After working as a machine for so many years, you must not know the meaning of the labels on the screws, right?
The performance grades of bolts for steel structure connection are divided into more than ten grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, the gr...
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