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When you're working on a boat, dock, outdoor furniture near the coast, or any project exposed to saltwater and harsh chemicals, standard stainless steel isn't always enough. These M5 Phillips button head machine screws are manufactured from 316 stainless steel — marine-grade material containing molybdenum for dramatically superior resistance to saltwater, chlorides, and industrial chemicals compared to standard 304 stainless.
The low-profile button head delivers a smooth, rounded finish that sits close to the surface without snagging on cables, fabric, or skin — ideal for visible assemblies on railings, docks, and marine hardware. The Phillips cross drive works with standard #2 Phillips screwdrivers and power bits for fast, reliable installation. Fully threaded M5 × 0.8mm pitch, available in lengths from 8mm to 60mm (measured under the head).
Perfect for marine fittings, boat deck hardware, coastal construction, chemical plant equipment, outdoor furniture, and any application where long-term corrosion resistance is non-negotiable. Select your thread length and quantity from the options above.
Deck hardware, railings, cleats, hatches, and fittings exposed to saltwater and sea spray. 316 stainless is the industry standard for marine fasteners where 304 would corrode within a season.
Equipment assemblies in chemical plants, food processing facilities, and coastal industrial sites where chlorides, acids, and cleaning agents demand superior corrosion resistance.
Garden furniture, pergolas, decking, and outdoor structures in high-humidity or coastal climates where standard fasteners rust and stain surrounding materials.
Enclosures, panels, and equipment housings where a low-profile button head and clean stainless finish are required alongside reliable corrosion resistance.
| Material | 316 Stainless Steel (A4 equivalent) — 16–18% Cr, 10–14% Ni, 2–3% Mo |
|---|---|
| Head Style | Button head (low-profile rounded dome) |
| Drive Style | Phillips cross recess (#2 PH2) |
| Thread Diameter | M5 (5mm) |
| Thread Pitch | 0.8mm (standard metric coarse) |
| Thread Type | Fully threaded (full length from under head to tip) |
| Length Range | 8mm – 60mm (measured under head, excluding button head height) |
| Available Lengths | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60mm |
| Finish | Natural stainless steel (unplated, bright) |
| Corrosion Resistance | Excellent — resists saltwater, chlorides, acids, and industrial chemicals |
| Magnetic | Generally non-magnetic (may be slightly magnetic after cold working) |
| Available Quantities | 3, 10, 20, 30, 50, or 100 pieces per order |
| Typical Applications | Marine hardware, boat fittings, docks, chemical plants, food processing, outdoor furniture, coastal construction |
316 stainless contains molybdenum (2–3%), which dramatically improves resistance to pitting and crevice corrosion from chlorides — including saltwater, road salt, and many industrial chemicals. 304 is suitable for most indoor and mild outdoor use, but 316 is the standard for marine, coastal, and chemical environments. It costs slightly more but lasts significantly longer in harsh conditions.
Yes — these screws are fully threaded from just under the button head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip of the screw. The button head itself adds approximately 2–3mm of additional height above the surface. For example, an M5 × 20mm screw has 20mm of threaded shank below the head.
M5 button head screws typically use a #2 Phillips (PH2) screwdriver or bit. Use a quality driver with a sharp, well-fitting tip to minimize cam-out and avoid damaging the head, especially when driving into harder materials or at higher torque.
316 stainless is highly resistant to saltwater corrosion and is the go-to choice for boat hardware, dock fittings, and coastal applications. While no metal is completely immune to crevice corrosion in stagnant, low-oxygen conditions, 316 performs excellently for the vast majority of marine use. Occasional rinsing with fresh water will maximize service life.
These are machine screws — they are designed to be used with a matching M5 × 0.8mm nut or threaded into a pre-tapped hole. They are not self-tapping and will not cut their own threads. For best corrosion resistance throughout the assembly, pair them with 316 stainless steel M5 nuts and washers.
Measure the total thickness of the materials you are fastening together. Add enough additional length for full nut engagement — typically at least 2–3 full threads should protrude beyond the nut. Remember that length is measured under the head, so the button head height is not included. When in doubt, size up slightly rather than down.
316 stainless is widely used in food and beverage industries due to its corrosion resistance, ease of cleaning, and non-toxic properties. These screws are generally suitable for food processing environments. For applications requiring specific regulatory compliance, verify against applicable FDA or EU food contact material standards before use.
