Numbering rules for auto standard screws

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This standard is an amendment to the enterprise standard Q/FT b014-2000 "Standard Part Numbering and Selection Rules for Vehicles and Agricultural Equipment". The main differences between this standard and Q/FT b014-2000:

Amend the standard name to "Automobile Product Standard Part Number and Selection Rules";

1. The scope of application of this standard is adjusted according to the standard parts used by the company's automotive products;

2. Make adjustments to a pair of standards in Appendix A;

3. Annex B of the original standard was cancelled;

4. The standard format is standardized in accordance with the requirements of GB/T 1.1.

Automobile standard parts—generally based on existing mature national standards or automobile industry standards. Some supporting standards are standard parts. For example, automobile standard parts Q140 are included in the standard GB/T 9074.14-1998, and GB/T 9074.14-1998 has been Replaced by GB/T 9074.1-2002. Since the standards on which the automotive standard parts are based have not been adjusted, the standards remain unchanged.

Due to the revision of standard parts, when the size, accuracy, performance or material of the standard parts change and affect the interchangeability of the standard parts, although the structure types of the standard parts are basically the same, the "change code" should be given. Different thread series of the same variety, non-derivative and interchangeability of the same variety are also distinguished by code changes. The change code is represented by a 1-digit capital letter, starting with the letter "B" (not "I", "0", "Q", "2").

The automobile industry has adopted the product variety code and change code in QC/T 326-1999 to make clear regulations, which can be used according to regulations and cannot be given at will. The variety code and the change code constitute the product code of a certain product. The product code is clearly stipulated in QC/T 326-1999 and can be used according to regulations and cannot be given at will.

The serial number of automobile standard parts is composed of 9 parts in order, including standard part feature code, variety code, replacement code, size code, distribution point code, special subordinate code of assembly, mechanical property material code, surface treatment code and classification code .