A4 Stainless Flanged Button Head Screws – M3 to M6, Phillips Drive, Marine Grade (4–50mm Lengths) $1.70 USD

A4 Stainless Flanged Button Head Screws – M3 to M6, Phillips Drive, Marine Grade (4–50mm Lengths)

Name: A4 Stainless Flanged Button Head Screws – M3 to M6, Phillips Drive, Marine Grade (4–50mm Lengths)
Brand: HomeDIYer
SKU: GYYKMGBRT14552x5
Price: 1.7 USD
Availability: InStock

$1.70 USD

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🔩 M3–M6 Flanged Button Head Screws – A4 Stainless Steel, Phillips Drive, Corrosion‑Resistant for Marine & Industrial Use

You're bolting down deck hardware on a boat, assembling outdoor furniture near the coast, or working in a chemical plant – and standard stainless just isn't enough. These flanged button head screws are made from A4 stainless steel (316 grade), giving you superior resistance to saltwater, chlorides, and harsh chemicals. The integrated flange acts as a built‑in washer, spreading the load without an extra part. The low button head sits close to the surface for a clean look, while the Phillips drive offers reliable engagement. Available in M3, M4, M5, and M6 diameters, with lengths from 4mm to 50mm (under head). Perfect for marine fittings, industrial equipment, automotive trim, and any environment where corrosion is a constant battle.

✨ Key Features – A4 Stainless Flanged Button Head Phillips Screws

🔘 Flanged button head (integrated washer) – The wide flange distributes clamping pressure evenly, prevents pull‑through, and eliminates the need for a separate flat washer.
🛡️ A4 stainless steel (316 / 1.4401) – Superior corrosion resistance – ideal for marine, coastal, and chemical environments. Contains molybdenum for extra protection against chlorides and saltwater.
💪
Phillips drive – Standard cross recess works with common screwdrivers and bits. Good torque transfer without cam‑out.
📏 Metric sizes M3, M4, M5, M6 – Popular diameters for electronics, furniture, industrial equipment, and marine hardware.
📐 Lengths from 4mm to 50mm (under head) – Wide range to suit shallow panels or thicker assemblies. Fully threaded for most lengths; longer M5/M6 may have partial threads.
💪 High strength & toughness – A4 stainless offers high tensile strength (approx. 700 N/mm²), good impact resistance, and excellent abrasion resistance.
🌊 Widely used – Electronic products, furniture decoration, industrial plants, car and boat fittings, and outdoor installations.

📏 Available Sizes – M3 to M6 Flanged Button Head Screws (A4 Stainless)

Thread Diameter	Length Range (mm, under head) *	Thread Pitch (mm)	Head Style	Drive	Material
M3	4 – 30	0.5	Flanged button head	Phillips	A4 Stainless (316)
M4	5 – 40	0.7
M5	6 – 50	0.8
M6	8 – 50	1.0

* Length is measured from the underside of the head (excluding the head and flange). All screws are fully threaded for lengths up to ~30mm; longer screws may have a partial thread (unthreaded shank). Select exact sizes from dropdown.

📋 Material Grade – A4 Stainless Steel (316 / 1.4401)

Property	Details
Grade	A4 stainless steel (316 / 1.4401) – contains 16‑18% Cr, 10‑14% Ni, 2‑3% Mo
Corrosion resistance	Excellent – resists saltwater, chlorides, acids, and industrial chemicals. Superior to A2 (304).
Strength	High – tensile strength ~700 N/mm² (A4‑70). Good toughness and impact resistance.
Magnetic	Almost non‑magnetic (slightly magnetic after cold working).
Typical applications	Marine hardware, boat fittings, chemical plants, food processing, outdoor furniture, coastal construction.

❓ Frequently Asked Questions – A4 Stainless Flanged Button Head Screws

1. Why choose A4 stainless over A2 (304) for marine use?

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.

2. What’s a flanged button head screw? Why choose it over a regular pan head?

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 doesn't stick out.

3. Are these screws fully threaded? How do I measure length?

Length is measured from the underside of the head (the flat bearing surface just below the flange) to the tip. The flange and button head are not included. For lengths up to about 30mm (depending on diameter), screws are fully threaded. Longer screws may have a partial thread – meaning an unthreaded shank near the head. Check the product listing or contact us if you need full thread on a longer screw.

4. Can I use these screws in food processing equipment?

Yes – A4 (316) stainless is widely used in food and beverage industries due to its corrosion resistance and ease of cleaning. It’s non‑toxic and resists acids from food products. However, for direct food contact, ensure the screws meet FDA or EU regulations – our A4 screws are generally suitable.

5. What screwdriver size do I need for these Phillips drives?

For M3: #0 or #1 Phillips; M4: #1; M5: #2; M6: #2 or #3. Always use a quality driver that fits snugly to avoid cam‑out and head damage.

6. The product title says “Pozi” – are these Pozidriv or Phillips?

These screws have a standard Phillips cross recess. The term “Pozi” in the title is used for search visibility, but the actual drive is Phillips. They will work with Pozidriv bits in an emergency, but for best results, use a genuine Phillips driver.