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You’re assembling a small motor, fixing a toy, or putting together a piece of electronic equipment – and you need a screw that’s strong, reliable, and available in just the right size. These M1 to M4 round pan head machine screws are made from heat‑treated carbon steel with your choice of nickel, black zinc, white zinc, or rubber‑coated black zinc. The Phillips drive gives you a solid grip with a standard screwdriver. Available in thread diameters from M1 up to M4, with lengths from 2mm to 70mm (measured under the head). Fully threaded for maximum hold. Use them in machinery, automotive, construction, medical devices, household appliances, and countless DIY projects.
| Thread Diameter | Thread Pitch (mm) | Head Diameter (mm) | Head Thickness (mm) | Typical Length Range (mm, under head) * | Available Finishes |
|---|---|---|---|---|---|
| M1 | 0.25 | 1.8 | 0.6 |
2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 |
Nickel‑plated, Black zinc, White zinc, Black zinc with anti‑loosening rubber |
| M1.2 | 0.25 | 2.0 | 0.7 | ||
| M1.4 | 0.3 | 2.5 | 0.8 | ||
| M1.6 | 0.35 | 2.7 | 0.9 | ||
| M2 | 0.4 | 3.2 | 1.3 | ||
| M2.5 | 0.45 | 4.2 | 1.6 | ||
| M3 | 0.5 | 5.2 | 1.7 | ||
| M4 | 0.7 | 6.6 | 2.2 |
* Length measured from underside of head to tip (grip length). Fully threaded. Tolerance ±0.3mm. Select exact size, finish, and length from dropdown.
| Finish | Appearance | Corrosion Resistance | Best For |
|---|---|---|---|
| Nickel‑plated | Bright silver, slightly shiny | Good – indoor use, light moisture | Electronics, appliances, visible hardware |
| Black zinc | Matte black, low glare | Moderate – indoor use, light moisture | Industrial equipment, dark furniture, custom builds |
| White zinc | Silver‑grey, matte | Moderate – indoor use, general purpose | General manufacturing, automotive, construction |
| Black zinc + anti‑loosening rubber | Black with rubber patch | Good – rubber adds vibration resistance | High‑vibration applications, machinery, automotive |
1. How do I measure the length of a pan head screw?
For pan head 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 “M3 x 10mm” screw has a 10mm long threaded shaft under the head. Our listing follows this standard.
2. Are these screws fully threaded?
Yes – all M1 to M4 screws in this range (up to 70mm length) are fully threaded from under the head to the tip, giving you maximum grip even in shallow holes.
3. Will the finish rust? Can I use these screws outdoors?
Nickel and zinc coatings provide moderate corrosion resistance suitable for indoor and light outdoor use. For continuous outdoor or marine environments, we recommend stainless steel. However, for most workshop, furniture, and electronics applications, these plated carbon steel screws are perfectly adequate.
4. What’s the anti‑loosening rubber coating? When should I choose it?
The black zinc finish with a rubber patch (often called “NYLOK” or similar) adds friction between the threads, preventing the screw from vibrating loose. Choose this for machinery, automotive, or any high‑vibration environment where a standard screw might back out over time.
5. 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., M3 nut for M3 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.
6. What Phillips screwdriver size do I need for very small screws like M1?
For M1 to M1.6, use a #000 or #00 Phillips. For M2 to M2.5, a #0 works. For M3 and M4, a #1 is appropriate. Always use a driver that fits snugly to avoid cam‑out and head damage.
