black grey phosphate bugle head self tapping drywall screw for metal wood

Self Drilling Screws are fasteners with built-in drilling capabilities, designed with a drill bit shaped tip that can directly penetrate materials such as metal, wood, and plastic without the need for pre drilling. Rapid fixation is achieved through the interlocking of threads and substrates, which is widely used in fields such as construction, furniture, and mechanical manufacturing. It has the characteristics of high efficiency, time saving, and high strength.

Technical Parameters and Selection Guide

Material: Carbon steel (surface galvanized/phosphated), stainless steel (304/316, corrosion-resistant)

Common specifications for diameter (mm): Φ 2.5, Φ 3.5, Φ 4.2, Φ 5.0 (depending on the thickness of the substrate, metal sheets are mostly used with a diameter of Φ 3.5-4.2)

Length (mm) 10-150mm (ensuring a minimum bite depth of 3-5mm after penetrating the substrate)

Thread type: single thread (high tensile strength), double thread (quick entry)

Head type: countersunk (flat installation), disc head (high pressure), hexagonal head (strong tool adaptability)

Surface treatment: white zinc plating (basic rust prevention), phosphating black (wear-resistant), Dacromet (high corrosion resistance)