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Long-term use will inevitably absorb a large amount of dust and rust on it, so cleaning is very important, but do you know what will happen if the Square Bolt is not cleaned properly?
Pollution during... moreLong-term use will inevitably absorb a large amount of dust and rust on it, so cleaning is very important, but do you know what will happen if the Square Bolt is not cleaned properly?
Pollution during rinsing
After quenching, the fastener was clea...