GB/T 3098.7-2000 in English

《GB/T 3098.7-2000紧固件机械性能 自挤螺钉》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了表面淬硬并回火的自挤螺钉的技术要求。符合本标准的自挤螺钉能挤压出多种普通（内）螺纹，其螺纹公径直径为2～12mm，用于机电产品。GB/T 3098.1不适用于按本标准制造的螺钉。

1 Scope

This standard specifies the requirements for case hardened and tempered thread rolling screws ). Thread rolling screws according to this standard produce many types of female threads, in the range from 2mm up to and including 12mm nominal thread diameter, for use in general engineering applications.

GB/T 3098.1 is not applicable to screws made according to this standard.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication for this standard, all editions indicated are valid. All standards are subject to revision, and parties using this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

GB/T 197-1981 General Purpose Screw Threads - Tolerances and Fits for Diameter from 1 to 355mm
GB/T 709-1988 Dimensions, Shape, Weight and Tolerances for Hot-rolled Plates and Sheets
GB/T 3098.2-2000 Mechanical Properties of Fasteners - Nuts - Coarse Thread (idt ISO 898-2:1992)
GB/T 3098.17-2000 Mechanical Properties of Fasteners - Preloading Test for the Detection of Hydrogen Embrittlement - Parallel Bearing Surface Method (idt ISO 15330:1999)
GB/T 4340.1-1999 Metallic Materials - Vickers Hardness Test - Part 1: Test Method (eqv ISO 6507-1:1997)
GB/T 5267-1985 Electroplated Coatings on Threaded Fasteners
GB/T 6559-1986 Screw Thread Shanks for Thread Forming Screw - Metric Coarse Thread Series
ISO 10683:2000 Fasteners - Non-electrolytically Applied Zinc Flake Coatings

3 Materials

The thread rolling screws shall be made from cold heading, case hardening quality steel; the chemical composition given in Table 1 is given for guidance only.

Foreword I
ISO Foreword IV
1 Scope
2 Normative References
3 Materials
4 Mechanical Properties and Working Performance
5 Test Methods
6 Torque Wrenches
7 Marking