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When standard stainless steel isn't enough — whether you're rigging deck hardware on a boat, assembling outdoor furniture near the coast, or maintaining equipment in a chemical plant — you need a fastener built for the harshest conditions. These flanged button head screws are manufactured from A4 stainless steel (316 / 1.4401), delivering superior resistance to saltwater, chlorides, and industrial chemicals that would corrode ordinary A2 (304) screws over time.
Each screw features an integrated flange that acts as a built-in washer, spreading clamping load over a wider area without requiring a separate flat washer. The low-profile button head sits flush and clean against the surface, while the Phillips cross recess provides reliable engagement with standard drivers. Available in M3, M4, M5, and M6 diameters with thread lengths ranging from 4mm to 50mm (measured under the head).
Ideal for marine fittings, boat deck hardware, coastal construction, food processing equipment, chemical plant assemblies, outdoor furniture, and automotive trim — anywhere corrosion resistance is non-negotiable. Select your exact diameter, thread length, and quantity from the options above.
Deck hardware, cleats, hatches, and fittings exposed to saltwater and sea spray. A4 (316) stainless is the industry standard for marine fasteners where A2 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 near the coast or in high-humidity climates where standard fasteners rust and stain the surrounding material.
Enclosures, panels, and equipment housings where a low-profile button head and clean finish are required alongside reliable corrosion resistance in demanding operating environments.
| Material | A4 Stainless Steel (316 / 1.4401) — 16–18% Cr, 10–14% Ni, 2–3% Mo |
|---|---|
| Head Style | Flanged button head (integrated washer flange) |
| Drive Style | Phillips cross recess |
| Thread Diameter | M3, M4, M5, M6 |
| Thread Length Range | 4mm – 50mm (measured under head, excluding head and flange) |
| Thread Pitch | M3: 0.5mm / M4: 0.7mm / M5: 0.8mm / M6: 1.0mm |
| Thread Type | Fully threaded (lengths up to ~30mm); longer lengths may have partial thread |
| Tensile Strength | Typically 700 N/mm² (A4-70 grade) |
| Corrosion Resistance | Excellent — resists saltwater, chlorides, acids, and industrial chemicals |
| Magnetic | Generally non-magnetic (may be slightly magnetic after cold working) |
| Available Quantities | 5, 10, 20, 50, or 100 pieces per order |
| Typical Applications | Marine hardware, boat fittings, chemical plants, food processing, outdoor furniture, coastal construction, electronics enclosures |
A4 stainless (316) contains molybdenum, which dramatically improves resistance to pitting and crevice corrosion from saltwater and chlorides. For boats, docks, coastal construction, or any application near the sea, A4 is the recommended choice. A2 (304) can still rust in harsh marine environments over time, leaving rust stains on surrounding materials.
A flanged button head has an integral washer-like flange under the head. This flange distributes clamping force over a larger area, reducing the risk of pull-through in soft materials like plastic, fiberglass, or thin sheet metal. It also eliminates the need for a separate flat washer, saving assembly time. The button head itself is low profile, so it sits close to the surface for a cleaner look.
Length is measured from the underside of the head (the flat bearing surface just below the flange) to the tip of the screw. The flange and button head are not included in the measurement. For lengths up to approximately 30mm, screws are generally fully threaded. Longer screws may have a partial thread — meaning an unthreaded shank near the head.
A4 (316) stainless is widely used in food and beverage industries due to its corrosion resistance and ease of cleaning. It is non-toxic and resists acids from food products. 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.
Use a #0 or #1 Phillips for M3, a #1 Phillips for M4, a #2 Phillips for M5, and a #2 or #3 Phillips for M6. Always use a quality driver that fits snugly in the recess to avoid cam-out and head damage, especially when driving into harder materials.
Yes. The flanged head is particularly well-suited for softer materials like aluminum, plastic, and fiberglass because the wide flange distributes load and prevents the head from pulling through. A4 stainless is also galvanically compatible with aluminum in most environments, reducing the risk of galvanic corrosion compared to carbon steel fasteners.
Both are A4 (316) stainless steel, but A4-80 has a higher tensile strength (typically 800 N/mm²) compared to A4-70 (typically 700 N/mm²). These screws are generally A4-70 grade, which is suitable for the vast majority of marine, industrial, and outdoor applications. If your application requires higher clamping force, contact us to confirm the grade before ordering.
