There are various quality 12.9 grade hexagonal bolts in the Chinese market, some of which can meet the standards, but some cannot. Many customers do not have inspection equipment, so they cannot confirm which quality is qualified. Here is an introduction to the selection of raw materials for grade 12.9 hexagonal bolts.
It is very necessary to remind that 40Cr will definitely not meet the physical and mechanical requirements of real 12.9.
Our factory has 21 years production experience, we pay high attention on quality, we never produce fake grades for any customers.
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