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When a project demands a flush, snag-free finish — whether you’re fastening wood panels, securing metal components, or assembling equipment — a countersunk head screw is the right choice. This range covers six thread diameters from M3.5 to M6.3, each available in multiple lengths, so you can match the exact fastener to your application.
Every screw is machined from 410 stainless steel, a high-hardness martensitic alloy that outperforms standard stainless in torque resistance and corrosion resistance. The Phillips drive is compatible with any standard power drill, and the self-drilling tip eliminates the need for a pilot hole in most applications. Each size is sold in a 50-piece pack for consistent, project-ready quantities.
From furniture assembly and equipment repair to metal panel fastening and heavy-duty DIY fabrication, these countersunk self-drilling screws deliver a clean, flush hold that holds up in both indoor and outdoor environments.
| Thread Diameter | Available Lengths | Pack Size |
|---|---|---|
| M3.5 | 13 / 16 / 19 / 25 / 32 / 38 mm | 50 pcs |
| M3.9 | 13 / 16 / 19 / 25 / 32 mm | 50 pcs |
| M4.2 | 13 / 16 / 19 / 25 / 32 / 38 / 50 / 60 mm | 50 pcs |
| M4.8 | 13 / 16 / 19 / 25 / 32 / 38 / 50 / 63 / 75 mm | 50 pcs |
| M5.5 | 19 / 25 / 32 / 38 / 50 / 63 / 75 mm | 50 pcs |
| M6.3 | 19 / 25 / 32 / 38 / 50 mm | 50 pcs |
Assemble wood furniture, secure shelving, and fasten panels with a flush countersunk finish that leaves surfaces smooth and snag-free — no visible screw head above the surface.
Select the exact diameter and length for each job from six thread sizes and up to nine lengths per diameter — without carrying multiple product lines on site.
Fasten metal panels, secure enclosures, and perform mechanical maintenance with corrosion-resistant 410 stainless steel fasteners that hold up in demanding environments.
| Thread Diameters | M3.5 / M3.9 / M4.2 / M4.8 / M5.5 / M6.3 |
|---|---|
| Length Range | 13 mm – 75 mm (varies by diameter) |
| Head Style | Countersunk (Flat) Head |
| Drive Style | Phillips |
| Point Type | Self-Drilling (TEK) |
| Thread Type | Coarse, Full Thread |
| Material | 410 Stainless Steel |
| Finish | Natural Stainless |
| Pack Size | 50 pieces per size combination |
| Application | Wood, sheet metal, aluminum, DIY & industrial — indoor & outdoor |
No. The self-drilling tip is designed to bore through wood and light-gauge metal without a pre-drilled pilot hole in most applications. For harder metals or thicker gauges, a small pilot hole may improve installation quality.
The thread diameter determines the screw’s holding strength and the size of the hole it creates. Smaller diameters (M3.5, M3.9) are suited for lighter-gauge materials and tighter clearances. Larger diameters (M5.5, M6.3) provide greater holding strength in denser or thicker substrates. Select the diameter based on your material thickness and load requirements.
410 stainless steel is a martensitic alloy with higher hardness and torque resistance than the more common 304 stainless steel. This makes it better suited for self-drilling applications where the screw must cut its own thread without deforming. It also offers good corrosion resistance in most environments.
A countersunk (flat) head is designed to sit flush with or below the surface of the material when fully driven. This eliminates any protrusion above the surface, reducing snag points and providing a clean, professional finish — particularly important for visible surfaces, furniture, and applications where a raised head would interfere with other components.
Yes. 410 stainless steel provides good corrosion and rust resistance for outdoor applications in typical environments including high-humidity and temperature-variable conditions. For highly corrosive marine or coastal environments, 316 stainless steel is generally recommended for long-term exposure.
A standard Phillips #2 bit fits most sizes in this range. For larger diameters (M5.5, M6.3), a Phillips #3 bit may be required. A power drill or cordless screwdriver set to moderate torque is recommended to avoid stripping the head.
As a general guideline, the screw length should be approximately 2–3 times the thickness of the material being fastened. For example, fastening a 6 mm panel typically calls for a 13–19 mm screw. Contact us if you need help selecting the right size for your specific application.
