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Whether you’re assembling fine furniture, fitting decorative cabinet hardware, building a wooden jewelry box, or finishing a bathroom fixture, a protruding screw head is never the look you want. These solid brass flat countersunk Phillips machine screws deliver a clean, flush finish with the warm, distinctive appearance that only real brass provides — making them the go-to M4 fastener for woodworkers, makers, and hardware enthusiasts who care about the details.
Each screw is machined from solid brass (not plated) and features a flat countersunk head with a Phillips (cross) drive. Available in M4 diameter across ten lengths: 6mm (15/64”), 8mm (5/16”), 10mm (3/8”), 12mm (15/32”), 16mm (5/8”), 20mm (25/32”), 25mm (1”), 30mm (1-3/16”), 35mm (1-3/8”), and 40mm (1-9/16”). Choose from pack sizes of 5, 10, 20, 40, 60, 100, or 200 pieces to match your project scale.
These brass countersunk machine screws are a natural fit for cabinet and furniture assembly where a flush, decorative fastener is required; for marine and bathroom fittings where corrosion resistance matters in humid environments; and for instrument cases, wooden enclosures, and DIY home improvement projects where a non-magnetic, rust-resistant M4 fastener is the right call.
| Material | Solid Brass |
|---|---|
| Finish | Natural brass (uncoated) |
| Head Style | Flat Countersunk |
| Drive Type | Phillips (Cross / PH2) |
| Thread Standard | Metric (ISO), M4 |
| Thread Diameter | M4 (4mm / 5/32” nominal) |
| Available Lengths | 6mm (15/64”), 8mm (5/16”), 10mm (3/8”), 12mm (15/32”), 16mm (5/8”), 20mm (25/32”), 25mm (1”), 30mm (1-3/16”), 35mm (1-3/8”), 40mm (1-9/16”) |
| Pack Quantities | 5, 10, 20, 40, 60, 100, 200 pieces |
| Countersink Angle | Typically 90° — confirm with countersink bit spec |
| Magnetic | No (brass is non-magnetic) |
| Recommended Applications | Cabinetry, furniture, bathroom fittings, instrument hardware, wooden enclosures, DIY home improvement |
| Country of Warehouse | United States |
A reliable rule of thumb is to select a length where at least two-thirds of the screw engages the base material. For example, if your top panel is 8mm thick, a 20mm (25/32”) screw generally provides solid holding power. The countersunk head sits flush with — not above — the surface, so the full listed length contributes to grip depth. When in doubt, size up rather than down.
Solid brass M4 machine screws are generally well-suited for light-to-medium duty fastening in wood, MDF, plastic, and soft metals. They are commonly used in furniture, cabinetry, instrument hardware, and decorative fittings. Brass is softer than steel, so these screws are not recommended for high-load structural connections or applications subject to heavy vibration — in those cases, stainless steel or hardened steel fasteners are typically the better choice.
Yes — brass is naturally corrosion-resistant and performs well in humid indoor environments and light outdoor use, such as garden furniture, bathroom fittings, and covered exterior trim. For prolonged exposure to saltwater, coastal air, or standing water, a marine-grade stainless steel fastener is generally more appropriate for long-term durability.
These are standard ISO metric machine screws. M4 refers to a 4mm nominal thread diameter. They are compatible with any standard metric M4 nut, threaded insert, or tapped hole manufactured to the ISO 68-1 thread profile. They are not compatible with UNC/UNF (imperial) threads.
Yes, provided you use a countersink bit to prepare the hole before driving the screw. The flat countersunk head is designed to sit flush when the countersink angle matches the screw head angle — typically 90°. Using a countersink bit of the correct angle and diameter for M4 will give you a perfectly flush, snag-free finish. Driving the screw without countersinking first will leave the head proud of the surface.
Each listing is available in seven pack sizes: 5, 10, 20, 40, 60, 100, or 200 pieces. For a small repair or prototype, the 5- or 10-piece pack is usually sufficient. For furniture builds, cabinetry runs, or workshop stock, the 60- to 200-piece packs offer better value per screw. Select your preferred quantity from the Pack Quantity option above.
These M4 screws use a standard Phillips (cross) drive. A PH2 bit is typically the correct fit for M4 screws. Always match the bit size carefully — using an undersized bit can cause cam-out and damage the drive recess, especially in softer brass. For best results, use a hand screwdriver or set your drill to a low torque setting to avoid over-driving.
