Phillips Countersunk Head Self‑Drilling Screw

High‑performance fastener for steel plates, metal profiles, wood and composite materials. Features external hex drive and integrated drill tip, widely used for steel structures, brackets, equipment assembly and indoor‑outdoor building fastening.

Material: Carbon steel (1022), SUS410, SUS304 stainless steel

Specs: Dia. 3.5‑6.3 mm; Length 13‑100 mm

Head: External hex head

Thread: Standard / fine thread with drill flutes

Surface Finish: Black phosphate, bright zinc, blue‑white & yellow zinc; custom anti‑rust / salt‑spray available

Key Advantages

Hex head for non‑slip, high‑torque installation

Built‑in drill tip, no pre‑drilling; hardened tip penetrates metal reliably

Precision threads deliver firm clamping strength

Multiple finishes suit indoor & outdoor anti‑corrosion requirements

Installation Instructions

Position the self‑drilling screw perpendicular to the surface of the workpiece.
Apply axial pressure while driving the screw; the drill point of the fastener drills through the upper material to form a pilot hole.
Continue tightening, the screw taps threads into the base material.
Keep driving until the flange head sits firmly against the surface.

Important Requirement:

The length of drill point L₁ must be greater than the thickness of upper‑layer material L₂, to guarantee complete drilling before thread tapping.

Specification Standards

Item No.	Diameter	dc		Pitch	h	k		s
		max	min		min	max	min	max	min
HHS- 19001	ST3.5	8.3	7.6	1.3	0.6	3	3.0	5.5	5.32
HHS- 19002	ST3.9	8.3	7.6	1.3	0.6	3	3.0	5.5	5.32
HHS- 19003	ST4.2	8.8	8.10	1.4	0.8	4	3.6	7.0	6.78
HHS- 19004	ST4.8	10.5	9.80	1.6	0.9	4	3.8	8.0	7.80
HHS- 19005	ST5.5	11.0	10.00	1.8	1.0	5	4.8	8.0	7.78
HHS- 19006	ST6.3	13.5	12.20	1.8	1.0	6	5.3	10.0	9.78

Application

Suitable for steel sheets, aluminum panels, wood and composite boards. Ideal for light‑steel framing, ceilings, metal enclosures and outdoor fastening.

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