Machine screws are indispensable fasteners in modern industry and are widely used in the assembly and fixation of various equipment and structures. Common machine screws include pan head machine screws, countersunk machine screws, round head machine screws, hexagonal head machine screws, etc. The materials are generally carbon steel (1022, 10B21), stainless steel (SS304, SS316), etc. Common thread diameters include M1, M2.5, M3, M4, M5, M6, and M8, etc. The screw length ranges from 3mm to 100mm, and the surface treatment is galvanized, nickel-plated, and oxidized. Haina's machine screws are of various types and comprehensive specifications, which can meet the needs of different industrial fields, such as DIN7991, GB2672, GB70.1, ISO7380……