Aiming at six common mass production defects including cam-out, cracking, screw breaking, floating height, virtual locking and offset, this article analyzes the causes of process, equipment, bit and material problems, and provides practical improvement solutions for electronic factories.

Introduce major and pitch diameter tolerance of micro thread from M0.8 to M2.0, define gauge inspection rules and the negative influence of out-of-tolerance thread on assembly and cam-out.

Explain classified storage, anti-static packaging, moisture and rust prevention measures for precision mini screws, as well as inventory management, batch traceability and mixing prevention methods to improve warehouse efficiency.

Focus on mini screws for electronics and instruments, introduce metric micro size classification, material selection, head & drive types, as well as precision assembly, torque control and defect improvement solutions.

Compare salt spray life, appearance and cost of common plating for micro screws: white zinc, blue zinc, color zinc, nickel, black zinc.

State precision control standard of micro screws, introduce locking craft for slim electronic products to improve assembly yield.