ISO 965-4:2021 ISO汎用メトリックねじ山—公差—パート4：亜鉛メッキ後に公差位置HまたはGでタップされた内ねじと噛み合うホットディップ亜鉛メッキ外ねじのサイズの制限 | ページ 2

Foreword

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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 ).

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This document was prepared by Technical Committee ISO/TC 1, Screw threads.

This second edition cancels and replaces the first edition (ISO 965-4:1998), which has been technically revised.

The main changes compared to the previous edition are as follows:

• Clause 1, the third paragraph, including the formula for the fundamental deviation az, has been deleted;
• the tolerance classes 6AZ and 6AX, internal threads, have been replaced with the tolerance class 6az, external threads (NOTE of Clause 1 in ISO 965-4:1998; first paragraph of Clause 4 in ISO 965-4:2021);
• Table 1, the deviation values for the minor diameter of external threads, stress calculation, have been deleted, and M8 is added;
• the phrase “basic profiles” has been replaced by “basic profile and fundamental deviation” (fourth paragraph of Clause 6 in ISO 965-4:1998; fifth paragraph of Clause 7 in ISO 965-4:2021);
• Table 2, the maximum values for the minor diameter of external threads, stress calculation, have been deleted, and M8 is added.
• an informative annex is added for the external screw thread minor diameter, d₃, used by ISO/TC 2 to calculate the nominal stress area, A_s,nom.

A list of all parts in the ISO 965 series can be found on the ISO website.

1 Scope

This document specifies limit deviations and limits of sizes for the pitch and crest diameters of the hot-dip galvanized metric external screw threads conforming to the coarse thread series of ISO 262 (from M8 to M64) having a basic profile according to ISO 68-1.

This document is applicable to the hot-dip galvanized metric external screw threads to mate with the internal screw threads tapped with tolerance position H or G after galvanizing.

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

For the purposes of this document, the terms and definitions given in ISO 5408 apply.

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

Bibliography