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