BS A 327-1998 Nuts bihexagonal self-locking with counterbore and MJ threads classifications 1100 MPa (at ambient temperature) 425 C 1100 MPa (at ambient temperature) 650 C 1210 MPa.pdf

1、BRITISH STANDARD AEROSPACE SERIES BS A 327:1998 ISO 13589: 1998 Nuts, bihexagonal, self-locking, with counterbore and MJ threads, classifications: 1100MPa(atambient temperature)/425 C, 1100MPa (at ambient temperature)/650 C, 1210MPa (at ambient temperature)/425 C, 1210MPa (at ambient temperature)/73

2、0 C, 1550MPa (at ambient temperature)/235 C, 1550MPa (at ambient temperature)/425 C and 1550MPa (at ambient temperature)/600 C Dimensions ICS 49.030.30BSA327:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the St

3、andards Board and comesintoeffect on 15 July 1998 BSI 05-1999 ISBN 0 580 30203 2 National foreword This British Standard reproduces verbatim ISO13589:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fas

4、teners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for

5、change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement internationa

6、l or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all

7、 the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and

8、ii, theISO title page, page ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSA327:1998

9、 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Configuration and dimensions 1 Figure 1 2 Table 1 2ii blankBSA327:1998 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide fed

10、eration 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 represented on that comm

11、ittee. 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. Draft International Standards adopted by the t

12、echnical 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 ISO13589 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee

13、SC4, Aerospace fastener systems. Descriptors: Aircraft industry, fasteners, MJ threads, nuts (fasteners), double hexagonal nuts, self-locking nuts, counterbore nuts, classification dimensions.BSA327:1998 BSI 05-1999 1 Introduction The dimensions specified in this International Standard have been det

14、ermined to satisfy the requirements of the procurement specification of ISO5858 or ISO8641, depending on the classification of the nut. 1 Scope This International Standard specifies the dimensions of bihexagonal nuts with counterbore and MJ threads and a self-locking feature achieved by forming the

15、upper portion out-of-round, for classifications:1100MPa 1) /425 C 2) , 1100 MPa 1) /650 C 2) , 1210 MPa 1) /425 C 2) , 1210MPa 1) /730 C 2) , 1550 MPa 1) /235 C 2) , 1550MPa 1) /425 C 2)and 1550 MPa 1) /600 C 2) . This International Standard is only applicable for the compilation of aerospace produc

16、t standards. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements

17、based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 4095:1998, Aerospace Bi-hexagonal drives Wrenching confi

18、guration Metric series. ISO 5855-2:1988, Aerospace MJ threads Part2:Limit dimensions for bolts and nuts. ISO 5858:1991, Aerospace Self-locking nuts with maximum operating temperature less than or equal to425 C Procurement specification. ISO 8641:1987, Aerospace Self-locking nuts with maximum operati

19、ng temperature greater than425 C Procurement specification. ISO 8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. 3 Configuration and dimensions See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They apply after any surface coating(s) but before

20、 the application of any lubricant. 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able to withstand, without permanent alter

21、ation to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the material or by the surface treatment.BSA327:1998 2 BSI 05-1999 Table 1 NOTETolerances of form and position shall be in conformity with those specified in ISO 8788. Detail

22、s of form not stated are at the manufacturers discretion. 1) These values, in micrometres, apply before any surface coating(s) is (are) applied. The values do not apply to threads the surface texture of which will be as achieved by the usual manufacturing methods. 2) All forms of entry (radius or ch

23、amfer) permissible within these limiting dimensions. Figure 1 Diameter code Thread a E G H K M N S T Wrenching dash number b max. min. max. max. min. min. min. max. 0,2 050 MJ5 0,8-4H6H 5,8 5,2 9,1 11,5 8,3 5,7 2 9,4 4,5 07 060 MJ6 1-4H5H 7,1 6,3 10,6 12,9 9,8 5,95 2,3 10,3 4,75 08 070 MJ7 1-4H5H 8,

24、1 7,3 12,1 14,1 11,3 6,2 2,6 11,1 5 09 080 MJ8 1-4H5H 9,1 8,3 13,6 15,7 12,8 6,45 2,8 12,2 5,25 10 100 MJ10 1,25-4H5H 11,1 10,3 16,8 18,5 15,8 6,7 3,1 14,3 5,5 12 a In accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. b In conformity with ISO 409

25、5 over N min.blankBS A 327:1998 ISO 13589: 1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated b

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