Screw Core Classifications:
Machine Screws: Standard threads for pre-threaded holes. Fully or partially threaded shanks, ideal for precision assembly.
Self-Tapping Screws: Drill, tap, and push sans pre-drilled holes. Types include:
Ordinary Self-Tapping Screws: For plastics, wood, thin metal sheets.
Self-Drilling Self-Tapping Screws: Drill tip penetrates steel, no pre-drilling, enhancing efficiency.
Wood Screws: Deep threads, large pitch, sharp teeth for wood, offer strong locking force.
Set Screws: Fix positions, prevent slip or rotation. End shapes vary:
Tapered End: High locking force for hard surfaces.
Flat End: Large contact area, non-damaging.
Concave/Cylindrical End: For positioning or pressing into shaft holes.
Structural screws: High-strength, heat-treated, replace bolts in steel structures, speeding installation.