ISO 2702:2022 ファスナー — 熱処理されたタッピングねじ — 機械的および物理的特性 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 13, Fasteners with non-metric thread,in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 185, Threaded and nonthreaded mechanical fasteners and accessories,in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 2702:2011), which has been technically revised.

The main changes are as follows:

• document newly structured with regard to requirements and test methods;
• new Table 1 for mechanical and physical properties and related test methods (see 5.1);
• maximum case-hardened depth increased to 0,12 mm for ST2,2 and ST2,6 (see 5.3);
• maximum core hardness changed from 370 HV back to 390 HV and core hardness test specified more precisely (see 5.4 and 6.4);
• new clauses for ductility and ductility test added (see 5.8 and 6.8);
• test method for case‑hardened depth determination modified (see 6.3);
• torsional test specified more precisely (see 6.7);
• new Clause 7 for inspection added;
• new Clause 8 for marking and labelling added.

1 Scope

This document specifies the mechanical and physical properties of heat treated tapping screws made of steel, with thread sizes ST2,2 to ST9,5 in accordance with ISO 1478, when tested at the ambient temperature range of 10 °C to 35 °C, and the related test methods.

Tapping screws are designed to form mating threads in sheet metals, without their own threads being deformed. Tapping screws are not intended to be pretensioned by design, even though they can experience varying degrees of low-level tensile stress after installation.

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 following terms and definitions apply.

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

Bibliography