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Drill and fasten in one step. The hex head gives a firm, high-torque grip with a nutdriver or socket, and the flange under the head spreads the load to prevent crushing thin metal.
Hex self drilling screws save time and effort by drilling and fastening in one step. The hex head provides a firm, high-torque grip with a nutdriver or socket, and a flange under the head spreads the load to prevent crushing thin metal.
Measurement note: Screw length is measured from under the flange, and head height includes the flange.
HEX HEAD
Firm, high-torque grip for nutdrivers and sockets, reducing cam-out during fast installation.
FLANGE & DRILL POINT
The flange spreads the load to prevent crushing thin metal, while the self-drilling point cuts without pre-drilling.
Corrosion-resistant coated options are tested to extreme standards, including 1,000 hours of salt spray resistance, for wet and outdoor environments.
Zinc-plated steel is a common choice for areas with occasional exposure to moisture, while black-zinc-plated steel adds a dark, finished look.
✓ One-step install
Drills and fastens in a single operation.
✓ High-torque hex head
Works with nutdriver or socket.
✓ Flange load spread
Prevents crushing thin metal.
✓ Corrosion options
Up to 1,000 h salt spray coating.
01 / THIN METAL
Fasten thin sheet metal without pre-drilling or crushing the material.
02 / ROOFING & CLADDING
Corrosion-resistant coated options for wet and outdoor environments.
03 / STEEL FRAMING
Secure brackets, fittings and lath to light steel framing.
04 / LIGHT CONSTRUCTION
Partitions, ceilings and metal building components.
05 / OUTDOOR STRUCTURES
1,000-hour salt spray coated options for wet exposure.
06 / GENERAL METAL BUILDING
General drilling and fastening jobs on thin steel sections.
| Material Type | Characteristics | Typical Finish |
|---|---|---|
| 10B21 Boron Steel | Cold heading boron steel; hardens well for self-drilling screws. | Zinc / dacromet |
| SS410 Stainless Steel | Martensitic stainless; hardenable with improved corrosion resistance. | Plain / passivated |
| Alloy Steel Option | Strongest drilling screw option with corrosion-resistant coating. | Corrosion-resistant coating |
Zinc-Plated Steel
Common choice for areas with occasional exposure to moisture.
Black Zinc
Dark finish withstands occasional moisture with a finished look.
Corrosion-Resistant Coating
Tested to extreme standards, including 1,000 hours salt spray resistance.
Dacromet / Geomet
Chromium-free flake coating for higher corrosion protection.
Plain / Oiled
Degreased and oiled only for stainless steel or indoor use.
Custom Coating
Special colours and coatings available on request.
Hex Head
Firm, high-torque grip with a nutdriver or socket.
Flange Under Head
Spreads the load to prevent crushing thin metal.
Self-Drilling Point
Drills and fastens in one step without a pilot hole.
Thread Design
Self-drilling thread for secure grip in thin steel sections.
Dimension note: Length is measured from under the flange. Head height includes the flange.
ST4.2 / ST4.8 / ST5.5 / ST6.310B21 / SS410Zinc / Dacromet1,000 h Salt Spray OptionHex Head DriveFlange Under Head
| Model | Thread Diameter | Note |
|---|---|---|
| ST4.2 | 4.2 mm | Standard stock |
| ST4.8 | 4.8 mm | Standard stock |
| ST5.5 | 5.5 mm | Standard stock |
| ST6.3 | 6.3 mm | Heavier gauge |
Other diameters and lengths are available on request. Length is measured from under the flange.
Kraft boxes
With inner partitions, thread protection and full labeling.
Bulk cartons
Five-layer corrugated, waterproof sealed and strapped.
Pallets / wooden cases
ISPM-15 heat treatment certification available.
Resealable polybags
For samples and low-volume orders.
VCI anti-rust packaging
For long-distance overseas shipment.
Custom OEM packaging
Labels, barcodes and packaging; MOQ may apply.
01 Raw Material Inspection
02 Wire Drawing
03 Cold Heading
04 Thread Rolling
05 Drill Point Forming
06 Heat Treatment
07 Surface Finishing
08 Hardness Inspection
09 Dimensional Inspection
10 Salt Spray Testing
11 Packaging & Labeling
12 Outgoing QC
Salt spray testing
Corrosion-resistant coating verified up to 1,000 hours per ASTM B117.
Hardness testing
Hardness verified after heat treatment for drill point performance.
Dimensional inspection
Head size, flange, thread pitch, point geometry and length per drawing.
Thread verification
GO/NO-GO gauges and sample drilling and drive tests.
Coating thickness
Magnetic or eddy-current measurement per coating specification.
Final verification
100% visual inspection, packaging check and traceability.
1. Do hex self-drilling screws need pre-drilling?
No. The self-drilling point drills and fastens in one step, saving time and effort.
2. Why is there a flange under the head?
The flange spreads the load over the material surface and prevents crushing thin metal.
3. How is screw length measured?
Length is measured from under the flange. Head height includes the flange.
4. What surface treatments are available?
Zinc-plated steel, black zinc, corrosion-resistant coating, and dacromet. Coated options are tested to 1,000 hours salt spray resistance.
5. What materials are available?
10B21 boron steel, SS410 stainless steel, and a corrosion-resistant coated alloy steel option.
6. What sizes are available?
Standard models are ST4.2, ST4.8, ST5.5, and ST6.3. Other diameters and lengths are available on request.
