🔩 Product Overview: M4 & M5 304 Stainless Steel Phillips Pan Head Screws
Need strong, rust‑proof screws for your outdoor furniture, marine project, or kitchen equipment? These M4 and M5 Phillips pan head machine screws are made from A2 (304) stainless steel – so they won't rust, stain, or weaken in humid or wet environments. The rounded pan head gives a clean, low‑profile finish that sits flush on surfaces, while the Phillips drive works with standard #2 bits for easy installation. Fully threaded from under the head to the tip, they grip tightly in thin materials and pair perfectly with matching nuts or tapped holes. Available in various lengths (measured under the head), these bolts are a reliable choice for appliances, electronics, automotive trim, and everyday DIY.
✨ Why Choose 304 Stainless Steel Pan Head Screws (M4/M5)
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A2 (304) stainless steel – Excellent corrosion and acid resistance. Perfect for outdoors, humid environments, and even coastal use (though 316 is better for direct saltwater immersion).
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Phillips pan head design – Rounded top with a flat bearing surface. Distributes clamping force evenly and gives a clean, professional finish.
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Fully threaded, coarse metric pitch – M4x0.7, M5x0.8. Threads run the entire shank length for maximum grip in thin materials and reliable engagement with nuts.
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Length measured under the head – No confusion: an M5 x 20mm screw has 20mm of threaded shank below the pan head.
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Versatile sizes M4 and M5 – Ideal for furniture assembly, appliance repair, machinery, and automotive trim.
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Made in China to consistent standards – Precision threads and smooth heads. Plain (unplated) finish – natural stainless silver.
📏 Technical Specifications – M4 & M5 Pan Head Phillips Screws (304 Stainless)
| Specification |
M4 |
M5 |
| Thread Diameter (d) |
4mm |
5mm |
| Thread Pitch (p) |
0.7mm |
0.8mm |
| Head Style |
Pan head / round head |
| Drive Style |
Phillips (PH2 recommended) |
| Material |
304 Stainless Steel (A2 grade) |
| Thread Type |
Fully threaded |
| Length Measurement |
Under head – see product options (typical range: 4–60mm) |
| Finish |
Plain / natural stainless (unplated) |
| Grade |
A2 (304) |
📊 Stainless Steel Comparison – Which Grade to Choose?
| Grade |
Corrosion Resistance |
Best Use |
| 201 Stainless (SUS) |
Poor – rusts with water |
Dry indoor environments only |
| 304 Stainless (A2) |
Good – resists corrosion & acid |
Outdoor, humid, general purpose (these screws) |
| 316 Stainless (A4) |
Excellent – with molybdenum for saltwater & chemicals |
Marine, coastal, high‑chloride areas |
❓ FAQs – M4/M5 Pan Head Screws (304 Stainless)
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the pan head. For example, an M5 x 20mm screw has a 20mm threaded shank below the head.
🔸 Will 304 stainless steel rust in outdoor or coastal environments?
304 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, 316 stainless (A4) is better, but for garden furniture, railings, and general outdoor DIY, 304 lasts for years without rust.
🔸 What Phillips screwdriver size works for M4 and M5?
M4 uses a PH1 or PH2 (PH1 is often best). M5 uses a PH2. A good quality PH2 bit will handle both comfortably. Using the correct size prevents stripping.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are machine screws – they require a matching metric nut (M4 or M5) or a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with 304 stainless nuts.
🔸 What lengths are available for M4 and M5?
Lengths vary – please select from the dropdown options on the product page. Typical ranges: M4 (4–50mm), M5 (6–60mm). All lengths are measured under the head.
🔸 Are these screws magnetic?
304 stainless is generally non‑magnetic in its annealed state, but cold forming (like thread rolling) can make it slightly magnetic. A light magnetic response is normal and does not affect corrosion resistance.
