1、BS ISO 5857:2008ICS 49.030.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace Bolts,with MJ threads,made of alloy steel,strength class 1 250MPa ProcurementspecificationThis British Standardwas published underthe authority of theStandards Policy andStrat
2、egy Committee on 30September 2008 BSI 2008ISBN 978 0 580 55026 3Amendments/corrigenda issued since publicationDate CommentsBS ISO 5857:2008National forewordThis British Standard is the UK implementation of ISO 5857:2008. Itsupersedes BS A 299:1989 which is withdrawn.The UK participation in its prepa
3、ration was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible
4、for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 5857:2008Reference numberISO 5857:2008(E)ISO 2008INTERNATIONAL STANDARD ISO5857Second edition2008-08-15Aerospace Bolts, with MJ threads, made of alloy steel, strength class 1 250 MPa Pr
5、ocurement specification Aronautique et espace Vis filetages MJ, en acier alli, de classe de rsistance 1 250 MPa Spcification dapprovisionnement BS ISO 5857:2008ISO 5857:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be p
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9、ced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749
10、 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 5857:2008ISO 5857:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Quality assuranc
11、e. 3 4.1 General. 3 4.2 Qualification inspection conditions 4 4.3 Acceptance inspection conditions . 4 4.4 Use of “statistical process control (SPC)”. 4 5 Requirements 5 Annex A (informative) Cross-sectional areas and formulae for tensile, tension fatigue and stress durability loads . 21 Annex B (in
12、formative) Cross-sectional areas and formulae for double shear loads 23 BS ISO 5857:2008ISO 5857:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
13、International Standards is normally carried out through ISO technical committees. 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 liaiso
14、n with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of tec
15、hnical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is dra
16、wn 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 such patent rights. ISO 5857 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fas
17、tener systems. This second edition cancels and replaces the first edition (ISO 5857:1988) which has been technically revised. BS ISO 5857:2008INTERNATIONAL STANDARD ISO 5857:2008(E) ISO 2008 All rights reserved 1Aerospace Bolts, with MJ threads, made of alloy steel, strength class 1 250 MPa Procurem
18、ent specification 1 Scope This International Standard specifies the characteristics and quality assurance requirements for MJ thread bolts made of alloy steel, of strength class 1 250 MPa, for aerospace construction. It is applicable whenever it is referenced in a definition document. 2 Normative re
19、ferences 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. ISO 2859-1:1999, Sampling procedures for
20、 inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection 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
21、: Limit dimensions for bolts and nuts ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 6892, Metallic materials Tensile testing at ambient temperature ISO 78
22、70-1, Control charts Part 1: General guidelines ISO 7961, Aerospace Bolts Test methods ISO 7966, Acceptance control charts ISO 8258, Shewhart control charts ISO/TR 13425, Guidelines for the selection of statistical methods in standardization and specification BS ISO 5857:2008ISO 5857:2008(E) 2 ISO 2
23、008 All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 production batch quantity of finished bolts, manufactured using the same process, from a single material cast (single heat of alloy), having the same definition document n
24、umber, the same thread and diameter code, heat-treated together to the same specified condition and produced as one continuous run 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 in
25、directly all the requirements for bolts NOTE The 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 open surface defec
26、t 3.6 lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging 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 These particles can be isolated or arra
27、nged in strings. 3.9 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly reach a decision NOTE In this International Standard, each sampling plan specifies the number of bolts to be inspected as a function of the size of the batch and the a
28、cceptance number number of defective items acceptable (Ac)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 1) Ac = acceptance number (supplementary information taken from
29、 ISO 2859-1). BS ISO 5857:2008ISO 5857:2008(E) ISO 2008 All rights reserved 33.11 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 (bolt), or that is l
30、ikely to prevent performance of the function of a major end item 3.12 major defect defect, other than critical, that is likely to result in failure or to reduce materially the usability of the considered product (bolt) for its intended purpose 3.13 minor defect defect that is not likely to materiall
31、y reduce the usability of the considered product (bolt) for its intended purpose, or that constitutes a departure from the established specification, having little bearing on the effective use or operation of this product 3.14 limiting quality LQ sampling plan quality limit which corresponds to a sp
32、ecified and relatively low 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 International Standard, the limiting quality quoted in Table
33、 4 corresponds to a probability of acceptance of 10 %. 3.15 acceptable quality limit AQL maximum percent defective (or maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average NOTE Variant: quality limit which, in a s
34、ampling plan, corresponds to a specified but relatively 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 International Standard. It is recommended
35、that the manufacturer be certified to a recognized quality management system. The certification authority may be the prime contractor. The purpose of qualification inspections2)of bolts is to check that the design and manufacturing conditions of a bolt allow it to satisfy the requirements of this In
36、ternational Standard. Quality documentation for parts produced in accordance with this International Standard shall be maintained for a minimum period of 10 years. Qualification of the bolts shall be granted by the Certification Authorities in the purchasers country, or their appointed representativ
37、e, who may be the prime contractor. 2) In order to simplify the text, the term “inspections” used in this International Standard also refers to “inspections and tests”. BS ISO 5857:2008ISO 5857:2008(E) 4 ISO 2008 All rights reservedThe purpose of a production acceptance inspection of a bolt is to ch
38、eck, 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 International Standard. Production acceptance inspections shall be carried out b
39、y 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 lot by simple random sampling. The test programme may possibly be red
40、uced, 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. The inspections shall be repeated on any bolt if the manufacturing conditions
41、have been modified. Table 2 indicates the allocation 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 bo
42、lt may be submitted to several inspections, provided that none of 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 string
43、ent 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 for the qualification inspection. Production batches or inspection lots declared unacceptable
44、 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 caused the rejection shall be verified using a sample of twice the normal size with the same
45、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 conformity of the characteristic, to forgo the final systematic sampling provided in this I
46、nternational Standard, 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 characteristics of the product; analysis of the risks for each implemented process; de
47、termination of the parameters and/or characteristics to be respected under SPC; determination of the capabilities of each process; BS ISO 5857:2008ISO 5857:2008(E) ISO 2008 All rights reserved 5 drawing up of an inspection plan and integration in the manufacturing process; drawing up of routes and c
48、ontrol charts (ISO 7966, ISO 7870-1, ISO 8258); 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 qualifying body, ei
49、ther 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 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 International Standard are given in Table 1 and, unless otherwise specified, they apply to bolts that are ready for use. The test temperature, unless otherw
