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1. Scope of application

This standard specifies the type, size and technical conditions of welded hexagon nuts.

This standard is applicable to welded hexagon nuts with thread specifications of M4 ~ M16 and M8x1 ~ M16x1.5 and used in conjunction with bolts with mechanical properties below Grade 8.8.

2. Background and purpose of preparation

The welding hexagon nuts specified in this standard are standard parts used on the body parts of commercial vehicles and passenger cars.

In order to solve the problems of thread deformation and insufficient welding strength after welding of welded square nuts currently used in the automobile industry, the basic sub-standard committee of the standardization technical committee of the automobile industry proposed to formulate the standard of "welded square nuts" in the automobile industry.

This standard is modified to adopt the DIN929-2000 Welded Square Nut. Different and why:

The compilation format did not adopt DIN 928-2000, but adopted the Chinese standard GB/T1. 1-2009 "Standardization Work Guidelines Part I: Standard Structure and Compilation.

The size code is in accordance with the Chinese standard GB/T 5276-1985 "Fastener Bolt, Screw Stud and Nut Size Code and Marking".

There is no specification for 7/16 inch threads that use car seat belt anchorages. Because the automotive industry already has separate car seat belt anchorage nuts. should not be repeated in this standard.

Because our standard is used to not specify the weight in the standard text, but given in other documents, this standard does not use the weight of the product.

Eliminate the welding of square nuts in the mechanical drawing of the drawing method. Because of our country and Germany's mechanical drawing method is different.

Inspection and acceptance, marking and packaging shall be in accordance with China's standards. It is different from the German system.

Numbering rules according to automotive industry standards.

The drafting rules for the preparation of this standard conform to the provisions of GB/T 1.1..

The welding square nuts specified in this standard are applicable to small batch manual welding. Welding without the use of positioning pins, high welding strength, the thread is not easy to deform.

This standard is formulated according to the arrangement of 2009-1053-QC "The Ministry of Industry and Information Technology issued the first batch of industrial industry standard formulation and revision plan in 2009.