859-1).3.1
29、0simple random samplingsampling 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 chosen3.11critical defectdefect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for in
30、dividuals using, maintaining or depending upon the considered product, or that is likely to prevent performance of the function of a major end item3.12major defectdefect other than critical, that is likely to result in failure or to reduce materially the usability of the considered product for its i
31、ntended purpose2 ISO 2016 All rights reservedBS ISO 8168:2016ISO 8168:2016(E)3.13minor defectdefect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from the established specifications having little bearing on the effect
32、ive use or operation of this product3.14limiting qualityLQquality limit which corresponds to a specified and relatively low probability of acceptanceNote 1 to entry: It is the limiting lot quality characteristic that the consumer is willing to accept with a low probability that a lot of this quality
33、 would occur.Note 2 to entry: For the purposes of this document, the limiting quality quoted in Table 4 corresponds to a probability of acceptance of 10 %.3.15acceptable quality levelAQLmaximum percent defective (or the maximum number of defects per hundred units) that, for purposes of sampling insp
34、ection, can be considered satisfactory as a process averageNote 1 to entry: Variant: quality level, which in a sampling plan, corresponds to a specified but relatively high probability of acceptance.4 Quality assurance4.1 GeneralThe manufacturer shall be capable of providing a continuous production
35、of bolts complying with the quality requirements specified in this document. It is recommended that the manufacturer implement a recognized quality management system. The purpose of qualification inspections1)of bolts is to check that the design and manufacturing conditions of a bolt allow it to sat
36、isfy the requirements of this document.Quality documentation for parts produced in accordance with this document shall be maintained for a minimum period of 10 years.The purpose of a production acceptance inspection of a bolt is to check, as simply as possible, using a method which is inexpensive bu
37、t representative of the actual conditions of use, with the uncertainty inherent in statistical sampling, that the bolt satisfies the requirements of this document.Production acceptance inspections shall be carried out by the manufacturer or under his responsibility.4.2 Qualification inspection condi
38、tionsUnless otherwise specified, the inspection shall be carried out on: each type and diameter of bolt; 25 bolts selected from a single inspection lot by simple random sampling.The test programme may possibly be reduced, or the qualification granted, without inspection: any such decision shall be b
39、ased on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical.1) In order to simplify the text, the term “inspections” used in this document also refers to “inspections and tests”. ISO 2016 All rights reserved 3BS ISO 8168:20
40、16ISO 8168:2016(E)The inspections shall be repeated on any bolt if the manufacturing conditions have been modified.Table 2 indicates the allocation of bolt samples for the inspections.4.3 Acceptance inspection conditionsInspections shall be carried out on each production batch or inspection lot. Bol
41、ts from the batch or lot to be inspected shall be selected by simple random sampling.Each bolt may be submitted to several inspections, provided that none of the characteristics to be verified has been previously altered during any of these inspections.The bolts to be subjected to destructive inspec
42、tions may be those on which non-destructive inspections have been carried out.If a more stringent inspection is deemed necessary, all or part of the qualification inspections may be performed during the acceptance inspections. In this case, the number of bolts submitted is the same as that submitted
43、 for the qualification inspection.Production batches or inspection lots declared unacceptable after the production acceptance inspections shall be submitted for re-inspection only after all the defective units have been removed and/or defects have been corrected. In this case, the attribute(s) that
44、caused the rejection shall be verified using a sample of twice the normal size with the same number of defective items acceptable.4.4 Use of “statistical process control” (SPC)When a characteristic is obtained by a controlled statistical process, the manufacturer has the option, in order to declare
45、conformity of the characteristic, to forgo the final systematic sampling provided in this document, if he is capable of formally justifying this choice by using ISO/TR 13425 and the standards quoted in it as a basis.This justification will include the following phases: analysis of the key characteri
46、stics of the product; analysis of the risks for each implemented process; determination of the parameters and/or characteristics to be respected under SPC; determination of the capabilities of each process; drawing up of an inspection plan and integration in the manufacturing process; drawing up of
47、routes and control charts (ISO 7870-3, ISO 7870-1, ISO 7870-2); use of control charts for data consolidation; determination of the audits to be run and the control to be carried out to ensure reliability of the device.To be usable in production, this process shall be validated beforehand by the qual
48、ifying body, either during the qualification phase, or a posteriori according to the case, by analysing the justificatory file and the results of the qualification inspections such as provided for in Clause 5. Such an SPC process is not applicable to destructive tests apart from the stress durabilit
49、y test.5 RequirementsThe requirements of this document are given in Table 1 and, unless otherwise specified, they apply to bolts that are ready for use. The test temperature, unless otherwise specified, shall be the ambient temperature. These requirements complement the requirements of all other standards or specifications referenced in the definition document.4 ISO 2016 All rights reservedBS ISO 8168:2016ISO 8168:2016(E)Table 1 Requirements and test methodsClause Characteristic Requir
