🌊 Product Overview: M5 Phillips Button Head Screws – 316 Stainless Steel (8–60mm)
If you’re working on a boat, outdoor furniture, or any project near saltwater, you know that standard stainless doesn’t always cut it. These M5 Phillips button head machine bolts are made from 316 stainless steel – marine‑grade material with molybdenum for superior resistance to corrosion, oxidation, and chlorides. The low‑profile button head gives a clean, rounded finish that won’t snag, while the Phillips drive makes installation straightforward with common tools. Available in lengths from 8mm up to 60mm (measured under the head), these fully threaded bolts are perfect for marine hardware, chemical equipment, coastal architecture, and any application where rust simply isn’t an option.
✨ Why 316 Stainless Button Head Screws Are Worth the Upgrade
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316 stainless steel (marine grade) – Contains molybdenum for exceptional resistance to saltwater, de‑icing salts, and industrial chemicals. Outperforms standard 304 in harsh environments.
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Button head (low dome) – Smooth, rounded profile sits close to the surface. Won’t catch on cables, fabric, or skin. Great for railings, docks, and visible assemblies.
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Phillips drive – Works with standard #2 Phillips screwdrivers. No special bits required, though a quality driver reduces cam‑out.
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M5 metric diameter – A versatile medium size, strong enough for structural fastening yet compact enough for appliance repair, furniture, and light machinery.
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Lengths from 8mm to 60mm (under head) – Choose from a wide range: 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm. Perfect for thin panels or thick assemblies.
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Fully threaded, coarse pitch (M5 x 0.8) – Threads run the entire shank length. Maximum grip in thin materials and consistent fit with standard M5 nuts.
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High strength and toughness – 316 stainless offers excellent mechanical properties, ensuring long‑term reliability even under vibration or load.
📏 Technical Specifications – M5 Button Head Phillips Screws (316 SS)
| Specification |
Details |
| Product Type |
Phillips Button Head Machine Screws / Bolts |
| Material |
316 Stainless Steel (marine grade, A4 equivalent) |
| Thread Diameter (Screw Size) |
M5 (5mm) |
| Thread Pitch |
0.8mm (standard metric coarse) |
| Thread Type |
Fully threaded (full length from under head to tip) |
| Length Range |
8mm to 60mm (measured from underside of head – excludes button head height) |
| Head Style |
Button head (low-profile rounded dome) |
| Drive Style |
Phillips cross‑head |
| System of Measurement |
Metric |
| Finish |
Natural stainless steel (unplated, bright) |
| Corrosion Resistance |
Excellent – saltwater, oxidation, chemicals |
❓ FAQs – M5 316 Stainless Button Head Screws
🔸 What’s the difference between 316 and 304 stainless steel for screws?
316 contains molybdenum, which dramatically improves resistance to chlorides – that means saltwater, road salt, and many industrial chemicals. 304 is fine for most indoor and mild outdoor use, but 316 is the standard for marine, coastal, and chemical environments. It costs a bit more but lasts much longer in harsh conditions.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the button head to the tip. Length is measured from under the head (the flat bearing surface) to the tip. The button head itself adds about 2‑3mm extra height. For example, an M5 x 20mm screw has 20mm of threaded shank below the head.
🔸 What Phillips screwdriver size works best for M5 button head screws?
M5 typically uses a #2 Phillips (PH2) screwdriver. A good quality PH2 bit with a sharp tip will engage well and reduce cam‑out. Avoid using a worn or undersized driver.
🔸 Will these screws rust in saltwater?
316 stainless is highly resistant to saltwater corrosion and is the go‑to choice for boat hardware, dock fittings, and submerged applications. While no metal is completely immune to crevice corrosion in stagnant, low‑oxygen conditions, 316 performs excellently for most marine use. Rinse occasionally for maximum lifespan.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are machine screws – they are designed to be used with a matching M5 nut or screwed into a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with 316 stainless steel nuts.
🔸 What lengths are available? How do I choose the right length?
We offer M5 lengths from 8mm to 60mm in standard increments (8, 10, 12, 16, 20, 25, 30, 40, 50, 60mm). To choose, measure the thickness of the materials you’re fastening, then add enough length for full nut engagement (at least 2‑3 threads beyond the nut). Length is measured under the head.
