ISO 10642:2019 ファスナー — 積載性が低下した六角穴付き皿ネジ | ページ 2

Foreword

ISO (the International 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 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 standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents ).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html .

This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners with metric external thread.

This third edition cancels and replaces the second edition (ISO 10642:2004), which has been technically revised. It also incorporates the Amendment ISO 10642:2004/Amd.1:2012. The main changes compared to the previous edition are as follows:

• the whole standard has been improved to clearly point out that these hexagon socket countersunk head screws have reduced loadability because of their head design (head dimensions and penetration of the hexagon socket);
• screws made of stainless steel have been added;
• detailed head configuration has been added (see Figure 4);
• M2 and M2,5 have been added; as their minimum ultimate tensile loads for full loadability are not specified in ISO 898-1 and ISO 3506-1, they have been calculated with the same formulae accordingly (see Annex A);
• the reference threaded length b has been increased to 3d for partially threaded screws M14 to M20, so that these screws can be tensile tested in accordance with ISO 3506-1 (b ≥ 3d is required to tensile test screws with reduced loadability);
• head height k_min has been added as reference dimension in Tables 1 and 2;
• wall thickness between driving feature and bearing face w_min has been replaced by the depth of the internal driving feature t_max (same method as for hexalobular internal drive);
• D_a, D_k and F are pointed out as gauge dimensions in Table 3 (see also Figure 5);
• the minimum nominal lengths of the standardized range have been determined in accordance with footnote g of Tables 1 and 2 and therefore the shorter lengths for M4 to M20 were deleted.

1 Scope

This document specifies the characteristics of hexagon socket countersunk head screws with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M2 to M20, and with product grade A.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography