🔩 Product Overview: M2–M4 Phillips Domed Button Screws (A2 Stainless Steel)
Ever had a small screw rust solid after a few months outdoors, or struggled to drive a Phillips head that keeps camming out? These M2, M2.5, M3, and M4 Phillips button head machine bolts are made from A2 (304) stainless steel, so they won’t turn brown or seize up. The domed head gives a clean, finished look on panels, electronics, or furniture, while the full thread design grabs tight even in shallow holes. Whether you’re repairing a boat, building a 3D printer, or just replacing rusted screws on outdoor gear, these metric stainless steel screws handle moisture and temperature changes without breaking a sweat.
✨ Why These A2 Stainless Phillips Button Screws Belong in Your Shop
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A2 (304) stainless steel construction – 18% chromium, 8% nickel makes them highly resistant to rust and corrosion. Perfect for kitchens, marine use, outdoor furniture, and anything near moisture.
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Phillips drive with cam-out reduction – The cross recess is designed for even force distribution, so your screwdriver stays engaged. Less slipping means fewer stripped heads and faster assembly.
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Domed button head – Low-profile rounded top that won’t snag on cables or fabric. Gives projects a professional, finished appearance.
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Fully threaded from tip to underside of head – No partial shank. That means maximum thread engagement in thin materials or blind holes. Length is measured from under the head, so you get the exact grip length you expect.
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Metric sizes M2, M2.5, M3, M4 with lengths 3mm–60mm – Four diameters and a huge length range cover small electronics up to light machinery. Choose exactly what your project needs.
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A2-70 tensile strength (700 N/mm²) – Strong enough for most DIY and industrial fastening tasks, from car trim to appliance repair to RC model building.
📏 Technical Specifications – Phillips Button Head Machine Screws (Metric)
| Specification |
Details |
| Product Type |
Phillips Button Head Machine Screws / Domed Head Bolts |
| Material |
A2 Stainless Steel (304 / 18-8) |
| Grade |
A2-70 (Tensile strength 700 N/mm²) |
| Finish |
Stainless steel – natural, no additional plating |
| Drive Style |
Phillips cross-head |
| Head Style |
Domed Button Head (low profile, rounded) |
| System of Measurement |
Metric |
| Thread Diameters |
M2, M2.5, M3, M4 |
| Length Range |
3mm to 60mm (measured from underside of head, excludes head height) |
| Thread Type |
Fully threaded (full thread from under head to tip) |
| End Type |
Closed / flat end |
| Standard |
GB/T |
| Magnetic Properties |
Almost non-magnetic (slightly magnetic due to cold working) |
❓ Frequently Asked Questions – A2 Stainless Phillips Button Screws
🔸 Will these M2–M4 stainless screws rust in saltwater or a marine environment?
A2 (304) stainless has excellent resistance to fresh water, humidity, and mild salt spray. For constant saltwater immersion (like below-deck boat fittings), marine-grade 316 is better, but for deck hardware, kayak accessories, or coastal workshop use, these hold up very well without the red rust you'd get from plated steel.
🔸 How do I measure the length correctly for these button head screws?
Length is measured from the underside of the head (where the head meets the shank) to the very tip of the screw. The domed button head itself adds about 1–2mm of extra height on top. For example, a “10mm length” will have 10mm of thread/shaft below the head, not counting the dome.
🔸 Are these screws fully threaded or partially threaded?
Fully threaded – threads run continuously from just under the button head all the way to the end. This gives you maximum grip in thin materials and allows you to use the entire length in tapped holes or with nuts.
🔸 What Phillips screwdriver size works best for M2, M2.5, M3, and M4?
For M2 and M2.5, use a PH0 or PH00 bit. For M3 and M4, a PH1 or PH2 (PH1 is usually best for M3, PH2 for M4). Using the correct size prevents stripping and makes driving much smoother.
🔸 Can I use these screws outdoors or in high-moisture areas?
Absolutely – A2 stainless is designed for exterior applications. It’s commonly used in railings, outdoor furniture, food equipment, and architectural trim. Just avoid long-term direct contact with chlorinated water (like pools) or heavy industrial chemicals, which can eventually cause pitting.
🔸 Do you sell matching nuts or washers for these metric screws?
These screws are sold as individual bolts, but standard metric stainless steel nuts (M2, M2.5, M3, M4) are widely available. A small flat washer under the button head is optional – the domed head itself doesn’t require a washer unless you're bearing on a very soft material.
