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Corroded steel screws, mismatched finishes, and fasteners that stand proud of the surface are frustrating setbacks on any precision project. Whether you're a woodworker fitting hardware, an electrician securing panel components, or a DIYer assembling furniture and fixtures, a flush-mount fastener that won't rust is non-negotiable. These brass Phillips countersunk flat head machine screws deliver exactly that — a clean, flush finish with the corrosion resistance that only solid brass can provide.
Each screw is machined from H59-3 brass to GB standard, offering excellent corrosion resistance, high strength, good toughness, and superior cutting performance. Available in M5, M6, and M8 thread diameters with lengths ranging from 8mm to 60mm (0.31" to 2.36"), these screws cover the most common metric countersunk fastener needs in a single listing. Pack sizes from 1 to 500 pieces let you order exactly what your project demands.
Ideal for cabinetry hardware, electrical enclosures, furniture assembly, marine fittings, plumbing fixtures, and decorative metalwork where a flush, corrosion-resistant fastener is required. The 90° countersunk head profile sits flush with or below the surface when installed in a properly prepared hole, eliminating snag points and delivering a professional finish.
| Screw Type | Phillips Countersunk Flat Head Machine Screw |
|---|---|
| Thread Sizes | M5, M6, M8 |
| Length Range (Total, Including Head) | 8mm – 60mm (0.31" – 2.36") |
| Material | H59-3 Brass |
| Surface Finish | Natural Brass (No Coating) |
| Drive Style | Phillips (Cross Head) |
| Head Style | Countersunk Flat Head (90°) |
| Thread Standard | GB / ISO Metric |
| Grade | Grade 5 |
| Pack Quantities | 1 / 3 / 5 / 10 / 20 / 25 / 30 / 50 / 100 / 200 / 250 / 300 / 500 Pcs |
| Recommended Driver Bit | PH2 (M5–M6), PH3 (M8) |
| Corrosion Resistance | Excellent (brass, no rust) |
| Compatibility | Standard metric nuts, threaded inserts, tapped holes |
These screws are available in M5, M6, and M8 metric thread sizes. Lengths vary by diameter — M5 ranges from 8mm to 50mm, M6 from 8mm to 50mm, and M8 from 12mm to 60mm. Select your Thread Dia.×Length from the variant dropdown above.
These screws are machined from H59-3 brass to GB standard. H59-3 brass offers excellent corrosion resistance, high strength, good toughness, and superior cutting performance — making it a reliable choice for both functional and decorative fastening applications.
Yes. Brass naturally resists corrosion and does not rust, making it well-suited for outdoor, humid, and marine-adjacent environments where steel fasteners may corrode over time. For fully submerged or saltwater applications, consider marine-grade stainless steel instead.
Use a PH2 bit for M5 and M6 screws, and a PH3 bit for M8. Always use a properly sized bit to prevent cam-out and avoid damaging the head recess, especially in brass which is softer than steel.
A countersunk screw has a flat, angled head (90° on these screws) designed to sit flush with or below the surface of the material. To install correctly, drill a clearance hole and then use a countersink bit to create the matching 90° recess before driving the screw.
For countersunk screws, the listed length is the total length including the head. The screw should engage at least 1.5× the thread diameter into the receiving material — for example, an M6 screw should typically engage at least 9mm of thread for a secure hold.
Yes. These screws follow GB/ISO metric thread specifications and are compatible with standard metric hex nuts, nylon lock nuts, and heat-set or press-fit threaded inserts of the corresponding size.
