Phillips Countersunk Head Self‑Drilling Screw

High-performance fastener for steel sheets, aluminum panels, wood and composite materials. Features flush countersunk head and integrated drill tip, widely used for decoration engineering, sheet metal fixing, furniture 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: Phillips Countersunk 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

Countersunk head for flush and flat installation without protruding

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

Precision threads deliver firm clamping strength and neat fastening effect

Multiple finishes suit indoor & outdoor anti‑corrosion requirements

Installation Instructions

Step 1: Place the screw vertically on the surface, fasten with a matched Phillips bit.

Step 2: Drill directly without pre-drilling, with debris discharged via flutes.

Step 3: Continue tightening until the screw head is fully flush with the surface.

Step 4: Check for firm and flat fastening effect.

Installation Notes

1. Operate vertically to avoid screw deflection and surface damage.

2. Avoid over-tightening to prevent material crack and excessive sinking.

3. Use matched bits to prevent screw head slipping and damage.

Specification Standards

Item No.	Diameter	dk		Pitch	dp	No.
		max	min		max
HPS- 20001	ST3.5	6.8	6.4	1.3	2.8	2
HPS- 20002	ST4.2	8.1	7.7	1.4	3.6	2
HPS- 20003	ST4.8	9.5	9.14	1.6	4.1	2
HPS- 20004	ST5.5	10.8	10.37	1.8	4.8	3
HPS- 20004	ST6.3	12.4	11.97	1.8	5.8	3

Application

Suitable for steel sheets, aluminum panels, wood and composite boards. Ideal for light‑steel framing, ceiling decoration, sheet metal fixing, furniture assembly and flush outdoor fastening.

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