ISO 7434:2024 ファスナー — 円錐先付きすりわり付き止めねじ | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners with metric external thread, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 185, Fasteners, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 7434:1983), which has been technically revised.

The main changes are as follows:

• the values of d_t for cone point have been added in Table 1;
• for M1,6, l = 2 mm has been classified as too short length; the lengths for M2 (l = 3 mm), M3 (l = 4 mm), M3,5 (l = 5 mm), M4 (l = 5 mm) and M5 (l = 6 mm) have been classified separately as short standard lengths with l_nom calculated in order to get at least 2,5 full pitches; regular standard lengths have been calculated in order to get at least 4 full pitches up to M3,5 and 3 full pitches above M3,5;
• for stainless steel screws, grades A2 and A4 with hardness classes 12H and 21H have been added;
• non-ferrous metal screws have been deleted (as a consequence of the withdrawal of ISO 8839);
• mechanical properties of steel and stainless steel screws have been added for d < 1,6 mm (“As agreed”) in Table 3;
• for steel fasteners, “plain” has been changed to “as processed”, and non-electrolytically applied zinc flake coating has been added in Table 3;
• for stainless steel fasteners, “plain” has been changed to “Clean and bright”, and “Passivated” has been added in Table 3;
• the requirement of surface integrity has been added for steel screws in Table 3;
• specifications for marking and labelling have been added as Clause 6.

1 Scope

This document specifies the characteristics of slotted set screws with cone point, in steel and stainless steel, with metric coarse pitch threads M1,2 to M12, and with product grade A.

If in certain cases other specifications are requested, hardness classes and stainless steel grades can be selected from ISO 898-5 or ISO 3506-3, and dimensional options from ISO 888, ISO 965-1 or ISO 4753.

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 terminology databases for use in standardization at the following addresses:

Bibliography