INTERNATIONAL ISO STANDARD 10642

First edition 19974 1-15

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Reference number ISO 10642:1997(E) ISO 10642:1997( E)

Foreword

ISO (the International Organization for ) 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. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International Thisorganizations, preview is downloadedgovernmental from and www.sis.se. non- Buy the entire standard via https://www.sis.se/std-611344 governmental, in liaison with ISO, also take patt in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

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.

International Standard ISO 10642 was prepared by Technical Committee ISO/lC 2, Fasteners.

Annex A forms an integral patt of this International Standard.

0 ISO 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization

Case postale 56 l CH-121 1 Geneve 20 l Switzerland Pnternet central @iso.ch x.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland INTERNATIONAL STANDARD @ISO ISO 10642:1997(E)

Hexagon socket countersunk head screws

1 Scope

This International Standard specifies the characteristics of hexagon socket countersunk head screws with threads from M3 up to and including M20, of product grade A and propetty classes 8.8, 10.9 and 12.9.

NOTE - Particular attention is drawn to the note in table 2 and to table 3, concerning the limitation on ultimate tensile load.

Gauging of hexagon sockets is specifiedThis previewin annex isA. downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-611344

If, in special cases, specifications other than those listed in this International Standard are required, they should be selected from existing International Standards, for example ISO 261, ISO 888, ISO 898-1, ISO 965-2 and ISO 4759-1.

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 ISO maintain registers of currently valid International Standards.

ISO 225: 1983, Fasteners - Belts, screws, studs and nuts - Symbols and designations of dimensions.

ISO 261:-“, ISO generalpurpose metric threads - Genera/ plan.

ISO 888:1976, Belts, screws and studs - Nominal lengths, and thread lengths for general purpose bolts.

ISO 898-1:-2’, Mechanical properties of fasteners made of carbon steel and a//oy steel- Part 7: Belts, screws and studs.

ISO 965-2:-3’, ISO general purpose metric screw threads - Tolerantes - Part 2: Limits of sizes for general purpose holt and nut threads - Medium quality.

ISO 965-3:-4’, ISO general purpose metric screw threads - Tolerantes - Part 3: Deviations for constructional threads.

ISO 3269: 1988, Fasteners - Acceptance inspection.

ISO 4042:-5’, Fasteners - Electroplated coatings.

ISO 4759-1:-6’, Tolerantes for fasteners - Part 7: Belts, screws, studs and nuts - Product grades A, B and C.

ISO 6157-1: 1988, Fasteners - Surface discontinuites - Part 7: Belts, screws and studs for general requirements.

1) To be pub lished. (Revision of ISO 261:1973) 2) To be pub Iished. (Revision of ISO 898-1:1988) 3) To be pub lished. (Revision of ISO 965-2: 1980) 4) To be pub lished. (Revision of ISO 965-3: 1980) 5) To be pub lished. (Revision of ISO 4042: 1989) 6) To be pub Ilished. (Revision of ISO 4759-1: 1978) ISO10642:1997(E)

ISO 6157-3: 1988, Fasteners - Surface discontinuites - Part 3: Belts, screws and studs for special requirements.

ISO 8992:1986, Fasteners - Genera/ requirements for bolts, screws, studs and nuts.

3 Dimensions and gauging of head

3.1 Dimensions

See figure 1 and table 1.

Symbols and designations of Symbols are defined in ISO 225.

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Permissible alternative form of socket

NOTE - For broached sockets which are at the maxi- mum limit of size the overcut resuiting from drilling shall not exceed 20 % of the length of any flat of the socket.

1) A slight rounding or countersink at the mouth of the socket is permissible. 2) Point to be chamfered or, for sizes M4 and below “as rolled”. 3) Edge of the head to be truncated or rounded. 4) a = 90” to 92” 5) Incomplete thread u G 2P 6) d, applies if values of Zsminare specified.

Figure 1 - Hexagon socket countersunk head screws ISO 10642:1997(E)

3.2 Gauging of head

See figure 2.

Tolerantes in millimetres 0 9o”-0°30’

A iu’ k

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1) D = dktheormax (see table 1). 2) F is the flushness tolerante of the head (see table 1).

NOTE - The top surface of the screw shall be located between the gauge surfaces A and B.

Figure 2 - Flushness gauge This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-611344

Table 1 - Dimensions Dimensions in millimetres

1 Thread (d) l M3 I M4 / M5 I M6 I M8 I MIO I M12 1 (M14)” 1 M16 1 M20 1 l P2’ I 0,5 I 017 I 018 1 1 1 1,25 I 115 I 1,75 I 2 1 2 I 2,5 I I b ref. I 18 I 20 I 22 I 24 I 28 1 32 I 36 I 40 I 44 I 52 I I 4 max. I 313 I 414 I 5,5 I 66 I 8,54 I IO,62 I 13,5 I 15,5 I 17,5 I 22 I I 4 theor. max. I 6,72 l 836 ( 11,20 I 13,44 l 17,92 I 22,40 1 26,88 1 30,80 I 33,60 1 40,32 1 I actual min. I 534 I 7,53 I 9,43 I 11,34 1 15,24 1 19,22 1 23,12 [ 26,52 [ 29,Ol 1 36,05 1 4 max. 3,00 4,00 5,00 6,00 8,00 IO,00 12,00 14,00 16,00 20,oo min. 2,86 3,82 4,82 5,82 7,78 9,78 11,73 13,73 15,73 19,67

3) I e min. I 2,3 l 2,87 I 3,44 l 4,58 l 5,72 l 6,86 I 9,15 I 11,43 l 11,43 I 13,72 I 1 k max. I Im5 I 2,48 1 3,l I 3,72 I 436 1 62 1 7,44 1 8,4 1 8,8 ( IO,16 1I I F4’ max. I 0,25 I 0,25 0,3 0,35 0,4 04 0,45 03 W 0,75 I r min. I OJ I 02 l 02 I 0,25 I 04 I 0,4 I 016 I 016 1 016 1~~~ ~~018 1 s5) nom. 2 23 3 4 5 6 8 IO IO 12 max? 2,045 2,56 3,071 4,084 5,084 6,095 8,115 10,115 10,115 12,142 max.‘) 2,060 2,58 3,080 4,095 5,140 6,140 8,175 10,175 10,175 12,212 min. 2,020 2,52 3,020 4,020 5,020 6,020 8,025 10,025 10,025 12,032 I t min. I IJ I lt5 I 13 I 22 I 3 I 3,6 I 4,3 1 4,5 I 4,8 1 5,6 1 I W min. l 0,25 l 0,45 I 0,66 1 017 ) 1,16 l 1,62 I 118 l 1,62 1 22 1 22 I