QC/T 598-2022Projection weld bolts on the bearing face (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

This document replaces QC/T 598-1999 "Bolt with projection welding on the bearing face". Compared with QC/T 598-1999, the main technical changes are as follows:

- ADD fine thread specifications (see Table 1 and Table 2);

- MODIFY alpha, h, K, r values, matching hole diameter accuracy (see Table 1 and Table 2);

- MODIFY the requirements on thread tolerances (see Table 3);

- ADD the nominal values of d1, d2, d3, e, f, h, K (see Table 1 and Table 2);

- ADD the requirements for plate thickness dimensions (see Table 1 and Table 2);

- ADD the grade 8.8 mechanical performance grade of Type A and Type C projection weld bolts (see Table 3).

1 Scope

This document specifies the types, dimensions, and technical conditions of bearing face projection weld bolts for automobiles.

This document is applicable to projection welding bolts of three types of bearing face welding joints of type A and C, which have thread specifications of M4 ~ M12/M12 x 1.25, as well type B, which has specification of M5 ~ M10/M10 x 1.25.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 2 Fasteners - Ends of parts with external thread

GB/T 90.1-2002 Fasteners - Acceptance inspection

GB/T 90.2-2002 Fasteners - Marking and packaging

GB/T 196 General purpose metric screw threads - Basic dimensions

GB/T 197 General purpose metric screw threads - Tolerances

GB/T 3098.1-2010 Mechanical properties of fasteners - Bolts, screws and studs

GB/T 3103.1-2002 Essential oils and aromatic extracts - Determination of residual benzene content

GB/T 5779.1-2000 Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements

QC/T 326 Coding rules for automotive standardized parts

QC/T 625 Metallic coatings and conversion coatings for automobiles […]