1、BS ISO 8168:2016 Aerospace Bolts, with MJ threads, made of heat and corrosion resisting steel, strength class 1 100 MPa Procurement specification BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 8168:2016 BRITISH STANDARD National foreword This British Standar
2、d is the UK implementation of ISO 8168:2016. It supersedes BS ISO 8168:2008 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems. A list of organizations represented on this committee can be obtained on req
3、uest to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 91306 8 ICS 49.030.20 Compliance with a Br
4、itish Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2016. Amendments issued since publication Date Text affectedBS ISO 8168:2016 ISO 2016 Aerospace Bolts, with MJ threads, ma
5、de of heat and corrosion resisting steel, strength class 1 100 MPa Procurement specification Aronautique et espace Vis filetages MJ, en acier rsistant la chaleur et la corrosion, de classe de rsistance 1 100 MPa Spcification dapprovisionnement INTERNATIONAL STANDARD ISO 8168 Third edition 2016-08-15
6、 Reference number ISO 8168:2016(E)BS ISO 8168:2016ISO 8168:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any
7、 means, electronic or mechanical, including 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 office Ch. de Blandonnet 8 CP 401
8、 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 8168:2016ISO 8168:2016(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Quality assurance 3 4.1 General . 3 4.2 Qualification inspection conditions 3 4.
9、3 Acceptance inspection conditions 4 4.4 Use of “statistical process control” (SPC) . 4 5 Requirements 4 Annex A (informative) Cross-sectional areas and formulae for tensile loads 18 Annex B (informative) Cross-sectional areas and formulae for double shear loads .20 Bibliography 21 ISO 2016 All righ
10、ts reserved iii Contents PageBS ISO 8168:2016ISO 8168:2016(E) Foreword ISO (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 comm
11、ittees. Each member body interested in a subject for which 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
12、International Electrotechnical Commission (IEC) on all matters 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 th
13、e different types of ISO documents should be noted. This document 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. I
14、SO shall not be held responsible for identifying any or all 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 doc
15、ument is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in t
16、he Technical Barriers to Trade (TBT) see the following URL: www.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),
17、 which has been technically revised and includes the following changes: updated normative references; updated terminology; and editorial modifications.iv ISO 2016 All rights reservedBS ISO 8168:2016INTERNATIONAL ST ANDARD ISO 8168:2016(E) Aerospace Bolts, with MJ threads, made of heat and corrosion
18、resisting steel, strength class 1 100 MPa Procurement specification 1 Scope This 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 wheneve
19、r it is referenced in a definition document. 2 Normative references The 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
20、edition of the referenced document (including any amendments) applies. ISO 2859-1:1999, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3452-1, Non-destructive testing Penetrant testing Part 1: General
21、principles ISO 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test
22、at room temperature ISO 7870-1, Control charts Part 1: General guidelines ISO 7870-2, Control charts Part 2: Shewhart control charts ISO 7870-3, Control charts Part 3: Acceptance control charts ISO 7961, Aerospace Bolts Test methods ASTM E112:2004, Standard Test Methods for Determining Average Grain
23、 Size 3 Terms and definitions For the purposes of this document, the following terms 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:
24、available at http:/ /www.iso.org/obp 3.1 batch quantity of finished parts, manufactured using 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 continuo
25、us run ISO 2016 All rights reserved 1BS ISO 8168:2016ISO 8168:2016(E) 3.2 inspection lot quantity of bolts from a single production batch having the same definition document number 3.3 definition document document specifying directly or indirectly all the requirements for products Note 1 to entry: T
26、he definition document may be an International Standard, an in-house standard or a drawing. 3.4 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.5 seam longitudinal open surface defect 3.6 lap surface defect caused b
27、y folding over metal fins or sharp corners and then forming them into the surface 3.7 crevice hollow area at thread crest 3.8 inclusions non-metallic particles originating from the material manufacturing process Note 1 to entry: These particles may be isolated or arranged in strings. 3.9 sampling pl
28、an plan according to which one or more samples are taken in order to obtain information and possibly reach a decision 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 defecti
29、ve items acceptable (Ac). Note 2 to entry: Ac = acceptance number (supplementary information taken from ISO 2859-1). 3.10 simple random sampling sampling 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 3.11 cri
30、tical 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 3.12 major defect defect ot
31、her than critical, that is likely to result in failure or to reduce materially the usability of the considered product for its intended purpose2 ISO 2016 All rights reservedBS ISO 8168:2016ISO 8168:2016(E) 3.13 minor defect defect that is not likely to reduce materially the usability of the consider
32、ed product for its intended purpose, or that is a departure from the established specifications having little bearing on the effective use or operation of this product 3.14 limiting quality LQquality limit which corresponds to a specified and relatively low probability of acceptance Note 1 to entry:
33、 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 to entry: For the purposes of this document, the limiting quality quoted in Table 4 corresponds to a probability of acceptance of 10 %. 3.15 acc
34、eptable quality level AQL 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 Note 1 to entry: Variant: quality level, which in a sampling plan, corresponds to a specified but re
35、latively high probability of acceptance. 4 Quality assurance 4.1 General The manufacturer shall be capable of providing a continuous production of bolts complying with the quality requirements specified in this document. It is recommended that the manufacturer implement a recognized quality manageme
36、nt system. The purpose of qualification inspections 1)of bolts is to check that the design and manufacturing conditions of a bolt allow it to satisfy the requirements of this document. Quality documentation for parts produced in accordance with this document shall be maintained for a minimum period
37、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 but representative of the actual conditions of use, with the uncertainty inherent in statistical sampling, that the bolt satisfies the requirements of this
38、 document. Production acceptance inspections shall be carried out by the manufacturer or under his responsibility. 4.2 Qualification inspection conditions Unless otherwise specified, the inspection shall be carried out on: each type and diameter of bolt; 25 bolts selected from a single inspection lo
39、t by simple random sampling. The test programme may possibly be reduced, or the qualification granted, without inspection: any such decision shall be based on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical. 1) In order
40、 to simplify the text, the term “inspections” used in this document also refers to “inspections and tests”. ISO 2016 All rights reserved 3BS ISO 8168:2016ISO 8168:2016(E) The inspections shall be repeated on any bolt if the manufacturing conditions have been modified. Table 2 indicates the allocatio
41、n of bolt samples for the inspections. 4.3 Acceptance inspection conditions Inspections shall be carried out on each production batch or inspection lot. Bolts from the batch or lot to be inspected shall be selected by simple random sampling. Each bolt may be submitted to several inspections, provide
42、d that none of the characteristics to be verified has been previously altered during any of these inspections. The bolts to be subjected to destructive inspections may be those on which non-destructive inspections have been carried out. If a more stringent inspection is deemed necessary, all or part
43、 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 for the qualification inspection. Production batches or inspection lots declared unacceptable after the production acceptance inspections sh
44、all 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 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 o
45、f “statistical process control” (SPC) When a characteristic is obtained by a controlled statistical process, the manufacturer has the option, in order to declare conformity of the characteristic, to forgo the final systematic sampling provided in this document, if he is capable of formally justifyin
46、g 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 characteristics of the product; analysis of the risks for each implemented process; determination of the parameters and/or characteristics to be re
47、spected under SPC; determination of the capabilities of each process; drawing up of an inspection plan and integration in the manufacturing process; drawing up of routes and control charts (ISO 7870-3, ISO 7870-1, ISO 7870-2); use of control charts for data consolidation; determination of the audits
48、 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 qualifying body, either during the qualification phase, or a posteriori according to the case, by analysing the justificatory file and the r
49、esults 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 durability test. 5 Requirements The 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 spe
