🔩 Product Overview: M4 & M5 Phillips Pan Head Machine Screws – 304 Stainless Steel (Fully Threaded)
Need strong, rust‑proof screws for your next furniture build, appliance repair, or outdoor project? These M4 and M5 Phillips pan head machine screws are made from 304 stainless steel – so they won't rust, stain, or weaken over time. 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 machinery, marine hardware, electronics enclosures, and everyday DIY.
✨ Why Choose 304 Stainless Pan Head Screws (M4/M5)
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304 stainless steel (A2 grade) – Excellent corrosion resistance for indoor and outdoor use. Won't rust in humid or wet environments – perfect for kitchens, bathrooms, and marine areas.
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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 – Threads run the entire shank length. M4x0.7 and M5x0.8 coarse pitch 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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Grade 4.8 strength – Strong enough for most general fastening applications, from furniture assembly to light machinery.
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Made in China to consistent standards – Precision threads and smooth head surfaces for easy installation.
📏 Technical Specifications – M4 & M5 Phillips Pan Head Screws (304 Stainless)
| Specification |
M4 |
M5 |
| Thread Diameter (d) |
4mm |
5mm |
| Thread Pitch (p) |
0.7mm |
0.8mm |
| Head Diameter (dk) |
6.6mm |
8.5mm |
| Head Thickness (k) |
2.2mm |
3.2mm |
| Drive Style |
Phillips (PH2 recommended) |
| Material |
304 Stainless Steel (A2 grade) |
| Finish |
Natural stainless (silver, unplated) |
| Thread Type |
Fully threaded |
| Length Measurement |
Under head – see product options (typical range: 4–60mm) |
| Grade |
Grade 4.8 |
❓ 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. However, in coastal areas with high salt spray or direct saltwater immersion, 316 stainless (A4) is recommended. For general outdoor furniture, garden equipment, and covered marine applications, 304 performs very well.
🔸 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.
