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When you need a fastener that combines a clean, low-profile appearance with reliable corrosion resistance — and you want to drive it with a standard flat-blade screwdriver without hunting for a hex key — A2 stainless steel button head slotted machine screws are a practical, versatile choice. Woodworkers, furniture makers, electronics assemblers, and outdoor fixture installers frequently reach for button head slotted screws when the rounded dome head needs to look good on a visible surface and the assembly environment involves moisture or humidity.
Each screw features a low-profile domed button head with a slotted (flat-blade) drive recess, manufactured from A2 stainless steel (304 grade) to the GB67 standard. Thread diameters available are M3, M4, and M5, with lengths ranging from 5mm (≈3/16") to 30mm (≈1-3/16"), covering the most common sizes for light engineering, furniture hardware, and enclosure assembly. Available in packs of 10, 20, 50, or 100 pieces, making it easy to order the right quantity for prototyping, repair, or small-batch production.
These A2 stainless steel button head slotted screws are commonly used in outdoor furniture and garden fixture assembly where corrosion resistance is needed alongside a clean aesthetic; in electronics enclosures and instrument panels where a rounded, snag-free head profile is preferred; and in woodworking and cabinetry projects where a flat-blade drive is more convenient than a hex key and the domed head provides a finished, decorative appearance.
| Standard | GB67 (ISO Metric Coarse Thread) |
|---|---|
| Thread Diameters | M3, M4, M5 |
| Lengths Available | 5mm (≈3/16") – 30mm (≈1-3/16") |
| Head Type | Button Head (Low-Profile Dome) |
| Drive Type | Slotted (Flat-Blade) |
| Recommended Blade Width | M3: ≈4mm | M4: ≈5.5mm | M5: ≈6.5mm |
| Material | A2 Stainless Steel (304 Grade) |
| Corrosion Resistance | Good — suitable for outdoor and humid environments; not recommended for marine/salt spray (use A4/316 for those) |
| Thread Type | Machine thread (not self-tapping) |
| Pack Quantities | 10, 20, 50, or 100 pcs (see variant options) |
| Country of Origin | Contact us to confirm |
For button head screws, the listed length is the shank length only — the domed head sits above the surface. Choose a length that provides adequate thread engagement in the mating material: generally at least 1.5× the screw diameter for metal, and 2–3× for softer materials. For reference: 5mm ≈3/16", 8mm ≈5/16", 10mm ≈3/8", 16mm ≈5/8", 20mm ≈3/4", 25mm ≈1", 30mm ≈1-3/16".
A2 stainless steel (304 grade) generally has a tensile strength of around 500–700 MPa depending on the property class. Button head screws typically have a lower drive torque limit than socket cap or hex head screws of the same diameter due to the shallower head height. They are generally suited for light to medium-duty fastening where corrosion resistance is a priority. For high-load structural applications, a hex head or socket cap screw in a higher property class is typically recommended.
A2 stainless steel (304) provides good corrosion resistance in most outdoor and mildly humid environments, making it a common choice for outdoor furniture, garden fixtures, and general exterior applications. However, for marine environments or areas with prolonged salt spray exposure, A4 stainless steel (316 grade) is generally recommended for superior chloride resistance.
These screws follow the GB67 standard with ISO metric coarse threads — M3, M4, and M5. They are compatible with standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. They are not compatible with UNC or UNF inch-thread fasteners.
These screws use a standard flat-blade (slotted) drive. Use a flat-head screwdriver with a blade width that fits snugly in the slot without overhanging the head — typically a 0.8×4mm blade for M3, a 1.0×5.5mm blade for M4, and a 1.2×6.5mm blade for M5. Using an oversized blade risks damaging the surrounding material or the screw head.
A button head screw has a low-profile domed head that sits above the surface, providing a smooth, rounded appearance with no sharp edges — making it a good choice for visible fastening in furniture, enclosures, and decorative applications where aesthetics matter. Pan head screws have a flatter, wider head. Flat head (countersunk) screws are designed to sit flush with the surface. Choose button head when you want a clean, rounded look without countersinking.
GB67 is the Chinese national standard for slotted button head machine screws, while ISO 1580 is the international standard for slotted pan head machine screws. The head geometry differs slightly between standards. In practice, for M3–M5 sizes, the thread dimensions are identical (ISO metric coarse), so these screws will thread into any standard metric tapped hole or nut. If your application requires strict dimensional compliance to a specific standard, contact us to confirm.
