QC/T 618-2022Specifications for embedded plastic nuts (English PDF)

Foreword

This document was drafted, in accordance with GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents". This document replaces QC/T 618-2013 "Specifications for plastic expansion nut".

Compared with QC/T 618-2013, the main technical changes are as follows:

- DEFINE the plastic expansion nuts stipulated in the 2013 version of the standard as plastic expansion nuts used in normal temperature environments, ADD plastic expansion nuts in high temperature environments (see Chapter 1)

- ADD the requirements for prohibited substance (see 3.3)

- ADD the requirements on the pull-off force of plastic expansion nuts in high-temperature environments (see 3.7)

- ADD the heat resistance test requirements for plastic expansion nuts in high-temperature environments (see 4.1.2);

- ADD the pull-off force test requirements for plastic expansion nuts in high-temperature environments (see 4.4.1).

1 Scope

This document specifies the requirements, test methods, acceptance inspection, marking and packaging of automotive plastic expansion nuts.

This document is applicable to plastic expansion nuts, which are matched with plastic (nylon) self-tapping screws, including plastic expansion nuts used in normal temperature environment and high temperature environment.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.

GB/T 90.1-2002 Fasteners - Acceptance inspection

GB/T 90.2-2002 Fasteners - Marking and packaging

GB/T 30512 Requirements for prohibited substances on automobiles

QC/T 713 Tapping screws thread for plastic (nylon)

QC/T 29017 Automotive molded plastic parts without individual tolerance limit the size of the deviation

3 Terms and definitions

This document does not have terms and definitions, that need to be defined.

4 Requirements

4.1 The material is polyamide. PA66 is recommended. Other polyamide materials can also be selected, according to the functional requirements of the parts.

4.2 Plastic expansion nuts shall have no defects, such as discoloration, deformation, deterioration, cracks.