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1、INTERNATIONAL STANDARD IS0 12126 First edition 1997-l l-01 Prevailing torque type all-metal hexagon nuts with flange with metric fine pitch thread - Product grades A and B , a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provide
2、d by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD Q IS0 IS0 12126:1997(E) Prevailing torque type all metal hexagon nuts with flange with m
3、etric fine pitch thread - Product grades A and B 1 scope This International Standard specifies the characteristics of prevailing torque type all metal hexagon nuts with flange and metric fine pitch thread with nominal thread diameters d from 8 mm up to and including 20 mm, in product grade A for siz
4、es d d 16 mm and product grade 6 for sizes d 16 mm, and with property classes 6,8 and 10. If other specifications are required, they should be selected from existing International Standards, for example IS0 261, IS0 965-2, IS0 2320 and IS0 4759-l. 2 Normative references The following standards conta
5、in provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigat
6、e the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 225:1983, Fasteners - Bolts, screws, studs and nuts - Symbols and designations of dimensions. IS0 261:-l , IS0 general pu
7、rpose metric screw threads - General plan. IS0 965-2:-“, IS0 general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality. IS0 2320: 1997, Prevailing torque type steel hexagon nuts - Mechanical and performance properties. IS0 3
8、269: 1988, Fasteners -Acceptance inspection. IS0 4042:-3 , Fasteners - Electroplated coatings. IS0 4759-l:-“, Tolerances for fasteners - Part 1: Bolts, screws, studs and nuts - Product grades A, B and C. IS0 6157-2:1995, Fasteners - Surface discontinuities - Part 2: Nuts. IS0 8992: 1986, Fasteners -
9、 General requirements for bolts, screws, studs and nuts. 1) To be published. (Revision of IS0 261:1973) 2) To be published. (Revision of IS0 965-2:1980) 3) To be published. (Revision of IS0 4042:1989) 4) To be published. (Revision of IS0 4759-I:19781 Copyright International Organization for Standard
10、ization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 12126:1667(E) 3 Dimensions See figure 1 and table 1. Symbols and designations of dimensions
11、are specified in IS0 225. 1) Prevailing torque element, shape optional. 2) m, is the wrenching height; see note to table 1. 3) B= so” to 1200 4) s= 15O to 25” 5) c is measured at dw,h 6) Edge contour optional. Figure 1 Copyright International Organization for Standardization Provided by IHS under li
12、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 IS0 12126:1997(E) Table 1 - Dimensions Dimensions in millimetres Thread (d x P”) M8xl MlOxl M12xl,5 (Ml4 x 1,5)” Ml6 x 1,5 M
13、20 x 1,5 MlOx1,25 1 M12x1,25 1 I c min. 12 1,5 I 13 I a1 a4 3 4 max. 8,75 10,8 13 15.1 17.3 21,6 min. 8.00 IO,0 12 14,o 16,0 20,o max. I 173 I 21,8 1 26 I 293 I 34,5 I 42,8 min. I 1588 1 19,6 1 233 1 27,6 I 313 I 393 I e min. I 14,38 1 16,64 1 20,03 1 23,36 1 26 1 32 95 the product passes the gaugin
14、g given in annex A, the requirements for dimensions e, c and m, 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without lice
15、nse from IHS -,-,- IS0 12126:1997(E) 0 is0 4 Requirements and reference International Standards See table 2. Material Table 2 - Requirements and reference international Standards I .Steei I I General requirements international Standard I IS0 8992 I Thread Mechanical and Performance Properties Tolera
16、nce international Standards Property class Style decisive for mechanical properties” international Standard 6H IS0 261, IS0 965-2 6 8 10 1 ds16mm d16mm style style 2 style 1 style 2 IS0 2320 I I I Tolerances Product grade International Standard Fords 16 mm:A Ford t6mm: B is0 4759-l As processed Requ
17、irements for etectropfated coatings are covered in fS0 4942. Finish if different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier. Limits for surface discontinuities are covered in IS0 6157-2. Acceptabil
18、ity For acceptance procedure, see IS0 3269. 1) Based on the nut height (dimension h,) nuts in accordance with this international Standard are of style 2. However, since for style 2 IS0 2320 does not specify mechanical properties for ail property classes and sizes as specified in this international S
19、tandard, in some cases nuts have to be tested according to style 1. 5 Designation EXAMPLE A prevailing torque type hexagon all-metal nut with flange, with thread Ml2 x 1,5 and property class 8 is designated as follows: Prevailing torque type hexagon nut with flange IS0 12126 - Ml2 x 1,5 - 8 Copyrigh
20、t International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- Annex A (normative) Gauging of hexagon nuts with flange
21、 IS0 12126:1997(E) A.1 Recommended method for gauging of hexagon (see figure A.1 and table A.l) 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 plac
22、ed over the hexagon and shall be seated on the flange. 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 of flange (see figure A.1 and table A-1) Gauge C is a flat feeler or ring gauge. It is used to prove
23、 that the flange thickness at the junction of the gauge with the hexagon portion is equal to or greater than specified values. The acceptance criterion is that gauge C will fit under gauge A without contact when the nut is seated on a flat plate. NOTE - W, , = ethmretical W b.max = emin- WI mm T a,m
24、ax = mwrnin Key 1 Gauge A 2 Gauge B 3 Gauge C Figure A.1 Table A.1 Dimensions in miilimetres Nominal Gauge A Gauge B Gauge C thread diameter w, T Wb Tb WC *c d max. min. max. min. max. min. min. min. max. min. 8 15,02 15,Ol 4,60 4,59 14.37 14.36 4 20 1,31 I,30 10 17,33 17,32 5,60 5,59 16.63 16,62 5
25、24 I,81 I,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 a,89 26,74 26.73 6 37 2,96 2,95 20 34,65 34.64 IO,70 IO,69 32,94 32,93 6 45 3,70 3,69 5 Copyright International Organization for Standardization Provided by IHS
26、 under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 12126:1997(E) Q IS0 ICS 21 JI60.20 Uescriptors: fastenem, fine pitch threads, nuts (fastenen), self-locking nuts, h
27、exagonal nuts, flanged nuts, specifications, dimensions, designation, gauging. Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,-