Which is better, grade 12.9 screw or stainless steel screw?
Time:
2018-05-25
Look at the use of the environment,In the high-strength, high-impact environment, grade 12.9 is the top variety of screws, with high hardness and tensile strength, its Rockwell hardness (HRC) can reach 39-44, and the tensile strength can reach 1220N
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