BS ISO 5857-2008 en_3784 Aerospace - Bolts with MJ threads made of alloy steel strength class 1250 MPa - Procurement specification《航空航天系列.强度等级1250MPa带MJ螺纹合金钢制螺栓.采购规范》.pdf

1、BS ISO 5857:2008 ICS 49.030.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Aerospace Bolts, with MJ threads, made of alloy steel, strength class 1 250 MPa Procurement specificationThis British Standard was published under the authority of the Standards Pol

2、icy and Strategy Committee on 30 September 2008 BSI 2008 ISBN 978 0 580 55026 3 Amendments/corrigenda issued since publication Date Comments BS ISO 5857:2008 National foreword This British Standard is the UK implementation of ISO 5857:2008. It supersedes BS A 299:1989 which is withdrawn. The UK part

3、icipation 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 request to its secretary. This publication does not purport to include all the necessary provisions of a contr

4、act. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 5857:2008Reference number ISO 5857:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 5857 Second edition 2008-08-15 Aerospace Bolts, with MJ threads, made of alloy

5、 steel, strength class 1 250 MPa Procurement specification Aronautique et espace Vis filetages MJ, en acier alli, de classe de rsistance 1 250 MPa Spcification dapprovisionnement BS ISO 5857:2008 ISO 5857:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes

6、licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. Th

7、e ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care ha

8、s been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no par

9、t of this publication may be reproduced 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 5

10、6 CH-1211 Geneva 20 Tel. + 41 22 749 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 5857:2008 ISO 5857:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms

11、 and definitions. 2 4 Quality assurance. 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 st

12、ress durability loads . 21 Annex B (informative) Cross-sectional areas and formulae for double shear loads 23 BS ISO 5857:2008 ISO 5857:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO

13、 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 a technical committee has been established has the right to be represented on that committee. International organizations, gover

14、nmental and non-governmental, in liaison 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 D

15、irectives, Part 2. The main task of technical 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

16、bodies casting a vote. 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 such patent rights. ISO 5857 was prepared by Technical Committee ISO/TC 20, Aircraft and space veh

17、icles, Subcommittee SC 4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO 5857:1988) which has been technically revised. BS ISO 5857:2008 INTERNATIONAL STANDARD ISO 5857:2008(E) ISO 2008 All rights reserved 1 Aerospace Bolts, with MJ threads, made of alloy

18、 steel, strength class 1 250 MPa Procurement 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

19、 in a definition document. 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.

20、 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 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface textur

21、e ISO 5855-2, Aerospace MJ threads Part 2: 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 Tens

22、ile testing at ambient temperature ISO 7870-1, 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

23、 BS ISO 5857:2008 ISO 5857:2008(E) 2 ISO 2008 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 all

24、oy), having the same definition document number, 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 d

25、ocument document specifying directly or indirectly 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 transcrystallin

26、e in character 3.5 seam open surface defect 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 NO

27、TE These particles can be isolated or arranged 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 f

28、unction of the size of the batch and the acceptance 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

29、number (supplementary information taken from ISO 2859-1). BS ISO 5857:2008 ISO 5857:2008(E) ISO 2008 All rights reserved 3 3.11 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining or depending up

30、on the considered product (bolt), or that is likely 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

31、 defect defect that is not likely to materially 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 samplin

32、g plan quality limit which corresponds to a specified 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

33、Standard, the limiting quality quoted in Table 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 ave

34、rage NOTE Variant: quality limit which, in a sampling 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 t

35、his International Standard. It is recommended that the manufacturer be certified to a recognized quality management system. The certification authority may be the prime contractor. The purpose of qualification inspections 2)of bolts is to check that the design and manufacturing conditions of a bolt

36、allow it to satisfy the requirements of this International 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 purch

37、asers country, or their appointed representative, 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 5857:2008 ISO 5857:2008(E) 4 ISO 2008 All rights reservedThe purpose of a pro

38、duction 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 International Standard. Producti

39、on 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 lot by simple random

40、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. The inspections shall be repea

41、ted 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 conditions Inspections shall be carried out on each production batch or inspection lot. Bolts from the batch or lot to be inspected shal

42、l be selected by simple random sampling. Each bolt 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 ins

43、pections 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 for the qualification inspection. Production

44、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 caused the rejection shall be verified using

45、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 conformity of the characteristic, to forgo

46、the final systematic sampling provided in this International 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; analys

47、is 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; BS ISO 5857:2008 ISO 5857:2008(E) ISO 2008 All rights reserved 5 drawing up of an inspection plan and integration in the

48、manufacturing process; drawing up of routes and control 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 b

49、e 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 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 ar