Csk phillips head self tapping screw

High-performance fastener for steel sheets, aluminum panels, plastic and composite materials.

Features flush countersunk head and sharp tapping thread, widely used for decoration, sheet metal connection and indoor assembly fastening.

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

Specs: Dia. 2.2‑6.0 mm; Length 6‑100 mm

Head: Csk Phillips head

Thread: Standard self-tapping thread

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

Key Advantages

Countersunk head for flush, non-protruding and neat installation

Sharp thread enables direct tapping without pre-processing

Precision threads deliver firm clamping and stable fastening

Multiple finishes provide reliable corrosion resistance for indoor use

Installation Instructions

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

Step 2: Tap directly without pre-drilling, cutting threads into the base material smoothly.

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	a	k	No.	M	t
		max	min		max				max	min
HCS- 21001	ST2.5	5.5	5.2	1.1	1.1	2	1	3.0	1.7	1.40
HCS- 21002	ST3	5.5	5.2	1.1	1.1	2	1	3.0	1.7	1.40
HCS- 21003	ST3.5	6.8	6.44	1.3	1.3	2	2	4.2	2.1	1.62
HCS- 21004	ST3.9	7.5	7.14	1.3	1.3	2	2	4.6	2.5	2.03
HCS- 21005	ST4	7.5	7.14	1.3	1.3	2	2	4.6	2.5	2.03
HCS- 21006	ST4.2	8.1	7.74	1.4	1.4	3	2	4.7	2.6	2.11
HCS- 21003	ST4.8	9.5	9.14	1.6	1.6	3	2	5.1	3.1	2.59
HCS- 21004	ST5.5	9.5	9.14	1.6	1.6	3	2	5.1	3.1	2.59
HCS- 21005	ST6	10.8	10.37	1.8	1.8	3	3	6.8	3.5	2.95
HCS- 21006	ST6.3	12.4	11.97	1.8	1.8	4	3	7.1	3.9	3.33

Application

Suitable for steel sheets, aluminum panels, plastic, wood and composite boards. Ideal for interior decoration, sheet metal connection, furniture assembly, electrical fixtures and flat surface fastening.

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