Screw Core Classifications:
Machine Screws: Standard mechanical threads (metric, imperial) for threaded holes. Shank can be fully or partially threaded, ideal for precision.
Self-Tapping Screws: Drill, tap, push without holes. Subcategories include:
Ordinary Self-Tapping Screws: For plastics, wood, thin metal sheets.
Self-Drilling Self-Tapping Screws: Drill tip for steel plates, no pre-drilling, boosting efficiency.
Wood Screws: Deep threads, large pitch, sharp teeth for wood, strong locking force.
Set Screws: Fix part positions, prevent slippage or rotation. Various end shapes:
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.
