1、BSI Standards PublicationBS ISO 12261:2016Aerospace Screws, panhead, internal offset cruciformribbed or unribbed drive, pitchdiameter shank, long lengthMJ threads, metallic material,coated or uncoated, strengthclasses less than or equal to 1100 MPa DimensionsBS ISO 12261:2016 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of ISO 12261:2016.It supersedes BS A 313:1997 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committe
3、e 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. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 86453 7ICS 49.030.20Comp
4、liance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 12261:2016 ISO 2016Ae
5、rospace Screws, pan head, internal offset cruciform ribbed or unribbed drive, pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa DimensionsAronautique et espace Vis tte cylindrique, empreinte cruciforme dporte, avec o
6、u sans saillies antidrapantes, tige de diamtre gal au diamtre sur flancs et filetage MJ long, en matriau mtallique, revtues ou non revtues, des classes de rsistance infrieures ou gales 1 100 MPa DimensionsINTERNATIONAL STANDARDISO12261Second edition2016-02-15Reference numberISO 12261:2016(E)BS ISO 1
7、2261:2016ISO 12261:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, includin
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9、 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 12261:2016ISO 12261:2016(E)Foreword iv1 Scope . 12 Normative references 13 Configuration and dimensions . 1 ISO 2016 All rights reserved iiiContents PageBS ISO 12261:2016ISO 12261:2016(E)ForewordISO (the International Organization fo
10、r 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 member body interested in a subject for which a technical committee has been established has the
11、 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 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The proced
12、ures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial
13、 rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Details of any patent rights id
14、entified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanatio
15、n on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document i
16、s ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems.This second edition cancels and replaces the first edition (ISO 12261:1996), of which it constitutes a minor revision.iv ISO 2016 All rights reservedBS ISO 12261:2016INTERNATIONAL STANDARD ISO 12261:2016(E)Aerosp
17、ace Screws, pan head, internal offset cruciform ribbed or unribbed drive, pitch diameter shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa Dimensions1 ScopeThis International Standard specifies the dimensions of pan head screws wit
18、h internal offset cruciform ribbed or unribbed drive, pitch diameter shank and long length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa.This International Standard is applicable to the compilation of aerospace product standards.2 Normati
19、ve referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app
20、lies.ISO 3353 (all parts), Aerospace Lead and runout threads ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nutsISO 7913, Aerospace Bolts and screws, metric Tolerances of form and positionISO 14275, Aerospace Drives, internal, offset cruciform, ribbed Metric seriesISO 14276,
21、 Aerospace Drives, internal, offset cruciform Metric series3 Configuration and dimensionsSee Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant.Tolerances of form and position are sp
22、ecified in ISO 7913. ISO 2016 All rights reserved 1BS ISO 12261:2016ISO 12261:2016(E)Break sharp edges 0,1 to 0,4KeyaShape optional.bIn accordance with ISO 3353 (all parts).Figure 1Table 1Diam-eter codeThreadaD1D2D3D4K L1bcdL2bcdL3L4dR TDrive codee 0,13 min.030,nom. tol. nom. tol. min. max. 0,3 nom.
23、 tol. max. min.040 MJ40,7 4h6h 3,54 6,7 8 3,0050,2,4020,0,4 2 1416 to 560,4020,1,6 0,4 R4050 MJ50,8 4h6h 4,48 8,7 10 3,4 0,53,0 0,541620 to 700,5 2,0 0,5 R5060 MJ6 1 4h6h 5,35 10,7 12 4,2 3,6030,0,71822 to 840,72,4 0,6R6070 MJ71 4h6h 6,35 12,7 14 5,2 4,2 2024 to 982,8 0,7080 MJ81 4h6h 7, 35 14,7 16
24、6,2 4,8 2226 to 1123,2 0,8 R8100 MJ101,25 4h6h 9,19 18,7 20 7,9 6,0 0,862632 to 1400,8 4,0 1,0 R10120 MJ121,25 4h6h 11,19 22,7 24 9,8 7, 2 0,9 3036 to 1680,9030,4,8 1,2 R12aIn accordance with ISO 5855-2.bFirst length corresponding to first L4length.cConditions L1min. and L2max. cannot be obtained si
25、multaneously.dIncrements:2 for L4 1004 for L4 100eIn accordance with ISO 14275 or ISO 14276.2 ISO 2016 All rights reservedBS ISO 12261:2016BS ISO 12261:2016ISO 12261:2016(E) ISO 2016 All rights reservedICS 49.030.20Price based on 2 pagesThis page deliberately left blankBSI is the national body respo
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