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You’re assembling a 3D printer, mounting a part on a CNC machine, or building a piece of custom furniture – and you want a screw with a low profile head that won’t snag, plus the strength of a hex drive. These A2 stainless steel hex socket screws feature a flat round head (sometimes called a “pan head” with a flatter top) that provides a wide bearing surface while sitting closer to the material than a standard cap head. The hex socket (Allen) drive lets you apply high torque without slipping. Made from 304 stainless steel, they resist rust, heat, and oxidation. Available in M2 through M8 diameters, with lengths from 2mm to 90mm (measured under the head). Fully threaded for maximum grip. Ideal for electronics, machinery, marine hardware, and any project where a clean, low‑profile fastener with corrosion resistance is needed.
| Thread Diameter (M) | Thread Pitch (mm) | Typical Lengths (mm, under head) * | Head Style | Drive | Material |
|---|---|---|---|---|---|
| 📐 Length measured from underside of head to tip. Fully threaded. Select exact size from dropdown. | |||||
| M2 | 0.4 |
2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 |
Flat round head (low profile) |
Hex socket (Allen) |
A2 304 Stainless |
| M2.5 | 0.45 | ||||
| M3 | 0.5 | ||||
| M4 | 0.7 | ||||
| M5 | 0.8 | ||||
| M6 | 1.0 | ||||
| M8 | 1.25 | ||||
* Lengths are typical – exact availability may vary. Please allow minor manual measurement errors. Hex key sizes: M2→1.5mm, M2.5→2mm, M3→2.5mm, M4→3mm, M5→4mm, M6→5mm, M8→6mm approx.
| Property | Benefit |
|---|---|
| Corrosion resistance | Excellent in humid, outdoor, and light marine environments. Won’t rust like carbon steel. |
| Strength | High tensile strength (A2‑70 ~700 N/mm²). Durable and impact resistant. |
| Heat resistance | Good resistance to high temperatures – maintains strength in elevated environments. |
| Magnetic | Almost non‑magnetic (slightly magnetic after cold working – normal for 304). |
1. How do I measure the length of a flat round head screw?
For flat round head (pan style) screws, length is measured from the underside of the head (the flat bearing surface) to the tip. The head itself is NOT included. So an “M4 x 10mm” screw has a 10mm long threaded shaft under the head. This matches our listing.
2. Are these screws fully threaded?
Yes – all M2 to M8 screws in this range (up to 90mm length) are fully threaded from under the head to the tip, giving you maximum grip even in shallow holes.
3. What’s the difference between a flat round head and a standard socket cap head?
A flat round head has a much lower profile than a standard socket cap head. It’s wider and flatter, providing a larger bearing surface while reducing head height. This is ideal for applications with limited clearance or where a less obtrusive fastener is desired.
4. Can I use these screws outdoors? Will they rust?
A2 stainless (304) is highly corrosion‑resistant and suitable for outdoor use in most environments – including rain, humidity, and coastal areas. For continuous saltwater immersion, A4 (316) is better, but for furniture, machinery, and general outdoor hardware, 304 is excellent and will not rust.
5. What hex key size do I need for each screw?
Approximate matching: M2→1.5mm, M2.5→2mm, M3→2.5mm, M4→3mm, M5→4mm, M6→5mm, M8→6mm. Always use a quality hex key that fits snugly to avoid rounding the socket.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard metric nuts of the same thread size (e.g., M4 nut for M4 screw). They will also thread into pre‑tapped holes. They are not self‑tapping – for wood or plastic, drill a pilot hole and use a nut or threaded insert.
