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When a standard Phillips or slotted screw can’t handle the torque, these hex socket cap head self-tapping screws step up. Cut from genuine A2 / SUS304 stainless steel, they give you the superb corrosion resistance that outdoor equipment, marine hardware, and food‑grade machinery demand – without a surface coating that can wear away. The internal hex drive lets you apply significantly more tightening force than a Phillips drive, and the deep socket cap head keeps the bit rock‑solid to virtually eliminate cam‑out, even in tight overhead or blind access spots. The coarse self‑tapping thread bites cleanly into sheet metal, wood, plastics, and aluminum, forming its own mating thread as you drive. No pre‑tap, no nut – just a drilled or punched hole. Covering the full practical range from M2 to M6 and lengths from 6 mm up to 50 mm, this series gives you one dependable, all‑stainless fastening platform for precision electronics, machinery brackets, furniture, and outdoor structural work.
| Thread Spec. | Thread Diameter | Typical Lengths (mm)* | Head Style | Drive | Material & Finish |
|---|---|---|---|---|---|
| M2 | 2.0 mm | 6, 8, 10, 12, 14 | Socket Cap | Hex (Allen) 1.5 mm | A2 / 304 Stainless, Natural |
| M2.5 | 2.5 mm | 6, 8, 10, 12, 14, 16 | Socket Cap | Hex (Allen) 2 mm | A2 / 304 Stainless, Natural |
| M3 | 3.0 mm | 6, 8, 10, 12, 14, 16, 20, 25 | Socket Cap | Hex (Allen) 2 mm | A2 / 304 Stainless, Natural |
| M3.5 | 3.5 mm | 8, 10, 12, 14, 16, 20, 25, 30 | Socket Cap | Hex (Allen) 2.5 mm | A2 / 304 Stainless, Natural |
| M4 | 4.0 mm | 10, 12, 14, 16, 20, 25, 30, 35, 40 | Socket Cap | Hex (Allen) 2.5 mm | A2 / 304 Stainless, Natural |
| M5 | 5.0 mm | 12, 14, 16, 20, 25, 30, 35, 40, 50 | Socket Cap | Hex (Allen) 3 mm | A2 / 304 Stainless, Natural |
| M6 | 6.0 mm | 16, 20, 25, 30, 35, 40, 50 | Socket Cap | Hex (Allen) 4 mm | A2 / 304 Stainless, Natural |
* Length is measured from under the head (thread length only). Hex key sizes are indicated for reference. Select your exact diameter and length from the product options.
Yes, for the best results. These are self‑tapping, not self‑drilling, so a pre‑drilled or pre‑punched hole is required. In thin sheet metal or soft plastic, a hole slightly smaller than the thread diameter works well. The screw will then cut or form its own mating thread as it’s driven in.
It depends on the screw diameter: M2 uses a 1.5 mm key, M2.5 and M3 use 2 mm, M3.5 and M4 use 2.5 mm, M5 uses 3 mm, and M6 uses a 4 mm hex key. A standard metric hex key set will cover all sizes.
They work very well in wood, plastic, and composite materials, too. The coarse thread bites aggressively. In hardwoods, a small pilot hole is recommended to reduce driving torque and prevent snapping, especially in the smaller M2–M3 sizes.
A2 / 304 stainless is highly resistant to corrosion from fresh water, humidity, and mild chemicals. It will not develop the red rust that carbon steel does. For continuous saltwater immersion, marine‑grade 316 (A4) offers even better pitting resistance, but for outdoor, automotive, and marine‑above‑water applications, A2 is the industry standard.
No. All listed lengths are the thread length only (measured from directly under the head to the tip). The head height adds a small additional amount, so you can accurately match the screw length to your material thickness.
