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1、BRITISH STANDARD AEROSPACE SERIES BS A 342:1999 ISO 9139:1998 Nuts, plain or slotted (castellated) Procurement specification ICS 49.030.30 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 This Brit
2、ish Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 BSI 05-1999 ISBN 0 580 32260 2 National foreword This British Standard reproduces verbatim ISO 9139:1998 and
3、 implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquir
4、ers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations rep
5、resented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Corres
6、pondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not
7、 of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 14 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorp
8、orated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 BSI 05-199
9、9i Contents Page National forewordInside front cover Forewordiii Text of ISO 91391 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank Univers
10、ity, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 ii BSI 05-1999 Contents Page Forewordiii 1 Scope1 2 Normative references1 3 Term
11、s and definitions1 4 Quality assurance2 4.1 General2 4.1.1 Approval of manufacturers2 4.1.2 Qualification of nuts2 4.1.3 Production acceptance of nuts2 4.2 Qualification inspection and test conditions3 4.3 Production acceptance inspection and test conditions3 4.4 Use of “Statistical process control
12、(SPC)”3 5 Technical requirements3 Annex A (normative) Types of permissible surface discontinuity14 Annex B (informative) Cross-sectional area formula14 Figure A.114 Table 1 Technical requirements4 Table 2 Summary of qualification and production acceptance inspections and tests8 Table 3 Loads to be a
13、pplied in the 80 % axial load test9 Table 4 Loads to be applied in the 100 % axial load test 10 Table 5 Torques to be applied in the stress embrittlement test 11 Table 6 Classification of visual and dimensional inspections11 Table 7 Sampling plans for visual and dimensional inspections12 Table 8 Sam
14、pling plans for the inspection of mechanical and metallurgical characteristics12 Table 9 Maximum depth of permissible surface discontinuities13 Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), specifications, mechanical properties, quality assurance, marking, metric system. L
15、icensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 BSI 05-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member b
16、odies). 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, governmental a
17、nd 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 Directives
18、, Part 3. 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. International Standard ISO 9139 was prepared by Technical Commi
19、ttee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. Annex A forms an integral part of this International Standard. Annex B is for information only. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, U
20、ncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 BSI 05-19991 1 Scope This International Standard specifies the required characteristics for metric plain or slott
21、ed (castellated) nuts, with MJ threads according to ISO 5855-2, for use in aerospace construction. It is applicable to nuts as defined above, provided that reference is made to this International Standard in the relevant definition document. 2 Normative references The following normative documents c
22、ontain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged t
23、o investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1463:1982
24、, Metallic and oxide coatings Measurement of coating thickness Microscopical method. ISO 2859-1:1989, Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. ISO 3452:1984, Non-destructive testing Penetrant inspecti
25、on General principles. ISO 3887:1976, Steel, non-alloy and low-alloy Determination of depth of decarburization. ISO 4288:1996, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture. ISO 5855-2:1988, Aerospace MJ threads Li
26、mit dimensions for bolts and nuts. ISO 7870:1993, Control charts General guide and introduction. ISO 7966:1993, Acceptance control charts. ISO 8258:1991, Shewhart control charts. ISO 8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. ISO 9002:1994, Quality systems Model for qua
27、lity assurance in production, installation and servicing. ISO 9003:1994, Quality systems Model for quality assurance in final inspection and test. ISO 9140:1998, Aerospace Plain or slotted (castellated) nuts Test methods. ISO 9227:1990, Corrosion tests in artificial atmospheres Salt spray tests. ISO
28、/TR 13425:1995, Guide for selection of statistical methods in standardization and specification. 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 definition document document specifying all the requirements for nuts, i.e.: metall
29、urgical; geometrical and dimensional; functional (strength and temperature classes) NOTEThe definition document may be an International Standard, a national standard, an in-house standard or drawing. 3.2 finished nut nut ready for use, inclusive of any possible treatments and/or surface coatings, as
