QC/T 599-2022Overhead projection weld bolts (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 599-2013 "Overhead projection weld bolts". Compared with QC/T 599-2013, the main technical changes are as follows:

- MODIFY the dimensions alpha, k, r, r1 values of type A overhead projection weld bolts (see Table 1);

- MODIFY the dimensionsalpha and r of type B overhead projection weld bolts (see Table 2)

- ADD the nominal values of size d1, d3, k, h of type A overhead projection weld bolts and of d1, e, f, h of type B overhead projection weld bolts (see Table 1 and Table 2);

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

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

- CANCEL the special requirements on mechanical properties, changing it into the provisions in GB/T 3098.1-2010 (see Table 3).

1 Scope

This document specifies the types, dimensions, and technical conditions of overhead projection weld bolts.

This document is applicable to the type A overhead projection weld bolts and type B overhead projection weld bolts for automobiles, which have a thread specification of M4 ~ M12/M12 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 […]