1、 ISO 2012 Prevailing torque type all-metal hexagon nuts with flange, style 2 Product grades A and B crous hexagonaux embase, autofreins, tout mtal, style 2 Grades A et B INTERNATIONAL STANDARD ISO 7044 Third edition 2012-09-01 Reference number ISO 7044:2012(E) ISO 7044:2012(E) ii ISO 2012 All rights
2、 reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 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 either ISO at the
3、 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 ISO 7044:2012(E) ISO 2012 All rights reserved iii Contents Page For
4、eword iv 1 Scope 1 2 Normative references . 1 3 Dimensions . 1 4 Requirements and reference International Standards 4 5 Designation . 4 Annex A (informative) Gauging of hexagon nuts with flange . 5 Bibliography . 7 ISO 7044:2012(E) Foreword ISO (the International Organization for Standardization) is
5、 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 right to be represen
6、ted 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. International Standards are dr
7、afted 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 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International S
8、tandard 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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7044 was prepared
9、 by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread. This third edition cancels and replaces the second edition (ISO 7044:1997), of which it constitutes a minor revision. iv ISO 2012 All rights reserved INTERNATIONAL STANDARD ISO 7044:2012(E) Prevai
10、ling torque type all-metal hexagon nuts with flange, style 2 Product grades A and B 1 Scope This International Standard specifies the characteristics of prevailing torque type all-metal hexagon nuts with flange (style 2) and threads M5 to M20 inclusive, in product grade A for threads up to and inclu
11、ding M16 and product grade B for threads above M16, and with property classes 8, 9, 10 and 12. NOTE The dimensions of the nuts correspond to those given in ISO 4161 plus prevailing torque feature. If other specifications are required, they can be selected from existing International Standards, for e
12、xample ISO 261, ISO 724, ISO 898-2, ISO 965-2, ISO 2320 and ISO 4759-1. 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
13、 document (including any amendments) applies. ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensions ISO 261, ISO general purpose metric screw threads General plan ISO 724, ISO general-purpose metric screw threads Basic dimensions ISO 898-2, Mechanical properties of
14、fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes Coarse thread and fine pitch thread ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads Medium quality ISO 2320, Prev
15、ailing torque type steel nuts Mechanical and performance properties ISO 3269, Fasteners Acceptance inspection ISO 4042, Fasteners Electroplated coatings ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO 6157-2, Fasteners Surface discontinuities
16、Part 2: Nuts ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings 3 Dimensions See Figure 1 and Table 1. Symbols and descriptions of dimensions are specified in ISO 225. ISO 2012 All rights reserved 1 ISO 704
17、4:2012(E) aPrevailing torque element, shape is at the discretion of the manufacturer. bm wis the wrenching height; see note to Table 1. c = 90 to 120. d = 15 to 25. ec is measured at d w,min . fContour of the edge is at the discretion of the manufacturer. Figure 1 2 ISO 2012 All rights reserved ISO
18、7044:2012(E) Table 1 Dimensions Dimensions in millimetres Thread D M5 M6 M8 M10 M12 (M14) a M16 M20 P b 0,8 1 1,25 1,5 1,75 2 2 2,5 c min. 1,0 1,1 1,2 1,5 1,8 2,1 2,4 3,0 d a max. 5,75 6,75 8,75 10,80 13,00 15,10 17,30 21,60 min. 5,00 6,00 8,00 10,00 12,00 14,00 16,00 20,00 d c max. 11,8 14,2 17,9 2
