Screw Core Classifications:
Machine Screws: Standard threads for pre-threaded holes. Fully or partially threaded shank, ideal for precision assembly.
Self-Tapping Screws: Drill, tap, push without pre-drilled holes. Types include:
Ordinary Self-Tapping Screws: For plastics, wood, thin metal.
Self-Drilling Screws: Drill tip penetrates steel, no pre-drilling, boosts efficiency.
Wood Screws: Deep threads, large pitch, sharp teeth for wood, strong lock.
Set Screws: Fix positions, prevent slippage or rotation. End shapes:
Tapered End: High lock force, for hard surfaces.
Flat End: Large contact, non-damaging.
Concave/Cylindrical End: For positioning or pressing into shaft holes.
Structural Screws: High-strength, heat-treated, replace bolts in steel structures, speed installation.