High strength bolts should be high hardness
Datetime:2016.11.21 From:HanDan HaoQiang Fastener Manufacturing Co.,Ltd
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High strength bolt is only a general term, generally more than 8.8 levels of bolts even high strength bolts, but high strength bolts have a lot of standards, the standard is not the same, the required hardness is not the same, some of the hardness requirements are more than HRC24, some hardness requirements are HRC18-22, DEF some requirements are more than HRC33.
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