19、1,8 26,0 29,9 34,5 42,8 d w min. 9,8 12,2 15,8 19,6 23,8 27,6 31,9 39,9 e min. 8,79 11,05 14,38 16,64 20,03 23,36 26,75 32,95 h max. 6,20 7,30 9,40 11,40 13,80 15,90 18,30 22,40 min. 5,70 6,80 8,74 10,34 12,57 14,80 17,20 20,30 m c min. 4,70 5,70 7,64 9,64 11,57 13,30 15,30 18,70 m w min. 2,5 3,1 4,
20、6 5,6 6,8 7,7 8,9 10,7 s max. 8,00 10,00 13,00 15,00 18,00 21,00 24,00 30,00 min. 7,78 9,78 12,73 14,73 17,73 20,67 23,67 29,16 r d max. 0,3 0,4 0,5 0,6 0,7 0,9 1,0 1,2 NOTE If the product passes the gauging given in Annex A, the requirements for dimensions e, c and m ware satisfied. aThe size in pa
21、rentheses should be avoided if possible. bP is the pitch of the thread. cm is the minumum thread height. dRadius, r, applies both at the corners and the flats of the hexagon. ISO 2012 All rights reserved 3 ISO 7044:2012(E) 4 Requirements and reference International Standards See Table 2. Table 2 Req
22、uirements and reference International Standards Material Steel General requirements International Standard ISO 8992 Thread Tolerance class 6H International Standards ISO 261, ISO 724, ISO 965-2 Mechanical and performance properties Property class 8, 9, 10, 12 International Standard ISO 898-2, ISO 23
23、20 Tolerance Product grade For D 16 mm: A For D 16 mm: B International Standard ISO 4759-1 Finish Coating As processed Requirements for electroplating are specified in ISO 4042. Requirements for non-electrolytically applied zinc flake coatings are specified in ISO 10683. Additional requirements or o
24、ther finishes or coatings shall be agreed between the supplier and the purchaser. Surface integrity Limits for surface discontinuities are specified in ISO 6157-2. Acceptability For acceptance procedure, see ISO 3269. 5 Designation EXAMPLE A prevailing torque type all-metal hexagon nut with flange,
25、thread M12 and of property class 8 is designated as follows: Prevailing torque type hexagon nut with flange ISO 7044 - M12 - 8 4 ISO 2012 All rights reserved ISO 7044:2012(E) Annex A (informative) Gauging of hexagon nuts with flange A.1 Recommended method for gauging of hexagon See Figure A.1 and Ta
26、ble A.1. The nut shall be gauged using two plain ring gauges, A and B, to demonstrate the coincidental acceptability of hexagon height, wrenching height, corner fill and width across corners. Gauge A shall be placed over the hexagon and shall be seated on the flange. Gauge B shall be placed on the t
27、op of the nut normal to the nut axis. The two gauges shall not be in contact. A.2 Recommended method for gauging flange thickness See Figure A.1 and Table A.1. Gauge C is a flat feeler or ring gauge. It is used to prove that the flange thickness at the junction of the gauge with the hexagon portion
28、is equal to or greater than specified values. The acceptance criterion is that gauge C fits under gauge A without contact when the nut is seated on a flat plate. Key 1 gauge A 2 gauge B 3 gauge C NOTE W a,min= e theoreticalW b,max= e min 0,01 mmT a,max= m w,min Figure A.1 ISO 2012 All rights reserve
29、d 5 ISO 7044:2012(E) Table A.1 Dimensions in millimetres Thread Gauge A Gauge B Gauge C D W a T a W b T b W c T c max. min. max. min. max. min. min. min. max. min. M5 9,25 9,24 2,50 2,49 8,78 8,77 3 14 1,08 1,07 M6 11,56 11,55 3,10 3,09 11,04 11,03 4 16 1,19 1,18 M8 15,02 15,01 4,60 4,59 14,37 14,36
30、 4 20 1,31 1,30 M10 17,33 17,32 5,60 5,59 16,63 16,62 5 24 1,81 1,80 M12 20,79 20,78 6,80 6,79 20,02 20,01 5 29 2,20 2,19 M14 24,26 24,25 7,70 7,69 23,35 23,34 6 32,5 2,55 2,54 M16 27,72 27,71 8,90 8,89 26,74 26,73 6 37 2,96 2,95 M20 34,65 34,64 10,70 10,69 32,94 32,93 6 45 3,70 3,69 6 ISO 2012 All rights reserved ISO 7044:2012(E) Bibliography 1 ISO 4161, Hexagon nuts with flange, style 2 Coarse thread ISO 2012 All rights reserved 7ISO 7044:2012(E) ISO 2012 All rights reserved ICS 21.060.20 Price based on 7 pages
