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Sourcing small metric fasteners that won't corrode, strip, or require a separate washer is a constant frustration for electronics builders, robotics hobbyists, and precision fabricators. These flanged Phillips button head machine screws solve all three problems in a single fastener — giving engineers, makers, and repair technicians a reliable go-to for tight-tolerance assemblies.
Each screw is machined from A2-grade 304 stainless steel with a low-profile button head and an integrated load-spreading flange. Available in thread diameters M2, M2.5, M3, M4, and M5, with lengths ranging from 3mm to 40mm depending on diameter. Order in packs of 10, 30, 50, 100, or 500 to match your project scale — from one-off prototypes to production runs.
These flanged button head screws are a natural fit for 3D printer frame assembly, RC car chassis, electronics enclosures, PCB mounting, aluminum extrusion builds, and robotics platforms where a clean, low-profile fastener with a wide bearing surface is essential.
| Material | 304 Stainless Steel (A2-70 equivalent) |
|---|---|
| Head Style | Button head with integrated flange |
| Drive Type | Phillips (cross) — PH1 for M2–M3, PH2 for M4–M5 |
| Thread Standard | ISO metric coarse thread |
| Thread Diameters | M2, M2.5, M3, M4, M5 |
| Available Lengths | 3mm – 40mm (range varies by diameter; see variant options) |
| Pitch | M2: 0.4mm · M2.5: 0.45mm · M3: 0.5mm · M4: 0.7mm · M5: 0.8mm |
| Tensile Strength | Typically 500–700 MPa (304 SS) |
| Finish | Natural stainless — no plating or coating |
| Pack Quantities | 10 / 30 / 50 / 100 / 500 pcs |
| Corrosion Resistance | Good — suitable for indoor and light outdoor use |
| Country of Origin | See product listing or contact us to confirm |
A reliable rule of thumb is to ensure at least 1.5× the screw diameter of thread engagement in the receiving material. For example, an M3 screw (3mm diameter) generally needs at least 4.5mm of thread engagement. Add the thickness of all clamped parts to determine your minimum screw length. When fastening into plastic or 3D-printed parts, sizing up one length is often a good idea to account for material compliance.
Quick reference: 3mm ≈ 1/8" · 6mm ≈ 1/4" · 10mm ≈ 3/8" · 16mm ≈ 5/8" · 20mm ≈ 13/16" · 25mm ≈ 1" · 30mm ≈ 1-3/16" · 40mm ≈ 1-9/16"
These screws use ISO metric coarse thread — the most common metric standard worldwide. Pitches are: M2 = 0.4mm, M2.5 = 0.45mm, M3 = 0.5mm, M4 = 0.7mm, M5 = 0.8mm. They are compatible with standard metric hex nuts, nylon lock nuts, heat-set threaded inserts (e.g., for 3D printing), and tapped holes machined to ISO tolerances.
304 stainless steel provides good corrosion resistance and is generally suitable for indoor, humid, and light outdoor applications. It performs well in most everyday environments including electronics enclosures, garage workshops, and sheltered outdoor fixtures. For prolonged exposure to saltwater, chlorine, or highly acidic conditions, 316 stainless steel is typically the better choice. These screws are not recommended for direct marine immersion.
No — the integrated flange serves as a built-in washer. It spreads the clamping load over a larger contact area, which reduces surface indentation on softer materials like plastic, aluminum, and wood composites. This simplifies assembly, reduces part count, and eliminates the risk of a loose washer falling out during installation.
These screws use a Phillips (cross) drive. For M2 and M2.5, a PH0 or PH1 bit is typically correct. For M3, a PH1 bit is generally the right fit. For M4 and M5, use a PH2 bit. Always use the correct bit size to avoid cam-out, which can damage the head and make removal difficult. A hand screwdriver gives better feel for small M2–M3 screws; a low-torque power driver works well for M4–M5.
304 stainless steel machine screws typically have a tensile strength of approximately 500–700 MPa (roughly 70,000–100,000 psi), depending on manufacturing process and heat treatment. They are well-suited for light-to-medium load applications such as electronics assembly, robotics, and general fabrication. For high-vibration or heavy structural loads, consider using thread-locking compound (e.g., Loctite 243) and verify load requirements against the screw's rated capacity.
Yes — these are a popular choice for exactly these applications. The flanged button head is ideal for plastic and 3D-printed parts because the flange prevents pull-through without a washer. The low-profile button head keeps clearance tight in compact assemblies. For 3D-printed parts, pairing with heat-set threaded inserts (M2–M5 sizes are widely available) gives the strongest and most reusable thread. For PCB mounting, use with appropriate standoffs and nuts.
