1、 Reference number ISO 7689:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 7689 Second edition 2008-10-01 Aerospace Bolts, with MJ threads, made of alloy steel, strength class 1 100 MPa Procurement specification Aronautique et espace Vis filetages MJ, en acier alli, de classe de rsistance 1 100 MPa Spcif
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6、iting 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 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 7689
7、:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms 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)
8、” 4 5 Requirements 5 Annex A (informative) Cross sectional areas and formulae for tensile loads . 19 Annex B (informative) Cross section areas and formulae for double shear loads . 21 ISO 7689:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is
9、 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 a technical committee has been established has the right to be represen
10、ted 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 matters of electrotechnical standardization. International Standards are dr
11、afted in accordance with the rules given in the ISO/IEC Directives, 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 S
12、tandard requires approval by at least 75 % of the member 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 7689 was prepared
13、 by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO 7689:1988), which has been technically revised. INTERNATIONAL STANDARD ISO 7689:2008(E) ISO 2008 All rights reserved 1 Aerosp
14、ace Bolts, with MJ threads, made of alloy steel, strength class 1 100 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 1 100 MPa, for aerospace construction. I
15、t is applicable whenever it is referenced 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 doc
16、ument (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 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and proced
17、ures for the assessment of surface texture ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials Roc
18、kwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 7870-1, Control charts Part 1: General guidelines ISO 7961, Aerospace Bolts Test methods ISO 7966, Acceptance control charts
19、ISO 8258, Shewhart control charts ISO/TR 13425, Guidelines for the selection of statistical methods in standardization and specification ISO 7689:2008(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
20、 batch quantity of finished bolts, manufactured using the same process, from a single material cast (single heat of alloy), having the same number of definition document, same thread and diameter code, heat treated together to the same specified condition and produced as one continuous run 3.2 inspe
21、ction lot quantity of bolts from a single production batch having the same number of definition document 3.3 definition document document specifying directly or indirectly all the requirements for bolts NOTE The definition document can be an International Standard, an in-house standard or a drawing.
22、 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 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
23、 hollow area at thread crest 3.8 inclusions non-metallic particles originating from the material manufacturing process NOTE 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 to r
24、each 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 acceptance number number of defective items acceptable (Ac) 1) . 3.10 simple random sampling sampling of n items from a population of N
25、 items in such a way that all possible combinations of n items have the same probability of being chosen 1) Supplementary information taken from ISO 2859-1. ISO 7689:2008(E) ISO 2008 All rights reserved 3 3.11 critical defect defect that, according to judgement and experience, is likely to result in
26、 hazardous or unsafe conditions for individuals using, maintaining or depending upon 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 a failure or to reduce materiall
27、y the usability of the considered product (bolt) for its intended purpose 3.13 minor defect defect that is not likely to reduce materially the usability of the considered product (bolt) for its intended purpose, or that is a departure from the established specification having little bearing on the e
28、ffective use or operation of this product 3.14 limiting quality LQ sampling plan quality limit that 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
29、 this quality would occur. NOTE 2 For the purposes of this International 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 the maximum number of defects per hundred units) that, for pur
30、poses of sampling inspection, can be considered satisfactory as a process average 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 continuous production
31、of bolts complying with the quality requirements specified in this 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 t
32、o check that the design and manufacturing conditions of a bolt allow it to satisfy the requirements of this International Standard. Quality documentation for parts produced in accordance to this International Standard shall be maintained for a minimum period of 10 years. Qualification of the bolts s
33、hall be granted by the certification authorities in the purchasers 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”. ISO 7689:2008(E) 4 ISO 2
34、008 All rights reservedThe purpose of production acceptance inspection of a bolt is to check, as simply as possible, using a method which is inexpensive but the most representative of the actual conditions of use, with the uncertainty inherent in statistical sampling, that the bolts satisfy the requ
35、irements of this International Standard. 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 selec
36、ted 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 based on the results obtained on similar types and diameters of bolt provided that the design and manufacturing conditio
37、ns are identical. 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 conditions Inspections shall be carried out on each production batch or inspection lot.
38、Bolts 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 i
39、nspections 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 sub
40、mitted for 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) th
41、at caused the rejection shall be verified using a sample of twice the normal size but with the same number of acceptable defective items. 4.4 Use of “statistical process control (SPC)” When a characteristic is obtained by a controlled statistical process, in order to declare conformity of the charac
42、teristic, the manufacturer has the possibility of refraining from the final systematic sampling provided for 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 followi
43、ng 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 respected under SPC; determination of the capabilities of each process; drawing up of an inspection plan and integration in
44、the manufacturing process; ISO 7689:2008(E) ISO 2008 All rights reserved 5 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 devi
45、ce. To be usable in production, this process shall or should 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 results of the qualification inspections such as provided for in Clau
46、se 5. Such an SPC process is not applicable to destructive tests. 5 Requirements The requirements of this International Standard are given in Table 1 and, unless otherwise specified, they apply to bolts ready for use. The test temperature, unless otherwise specified, shall be the ambient temperature
47、. These requirements complement the requirements of all other standards or specifications referenced in the definition document. Table 1 Requirements and test methods Subclause Characteristic Requirement Inspection and test method Desig- nation aSample size 5.1 Material In accordance with the defini
48、tion document. See material standard. As required by semi- finished product Q 20 5.2 Dimensions In accordance with the definition document. Standard gauging A Tables 3 and 4 5.3 Manufacturing Q The heads of the bolts shall be formed by a hot or cold forging process before heat treatment. According t
49、o the route of manufacture. 5.3.1 Forging In the case of hot forging, the equipment shall ensure an adequate and uniform temperature throughout the production batch. The equipment used shall be approved. Q 5.3.2 Heat treatment The forged blanks shall be heat- treated to produce the properties required by the definition document. Blanks shall not be heat-treated more than twice. According to the process route. The equipment used shall be approved. 5.3.3 Removal of surface co
