1、 ISO 2012 Prevailing torque type all-metal hexagon nuts with flange with metric fine pitch thread, style 2 Product grades A and B crous hexagonaux embase, autofreins, tout mtal, filetage mtrique pas fin, style 2 Grades A et B INTERNATIONAL STANDARD ISO 12126 Second edition 2012-09-01 Reference numbe
2、r ISO 12126:2012(E) ISO 12126:2012(E) ii ISO 2012 All rights 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 mic
3、rofilm, without permission in writing from either 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 ISO 121
4、26:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword 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 ISO 12126:2012(E) Foreword ISO (the Inter
5、national 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 member body interested in a subject for which a technical committee has
6、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 Electrotechnical Commission (IEC) on all matters of electrotechnical st
7、andardization. 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 adopted by the technical committees are circulated to the member bodies
8、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 patent rights. ISO shall not be held responsible for identifying any or
9、all such patent rights. ISO 12126 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with metric internal thread. This second edition cancels and replaces the first edition (ISO 12126:1997), of which it constitutes a minor revision. iv ISO 2012 All rights reserved
10、 INTERNATIONAL STANDARD ISO 12126:2012(E) Prevailing torque type all-metal hexagon nuts with flange with metric fine pitch thread, 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),
11、and metric fine pitch thread with nominal thread diameters, D, from 8 mm up to and including 20 mm, in product grade A for sizes D 16 mm and product grade B for sizes D 16 mm, and with property classes 6, 8 and 10. NOTE The dimensions of the nuts correspond to those given in ISO 10663 plus prevailin
12、g torque feature. If other specifications are required, they can be selected from existing International Standards, for example 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 doc
13、ument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced 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 thr
14、eads General plan ISO 724, ISO general-purpose metric screw threads Basic dimensions ISO 898-2, Mechanical properties of 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
15、 Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads Medium quality ISO 2320, Prevailing torque type steel nuts Mechanical and performance properties ISO 3269, Fasteners Acceptance inspection ISO 4042, Fasteners Electroplated coatings ISO 4759-1, Tolerances for
16、 fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO 6157-2, Fasteners Surface discontinuities 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 Figu
17、re 1 and Table 1. Symbols and descriptions of dimensions are specified in ISO 225. ISO 2012 All rights reserved 1 ISO 12126:2012(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 measure
18、d at d w,min . fContour of the edge is at the discretion of the manufacturer. Figure 1 2 ISO 2012 All rights reserved ISO 12126:2012(E) Table 1 Dimensions Dimensions in millimetres Thread (D P a ) M8 1 M10 1 M12 1,5 (M14 1,5) b M16 1,5 M20 1,5 (M10 1,25) b (M12 1,25) b c min. 1,2 1,5 1,8 2,1 2,4 3,0
19、 d a max. 8,75 10,80 13,00 15,10 17,30 21,60 min. 8,00 10,00 12,00 14,00 16,00 20,00 d c max. 17,9 21,8 26,0 29,9 34,5 42,8 d w min. 15,8 19,6 23,8 27,6 31,9 39,9 e min. 14,38 16,64 20,03 23,36 26,00 32,95 h max. 9,40 11,40 13,80 15,90 18,30 22,40 min. 8,74 10,34 12,57 14,80 17,20 20,30 m c min. 7,6
20、4 9,64 11,57 13,30 15,30 18,70 m w min. 4,6 5,6 6,8 7,7 8,9 10,7 s max. 13,00 15,00 18,00 21,00 24,00 30,00 min. 12,73 14,73 17,73 20,67 23,67 29,16 r d max. 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. aP
21、 is the pitch of the thread. bThe size in parentheses should be avoided if possible. 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 12126:2012(E) 4 Requirements and reference International Standards See Table
22、2. Table 2 Requirements 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 6, 8, 10 International Standards ISO 89
23、8-2, ISO 2320 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 requir
24、ements or other 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 Acceptance inspection is specified in ISO 3269. 5 Designation EXAMPLE A prevailing torque type hexagon all-meta
25、l nut with flange, with thread M12 1,5 and of property class 8, is designated as follows: Prevailing torque type hexagon nut with flange ISO 12126 - M12 1,5 - 8 4 ISO 2012 All rights reserved ISO 12126:2012(E) Annex A (informative) Gauging of hexagon nuts with flange A.1 Recommended method for gaugi
26、ng of hexagon See Figure A.1 and Table 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 flang
27、e. Gauge B shall be placed on the top 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
28、the gauge with the hexagon portion is equal to or greater than specified values. The acceptance criterion is that gauge C fits under gauge A without contact where 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 Fi
29、gure A.1 ISO 2012 All rights reserved 5 ISO 12126:2012(E) Table A.1 Dimensions in millimetres Nominal thread diameter Gauge A Gauge B Gauge C W a T a W b T b W c T c D max. min. max. min. max. min. min. min. max. min. 8 15,02 15,01 4,60 4,59 14,37 14,36 4 20 1,31 1,30 10 17,33 17,32 5,60 5,59 16,63
30、16,62 5 24 1,81 1,80 12 20,79 20,78 6,80 6,79 20,02 20,01 5 29 2,20 2,19 14 24,26 24,25 7,70 7,69 23,35 23,34 6 32,5 2,55 2,54 16 27,72 27,71 8,90 8,89 26,74 26,73 6 37 2,96 2,95 20 34,65 34,64 10,70 10,69 32,94 32,93 6 45 3,70 3,69 6 ISO 2012 All rights reservedISO 12126:2012(E) ISO 2012 All rights reserved ICS 21.060.20 Price based on 6 pages
