ISO-7040-1997.pdf

INTERNATIONAL STANDARD IS0 7040 Second edition 1997-11-15 Prevailing torque type hexagon nuts (with non-metallic insert), style 1 - Property classes 5,8 and 10 . a=400net: p=iso; o=isocs; sxentrat Printed in Switzerland ii -,-,- INTERNATIONAL STANDARD 0 is0 IS0 7040: 1997(E) Prevailing torque type hexagon nuts (with non-metallic insert), style 1 - Property classes 5,8 and 10 1 scope This international Standard specifies the characteristics of prevailing torque type hexagon nuts (with non-metallic insert), style 1, with threads from M3 up to and including M36, in product grade A for threads up to and including Ml6 and product grade B for threads above M16, and with property classes 5,8 and 10. NOTE - The dimensions of the nuts correspond to those given in IS0 4032 plus prevailing torque feature. 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 contain 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 investigate 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 :- I, IS0 general purpose metric screw threads - General plan. GO 965-2:1 , IS0 general purpose metric screw threads - Tolerances - Part2: 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 3269: 1988, Fasteners -Acceptance inspection. IS0 4042:-3 , Fasteners - Electroplated coatings. IS0 4759-l:-“, Tolerances for fasteners - Part I: Bolts, screws, studs and nuts - Product grades A, B and CT. IS0 6157-2: 1995, Fasteners - Surface discontinuities - Part 2: Nuts. IS0 8992:1986, Fasteners - General requirements for bolts, screws, studs and nuts. I) 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 -,-,- IS0 7040:1997(E) 0 IS0 3 Dimensions See figure 1 and table 1. Symbols and designations of dimensions are specified in IS0 225. I) Prevailing torque element, shape optional 2) p= 15”to30” 3) o= 90” to 120” Figure 1 Table 1 - Dimensions 4,6 1 5,75 1 6,75 1 8,75 4,O 1 5.00 1 6.00 1 8.00 5.88 1 668 1 868 1 11,63 2.9 1 4,4 1 4,9 1 6.44 Dimensions in millimetres Ml0 Ml2 (M14)” Ml6 M20 M24 M30 M36 I,5 1 I,75 1 2 1 2 1 2,5 1 3 1 3,5 1 4 1 IO,8 1 13 1 15,l 1 17,3 1 21,6 1 25,9 1 324 1 38,9 1 10.0 1 12 ( 14,0 1 16,0 1 20,O 1 24,0 1 30,O 1 36.0 1 1463 16,63 I I 19.64 1 22,49 1 27,7 1 33,25 1 42,75 1 51.11 1 17.77 1 20.03 1 23,36 1 26,75 1 32,95 1 39,55 1 50,85 1 60,79 1 II,9 1 14,9 1 17,0 1 19,l 1 22.8 1 27.1 1 32,6 1 38,9 1 11,2 1 14,2 1 15,9 1 17.8 1 20,7 1 25.0 1 30.1 1 36.4 1 8,04 1 IO,37 1 12,l 1 14.1 1 16.9 1 20,2 1 24,3 1 29,4 1 6.43 1 8,3 1 9,68 1 11,28 1 13,52 1 16,16 1 19.44 1 23.52 1 16.00 1 18.00 1 21.00 1 24,00 1 30,OO 1 36 1 46 1 55.0 1 1) The size in brackets should be avoided if possible. 2) P is the pitch of the thread. 3) Minimum thread height. 4) Minimum wrenching height. 15.73 17.73 20,67 23,67 29,16 35 45 53,8 2 -,-,- 0 IS0 IS0 7040:1997(E) 4 Requirements and reference International Standards See table 2. Table 2 - Requirements and reference International Standards Material General requirements Thread Mechanical and performance properties Tolerances Nut body Insert International Standard Tolerance International Standards Property class Style decisive for mechanical properties International Standard Product grade Steel For example, polyamid IS0 8992 6H IS0 261, IS0 965-2 5 8 IO style 1 style 1 style 1 IS0 2320 FordcM16:A Ford M16: B Finish International Standard IS0 4759-l As processed Requirements for electroplated coatings are covered in IS0 4042. 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. Acceptability For acceptance procedure, see IS0 3269. 5 Designation EXAMPLE A prevailing torque type hexagon nut, style 1, with non-metallic insert, thread Ml2 and property class 8 is designated as follows: Prevailing torque type hexagon nut IS0 7040 - Ml2 - 8 IS0 7040: 1997(E) Annex A (informative) Bibliography 17 1 IS0 4032: 1986, Hexagon nuts, sty/e I - Product grades A and 8. 0 IS0 4 IS0 7040: 1997(E) 0 IS0 ICS 21.060.20 Descriptors: fasteners, nuts (fasteners), self-locking nuts, hexagonal nuts, specifications, dimensions, designation. Price based on 4 pages -,-,-