🔩 Round Pan Head Phillips Machine Screws – 316 Stainless Steel, Marine Grade (M2–M8, Fully Threaded)
You’re bolting down deck fittings, repairing outdoor furniture, or assembling equipment in a coastal environment – and 304 stainless just isn’t enough. These round pan head machine screws are made from 316 stainless steel, which contains molybdenum for superior resistance to saltwater, chlorides, and industrial chemicals. The low‑profile pan head provides a wide bearing surface, perfect for plastic, wood, and thin metal. The Phillips drive works with standard crosshead screwdrivers. Available in M2, M2.5, M3, M4, M5, M6, and M8 diameters, with lengths measured under the head (excluding the head). Fully threaded for maximum grip. Ideal for marine hardware, chemical plants, outdoor furniture, and any harsh environment where corrosion is a constant battle.
✨ Key Features – 316 Stainless Pan Head Phillips Screws
- 🔘 Round pan head design – Low profile, wide bearing surface. No countersinking needed – clean, neat appearance.
- 🛡️ 316 stainless steel (marine grade) – Contains molybdenum for exceptional saltwater and chloride resistance. Outperforms 304 in harsh environments.
- ⚙️
Phillips drive – Standard cross recess works with common screwdrivers. Good torque transfer.
- 📏 Metric sizes M2, M2.5, M3, M4, M5, M6, M8 – Covers miniature electronics to medium machinery and marine hardware.
- 📐 Lengths measured under head (excluding head) – Example: M4 x 10mm means thread diameter 4mm, length from under head to tip is 10mm. Fully threaded.
- ✨ Natural stainless finish – Bright silver appearance, no added coatings. Consistent and professional.
- ⚙️ GB/T818 standard – Precision dimensions, smooth threads, burr‑free.
📏 Specifications – M2 to M8 Round Pan Head Screws (316 Stainless)
| 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 |
4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50
(exact availability varies) |
Round pan head |
Phillips |
316 Stainless Steel (Marine Grade) |
| 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 1‑3mm manual measurement errors. Not all lengths shown; select your required size from the dropdown.
📋 316 vs. 304 Stainless Steel – Why Choose Marine Grade?
| Property |
316 Stainless (A4) |
304 Stainless (A2) |
| Corrosion resistance |
Excellent – resists saltwater, chlorides, acids (contains 2‑3% molybdenum) |
Good – not recommended for continuous saltwater exposure |
| Typical applications |
Marine hardware, chemical plants, coastal construction, food processing |
General outdoor, furniture, automotive trim, light marine |
| Strength |
Similar to 304 – A4‑70 grade (~700 MPa) |
A2‑70 grade (~700 MPa) |
| Cost |
Higher – premium marine grade |
Lower – general purpose |
❓ Frequently Asked Questions – 316 Stainless Pan Head Screws
1. How do I measure the length of a round 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 “M4 x 10mm” screw has a 10mm long threaded shaft under the head. All our lengths follow this standard.
2. Are these screws fully threaded? What about longer lengths like 50mm?
Yes – all screws in this range (M2 to M8, up to 50mm) are fully threaded from under the head to the tip, giving you maximum grip in blind holes or through‑nut applications.
3. Can I use these screws in saltwater? Are they truly marine grade?
Absolutely. 316 stainless is the standard for marine applications – boat hardware, dock fittings, underwater equipment, and coastal structures. It resists pitting and crevice corrosion far better than 304.
4. What Phillips screwdriver size do I need for M2–M8?
For M2–M2.5: #000 or #00; M3–M4: #0 or #1; M5–M6: #2; M8: #2 or #3. Always use a driver that fits snugly to avoid cam‑out and head damage.
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., M4 nut for M4 screw). For marine environments, pair with 316 stainless nuts.
6. Do you offer other sizes like M10 or M12?
This listing covers M2 to M8. We also carry larger sizes in 316 stainless – please check our store or contact us for custom orders.
