QC/T 340-2017Hexagon bolts with serrated flange for automobiles (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Directives for standardization - Part 1. Structure and drafting of standards". This Standard replaces QC/T 340-1999 "Hexagon flange bearing toothed bolt".

Compared with QC/T 340-1999, the main technical changes in this Standard are as follows.

- added bolt diameter specification;

- adjusted thread length specification;

- modified partial technical requirements.

1 Scope

This Standard specifies hexagon bolts with serrated flange for automobile of which thread specifications are M6 ~ M20, M8×1 ~ M20×1.5 and M10×1.25 ~ M20×2, performance level is 8.8, 10.9, product level is A and B.

2 Normative references

The following referenced documents are indispensable for the application 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.

GB/T 2, Fastener - End of external threaded part

GB/T 90.1, Fasteners - Acceptance inspection

GB/T 90.2, Fasteners - Marking and packaging

GB/T 193, Ordinary thread - Diameter and pitch series

GB/T 3098.1, Mechanical Properties of Fasteners - Bolts, Screws and Studs

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

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

GB/T 9145, General purpose metric screw threads - Limits of sizes for the screw threads of medium quality and preferable plan

QC/T 326, Automotive standard parts product numbering rules

QC/T 625, Metallic coatings and conversion coatings for automobiles

3 Type and size

The type and size of hexagon bolts with serrated flange for automobile shall comply with Figure 1 and Table 1. […]