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Grade 12.9 screws refer to ultra-high-strength screws made of SCM435 alloy steel with a small tensile strength of 1220 MPa and a hardness of 39-44 HRC. It is mainly used in the textile, hydraulic, injection, and machinery industries, and most of the manufacturers are Taiwan-funded enterprises.
It is the best choice for FPV drone.
Quantity may vary ±3pcs