1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 12273:2010Aerospace Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 C, 900 MPa (at amb
2、ient temper-ature)/315 C and 900 MPa (at ambient temperature)/425 C DimensionsBS ISO 12273:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12273:2010. Itsupersedes BS A320:1997 which is withdrawn.The UK participation in its preparation was entrusted to Tec
3、hnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication.
4、 BSI 2010ISBN 978 0 580 70097 2ICS 49.030.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2010.Amendments issued since publicationDate Text affectedBS
5、 ISO 12273:2010Reference numberISO 12273:2010(E)ISO 2010INTERNATIONAL STANDARD ISO12273Second edition2010-09-01Aerospace Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/315 C and
6、900 MPa (at ambient temperature)/425 C Dimensions Aronautique et espace crous river, freinage interne, flottants, orientables, double patte, filetage MJ, classifications: 900 MPa ( temprature ambiante)/235 C, 900 MPa ( temprature ambiante)/315 C et 900 MPa ( temprature ambiante)/425 C Dimensions BS
7、ISO 12273:2010ISO 12273:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes 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 edi
8、ting. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The 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
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10、 the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part 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 e
11、ither 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 2010 All rights reservedBS ISO 12273:2010ISO
12、 12273:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is 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 me
13、mber 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 liaison with ISO, also take part in the work. ISO collaborates closely with the International E
14、lectrotechnical 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 technical committees is to prepare International Standards. Draft International Standards ad
15、opted 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 drawn to the possibility that some of the elements of this document may be the subject of pa
16、tent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12273 was prepared 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 12273:199
17、7), of which it constitutes a minor revision. BS ISO 12273:2010ISO 12273:2010(E) iv ISO 2010 All rights reservedIntroduction The dimensions specified in this International Standard have been determined to satisfy the requirements of the procurement specification of ISO 5858. BS ISO 12273:2010INTERNA
18、TIONAL STANDARD ISO 12273:2010(E) ISO 2010 All rights reserved 1Aerospace Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 C, 900 MPa (at ambient temperature)/315 C and 900 MPa (at ambient temperature)/425 C Dimensio
19、ns 1 Scope This International Standard specifies the dimensions of floating, self-aligning, two lug anchor nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, of the following classifications: 900 MPa/235 C; 900 MPa/315 C; 900 MPa/425 C. NOTE 1 The fi
20、rst element in the classifications (900 MPa) corresponds to the minimum tensile stress that the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. NOTE 2 The second element in the classifications is the maximum temperature
21、 that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the material or by the surface treatment. This International Standard is only applicable for the compilation of aer
22、ospace product standards. 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.
23、ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 8788, Aerospace Nuts, metric Tolerances of form and position 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 b
24、efore the application of any lubricant. BS ISO 12273:2010ISO 12273:2010(E) 2 ISO 2010 All rights reservedTolerances of form and position shall conform to those specified in ISO 8788. Key 1 convex washer 2 threaded element 3 form out-of-round in this area to achieve the self-locking torque requiremen
25、t (tooling marks permissible) 4 cage 5 thread a These values, in micrometers, apply before any surface coating(s) is(are) applied. The values do not apply to threads and sheared edges, the surface texture of which will be as achieved by the usual manufacturing methods. b Axial misalignment: 8 minimu
26、m in any direction from central position. c Float inclusive. Figure 1 Table 1 E F H K L M NbP R S T RadialfloatingZ Diameter code Threadamin. max. max. max. max. min. 0,20+max. min. 050 MJ5 0,8 4H6H 8,75 17,5 3,5 15,2 23,7 8,3 6,6 7,2 0,7 060 MJ6 1 4H5H 4 17 31,6 10,2 0,9 7,6 3 2,5 7,8 080 MJ8 1 4H5
27、H 12,7 25,4 5 20,5 32,6 11,8 1,1 11 3,5 3 8,4 0,75 a In accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. b Is applicable at the rivet hole location.BS ISO 12273:2010ISO 12273:2010(E) ISO 2010 All rights reserved 3Bibliography 1 ISO 5858, Aerospa
28、ce Nuts, self-locking, with maximum operating temperature less than or equal to 425 C Procurement specification BS ISO 12273:2010ISO 12273:2010(E) ICS 49.030.30 Price based on 3 pages ISO 2010 All rights reserved This page deliberately left blankBSI is the independent national body responsible for p
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