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Cross recessed countersunk head self-drilling and self-tapping screws. The flat head embeds fully into the material surface for a clean finish, while the drill point cuts through metal and wood without pre-drilling.
Cross recessed countersunk head tapping screws, also known as flat head screws or countersunk screws, conform to the Chinese national standard GB/T846-1985 and adopt the ISO 7050:1983 international standard. They are widely used in power equipment, electronic machinery, household appliances, and construction engineering.
Design note: The screw head is flat or semi-countersunk with a cross recess on top, so the head can be fully embedded into the material surface and avoid protrusion.
SELF-DRILLING POINT
Screws can be driven directly into materials without pre-made threaded holes, reducing installation steps and saving assembly time.
SELF-TAPPING THREAD
The thread forms a stable locking connection in metal, wood, and plastic, and the roll-formed thread supports repeated disassembly.
Materials are mainly carbon steel and alloy steel. Carbon content in carbon steel is below 2%; alloy steel is classified into low, medium, and high grades, and some types use SUS304 stainless steel. Threads are produced by wire heading and thread rolling.
The flat countersunk head is aesthetically pleasing and suitable for industries with high appearance requirements, such as furniture manufacturing and interior decoration. Installation requires only a screwdriver or an electric screwdriver.
✓ No pre-drilling
Drill point cuts into metal and wood directly.
✓ Flat finish
Countersunk head embeds fully into the surface.
✓ Phillips drive
Cross recess slot per GB/T944.1.
✓ Thread standard
Self-tapping thread per GB5280.
01 / POWER EQUIPMENT
Control cabinets, distribution boxes, and electrical enclosures.
02 / ELECTRONIC MACHINERY
Instrument housings, panels, and electronic equipment assembly.
03 / HOUSEHOLD APPLIANCES
Refrigerators, washing machines, and small home appliances.
04 / CONSTRUCTION
Light steel framing, partitions, ceilings, and building fittings.
05 / FURNITURE
Cabinets, desks, shelves, and knock-down furniture joints.
06 / INTERIOR DECORATION
Wall panels, decorative boards, and trim where a flush finish matters.
| Material Type | Characteristics | Typical Finish |
|---|---|---|
| Carbon Steel | Carbon content below 2%; good strength for general fastening. | Zinc plating |
| Alloy Steel | Low, medium, or high alloy grades for higher strength requirements. | Zinc / custom coating |
| Stainless Steel SUS304 | Cr 18-20%, Ni 8-10.5%; corrosion resistant for humid or outdoor use. | Plain / passivated |
Zinc Plating
Standard finish; blue, white, yellow, or black passivation available.
Plain / Self-Colour
Degreased and oiled only; suitable for indoor applications.
Black Oxide
Matte appearance with mild corrosion resistance.
Dacromet / Geomet
Chromium-free flake coating for higher corrosion protection.
Phosphate & Oil
Improved drive torque consistency for production assembly.
Custom Finishes
Special colours, coatings, and baking processes on request.
Countersunk Flat Head
Flat or semi-countersunk head fully embeds into the material surface, avoiding protrusion.
Cross Recess Drive
Phillips slot per GB/T944.1; works with a screwdriver or electric screwdriver.
Self-Drilling Point
Cuts through thin metal and wood without a pre-drilled pilot hole.
Self-Tapping Thread
Forms threads in metal, wood, and plastic with a stable locking effect.
Installation note: The cross recess design provides stable torque transfer, the thread-forming action reduces damage to the material, and installation can be completed with conventional screwdrivers.
GB/T846-1985ISO 7050:1983GB/T944.1GB5280
| Model | Thread Diameter | Note |
|---|---|---|
| ST2.2 | 2.2 mm | Fine applications |
| ST2.9 | 2.9 mm | Electronics |
| ST3.5 | 3.5 mm | Appliances |
| 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 | Standard stock |
| ST9.5 | 9.5 mm | Heavy duty |
Full specification range covers ST2.2 to ST9.5. Standard stock models are ST4.2, ST4.8, ST5.5, and ST6.3; other diameters and lengths are available on request.
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 Dimensional Inspection
09 Mechanical Testing
10 Final Cleaning
11 Packaging & Labeling
12 Outgoing QC
Dimensional inspection
Head angle, head height, recess depth, thread pitch and drill point per drawing.
Thread verification
GO/NO-GO gauges and sample drive tests for thread-forming performance.
Mechanical testing
Hardness, torsional strength and drive-bit engagement checks.
Coating thickness
Magnetic or eddy-current measurement; salt spray per ASTM B117.
Material certificate
Chemical composition and heat/lot traceability on request.
Final verification
100% visual inspection, packaging check and traceability.
1. Can these screws be installed without pre-drilling?
Yes. The self-drilling point cuts through thin metal and wood, and the self-tapping thread forms its own threads, so no pilot hole is required.
2. What materials can they fasten?
Metal, wood, and plastic. They are used in power equipment, electronic machinery, household appliances, construction, furniture, and interior decoration.
3. Which standards do they conform to?
GB/T846-1985 and ISO 7050:1983 for the countersunk tapping screw, with Phillips slot per GB/T944.1 and self-tapping thread per GB5280.
4. What sizes are available?
The full range covers ST2.2 to ST9.5. Standard stock models are ST4.2, ST4.8, ST5.5, and ST6.3; other diameters and lengths are available on request.
5. Can the screws be removed and reused?
The roll-formed thread provides a stable locking effect and supports repeated disassembly for non-permanent joints.
6. What surface finishes are available?
Zinc plating is the standard finish. Plain, black oxide, Dacromet/Geomet, phosphate and oil, and custom finishes are available on request.
