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When a protruding screw head is not an option — whether you're assembling fine furniture, fitting decorative hardware, or building an electronics enclosure — you need a fastener that disappears into the surface. These solid brass flat countersunk head Phillips machine screws deliver exactly that: a smooth, flush finish with the warm, distinctive look that only real brass provides. Designed for makers, woodworkers, hobbyists, and hardware enthusiasts who refuse to compromise on the details.
Each screw is machined from solid brass and features a flat countersunk head with a Phillips (cross) drive. Available in three metric diameters — M4, M5, and M6 — with lengths ranging from 10mm (3/8") to 40mm (1-9/16"), including 12mm (15/32"), 16mm (5/8"), 20mm (25/32"), 25mm (1"), 30mm (1-3/16"), and 35mm (1-3/8"). Choose from pack sizes of 5, 10, 30, or 50 pieces to match your project scale.
These brass countersunk machine screws are a go-to choice for cabinet and furniture assembly where a flush, decorative fastener is required; for electronics and instrument enclosures where non-magnetic fasteners prevent interference; and for marine or bathroom fittings where corrosion resistance matters. Long-tail use cases include brass screws for wooden jewelry boxes, brass machine screws for guitar hardware, and metric countersunk screws for DIY home improvement projects.
| Material | Solid Brass |
|---|---|
| Finish | Natural brass (uncoated) |
| Head Style | Flat Countersunk |
| Drive Type | Phillips (Cross / PH) |
| Thread Standard | Metric (ISO) |
| Available Diameters | M4, M5, M6 |
| Available Lengths (incl. head) | 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, 30, 50 pieces |
| Countersink Angle | Typically 90° — confirm with countersink bit spec |
| Magnetic | No (brass is non-magnetic) |
| Recommended Applications | Woodworking, cabinetry, electronics enclosures, decorative hardware, instrument assembly |
| 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 6mm thick, a 16mm (5/8") screw generally provides solid holding power. Remember that 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 machine screws are 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 grade-8 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, M5, and M6 refer to the nominal thread diameter in millimeters. They are compatible with any standard metric M4, M5, or M6 nut, threaded insert, or tapped hole manufactured to 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 your screw size will give you a perfectly flush, snag-free finish.
Each listing is available in four pack sizes: 5, 10, 30, or 50 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 30- or 50-piece pack offers better value per screw. Select your preferred quantity from the Pack Quantity option above.
These screws use a standard Phillips (cross) drive. For M4 screws, a PH2 bit is typically the correct fit. M5 and M6 screws generally also accept a PH2 or PH3 bit depending on head size. Always match the bit size carefully — using an undersized bit can cause cam-out and damage the drive recess, especially in softer brass.