30、 specified in the definition document 3.3 batch definite quantity of some commodity manufactured or produced under conditions which are presumed to be uniform NOTEFor the purposes of this International Standard, a batch is a quantity of finished nuts, of the same type and same diameter, produced fro
31、m a material obtained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments. 3.4 crack rupture in the material which may extend in any direction and which may be
32、 intercrystalline or transcrystalline in character 3.5 seem open surface defect resulting from extension of the metal 3.6 lap folding over of unwelded metal that can arise when the material is formed (drawing) or in the finished product (pressing or forging) 3.7 inclusions non-metallic particles ori
33、ginating from the material manufacturing process NOTEThese particles may be isolated or arranged in strings. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 2 BSI 05-1999 3.8 critical defect defec
34、t 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 3.9 major defect defect other than critical,
35、 that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 3.10 minor defect defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established s
36、pecifications having little bearing on the effective use or operation of this product 3.11 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly reach a decision NOTEFor the purposes of this International Standard, each sampling plan specifie
37、s the number of nuts to be inspected as a function of the size of the batch and the acceptance number number of defective items acceptable (Ac)1). 3.12 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 probab
38、ility of being chosen 3.13 acceptable 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 NOTEVariant: quality level which in a sampling plan corresponds to a s
39、pecified but relatively high probability of acceptance. 3.14 limiting quality LQ (sampling plan) quality level which corresponds to a specified and relatively low probability of acceptance NOTE 1It is the limiting lot quality characteristic that the consumer is willing to accept with a low probabili
40、ty that a lot of this quality would occur. NOTE 2For the purposes of this International Standard, the limiting quality given in Table 7 corresponds to a consumers risk of 10 %. 4 Quality assurance 4.1 General 4.1.1 Approval of manufacturers The manufacturer shall conform to the quality assurance and
41、 approval procedures defined in ISO 9003 for nuts of strength classes less than 1 550 MPa and/or of temperature classes less than 650 C. The manufacturer shall conform to the quality assurance and approval procedures defined by ISO 9002 for nuts of strength classes greater than or equal to 1 550 MPa
42、 and/or of temperature classes greater than or equal to 650 C. The purpose of these procedures is to ensure that a manufacturer has a quality system and the capability for continuous production of nuts complying with the specified quality requirements. Approval of the manufacturer shall be granted b
43、y the Certification Authorities, or their appointed representative, who may be the prime contractor. 4.1.2 Qualification of nuts The purpose of qualification inspections and tests of nuts is to check that the design and manufacturing conditions of a nut allow it to satisfy the requirements of this I
44、nternational Standard. The qualification is applicable to nuts of strength classes greater than or equal to 1 550 MPa and/or of temperature classes greater than or equal to 650 C. It shall be granted by the Certification Authorities in the purchasers country, or their appointed representative, who m
45、ay be the prime contractor. 4.1.3 Production acceptance of nuts The purpose of production acceptance inspection and tests of a nut 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 sta
46、tistical sampling, that the nuts satisfy the requirements of this International Standard. Production acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. The manufacturer is responsible for the quality of the nuts manufactured. 1) Supplementary info
47、rmation taken from ISO 2859-1. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:36:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 342:1999 BSI 05-19993 4.2 Qualification inspection and test conditions Qualification inspections and tests (requirements, meth
48、ods, numbers of nuts) are specified in Table 1. They shall be carried out on: each type and diameter of nut of strength classes greater than or equal to 1 550 MPa and/or of temperature classes greater than or equal to 650 C; 75 nuts selected from a single inspection lot by simple random sampling. Th
49、e test programme may possibly be reduced, or qualification of a nut granted without inspection or testing; any such decision shall be based on the results obtained on similar types and diameters of nuts provided that the design and manufacturing conditions are identical. The inspections and tests shall be repeated on any nut if the supplier or the manufacturing conditions have changed. Qualification inspections and tests are summarized in Table 2. 4.3 Production acceptance inspection and test conditio