1、BRITISH STANDARD BS ISO 12256:2002 Aerospace Drives, internal, cruciform, ribbed Metric series ICS 49.030.20 Incorporating corrigendum November 2009National foreword This British Standard is the UK implementation of ISO 12256:2002, incorporating corrigendum November 2009. The start and finish of tex
2、t introduced or altered by corrigendum is indicated in the text by tags. Text altered by ISO corrigendum November 2009 is indicated in the text by . The UK participation in its preparation was entrusted to Technical Committee ACE/12/1, Aerospace fasteners, fastening systems, details and parts (inter
3、national). A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer i
4、mmunity from legal obligations. BS ISO 12256:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 26 September 2002 BSI 2010 Amendments/corrige
5、nda issued since publication Date Comments 30 April 2010 Implementation of ISO corrigendum November 2009 ISBN 978 0 580 69799 9Reference number ISO 12256:2002(E) INTERNATIONAL STANDARD ISO 12256 First edition 2002-09-01 Aerospace Drives, internal, cruciform, ribbed Metric series Aronautique et espac
6、e Empreintes cruciformes, avec saillies antidrapantes Srie mtrique BSISO12256:2002 ii BSISO12256:2002 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 norm
7、ally 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 and non-governmental, in liaison with ISO, also take part in t
8、he 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, Part 3. The main task of technical committees is to prepare
9、 International Standards. 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. Attention is drawn to the possibility that some
10、 of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12256 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. B
11、SISO12256:2002 1Aerospace Drives, internal, cruciform, ribbed Metric series 1 Scope This International Standard specifies the dimensions of metric internal cruciform ribbed drives used in metric screws in the nominal thread diameter range of 3 mm to 20 mm. Drivers and gauges used in conjunction with
12、 these drives are defined in ISO 14280 and ISO 14281. 3 Configuration and dimensions See Figures 1, 2, 3 and 4 and Tables 1, 2, 3 and 4. Dimensions and tolerances are expressed in millimetres. The presentation of the location tolerances conforms to ISO 1101. 4 Designation The drive designation shall
13、 be as follows: BSISO12256:2002 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) app
14、lies. ISO 3202, Aerospace Screws, pan head, internal offset cruciform ribbed or unribbed drive, threaded to head, MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa Dimensions ISO 5856, Aerospace Screws, 100 degrees normal countersunk head, internal o
15、ffset cruciform ribbed or unribbed drive, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa Dimensions ISO 7913, Aerospace Bolts and screws, metric Tolerances of form and position ISO 13921, Aerospace Screws, 100
16、degrees reduced countersunk head, internal offset cruciform ribbed or unribbed drive, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa Dimensions 2 aValues of parameters for specified heads are listed in Tables 2
17、, 3 and 4. bThis location tolerance applies to all head configurations. cAs defined in ISO 7913. Figure 1 Configuration Drive BSISO12256:2002 3 Table 1 Dimensions Drive C G M N B F R T V Drive code Drive code nom. tol. 0 01 5 nom. tol. 0,05 0 +K 0 0,05 01 5 0 + max. nom. tol. U nom. tol. inches aR1
18、0,96 0 0,03 138 0,53 0 0,05 1,27 0,3 0,46 7 0,6 0,1 1,83 0 0,2 1 R2 1,47 140 0,74 2,29 0,6 0,84 0,7 0,3 3,12 2 R3 2,41 146 0,81 3,81 1 2,03 5 45 0,8 4,5 3 R4S 6,2 4S R4L 3,48 153 1,27 5,08 1,3 2,44 0,9 0,13 0 0,05 0,4 7,11 0 0,3 4L R5 5,76 0,03 162 46 1,78 0 0,08 7,9 2,1 4,09 7 1,1 0,18 0 0,08 0,6 1
19、0,59 0 0,4 5 aFor information and comparison purposes only. BSISO12256:20024 aGauge penetration Figure 2 Configuration Drive in normal 100 countersunk head Table 2 Dimensions Drive in normal 100 countersunk head H J Gauge penetration Screw normal shank or thread diameteraDrive code max. min. max. mi
20、n. max. min. 3 R1 2,97 2,64 1,98 1,57 1,803 1,397 3,5 3,91 3,58 2,18 1,60 1,905 1,321 4 4,29 3,96 2,57 1,98 2,286 1,702 5 R2 4,67 4,34 2,95 2,36 2,667 2,083 6 6,27 5,94 3,43 2,84 2,997 2,413 7 R3 6,81 6,48 3,96 3,38 3,531 2,946 8 8,05 7,72 4,27 3,71 3,759 3,200 10 R4S 8,66 8,33 4,91 4,34 4,394 3,835
21、 12 9,60 9,27 5,84 5,28 5,334 4,775 14 R4L 10,77 10,44 7,01 6,45 6,502 5,944 16 13,11 12,52 7,14 6,48 6,299 5,639 18 14,15 13,56 8,18 7,52 7,341 6,680 20 R5 14,66 14,07 8,69 8,03 7,849 7,188 aNormal 100 countersunk head as defined in ISO 5856. BSISO12256:2002 5aGauge penetration Figure 3 Configurati
22、on Drive in reduced 100 countersunk head Table 3 Dimensions Drive in reduced 100 countersunk head H J Gauge penetration Screw normal shank or thread diameter aDrive code max. min. max. min. max. min. 4 3,91 3,58 2,18 1,60 1,905 1,321 5 4,29 3,96 2,57 1,98 2,286 1,702 6 R2 4,42 4,09 2,69 2,11 2,413 1
23、,829 7 5,92 5,59 3,07 2,49 2,642 2,057 8 R3 6,27 5,94 3,43 2,84 2,997 2,413 10 R4S 8,05 7,72 4,27 3,71 3,759 3,200 12 9,25 8,92 5,49 4,93 4,978 4,420 14 9,98 9,65 6,22 5,66 5,715 5,156 16 R4L 10,77 10,44 7,01 6,45 6,502 5,944 18 13,11 12,52 7,14 6,48 6,299 5,639 20 R5 14,15 13,56 8,18 7,52 7,341 6,6
24、80 aReduced 100 countersunk head as defined in ISO 1392 . BSISO12256:2002 16 aGauge penetration Figure 4 Configuration Drive in pan head Table 4 Dimensions Drive in pan head H J Gauge penetration Screw normal shank or thread diameter aDrive code max. min. max. min. max. min. 3 R1 2,72 2,39 1,73 1,32
25、 1,549 1,143 3,5 3,91 3,58 2,18 1,60 1,905 1,321 4 4,04 3,71 2,31 1,73 2,032 1,448 5 R2 4,80 4,47 3,07 2,49 2,794 2,210 6 6,55 6,22 3,71 3,12 3,277 2,692 7 R3 6,81 6,48 3,96 3,38 3,531 2,946 8 R4S 8,48 8,15 4,72 4,17 4,216 3,658 10 9,60 9,27 5,84 5,28 5,334 4,775 12 R4L 10,39 10,06 6,63 6,07 6,121 5
26、,563 aPan head as defined in ISO 3202. BSISO12256:2002 71) To be published. (Revision of ISO 1101:1983) BSISO12256:2002 Bibliography 1 ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out 2 ISO 14280, Aerospace Drivers, ribb
27、ed, for internal cruciform ribbed or unribbed drives Metric series 3 ISO 14281, Aerospace Gauges, for internal cruciform ribbed or unribbed drives Metric series BSI Group Headquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standards BSI - British
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