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These Phillips flat head countersunk machine screws are designed to sit flush with or below the surface of the mating material when installed in a properly countersunk hole. The 90-degree conical head profile conforms to ISO metric standards, providing a clean, snag-free finish in panels, enclosures, brackets, and precision assemblies. Available in seven metric sizes from M1.4 to M5, with three coating options — white zinc, nickel, and black zinc — to suit different aesthetic and corrosion resistance requirements.
The small sizes (M1.4, M1.6, M2, M2.5) are widely used in electronics, laptops, cameras, and precision instruments. The larger sizes (M3, M4, M5) are suitable for general hardware, panel assembly, furniture, and structural applications. All sizes use ISO metric coarse pitch threads and require a pre-tapped hole, threaded insert, or nut — these are not self-tapping screws.
| Screw Type | Machine Screw — Flat Head (Countersunk) |
|---|---|
| Head Type | Flat Head / Countersunk (90° conical head angle, ISO metric) |
| Drive Type | Phillips (Cross Recess) |
| Thread Standard | ISO Metric Coarse Pitch |
| Available Sizes | M1.4, M1.6, M2, M2.5, M3, M4, M5 |
| Thread Pitches | M1.4: 0.3mm | M1.6: 0.35mm | M2: 0.4mm | M2.5: 0.45mm | M3: 0.5mm | M4: 0.7mm | M5: 0.8mm |
| Phillips Driver Sizes | M1.4 / M1.6: PH0 | M2 / M2.5: PH1 | M3 / M4 / M5: PH2 |
| Available Lengths (M1.4) | 3, 4, 5, 6mm |
| Available Lengths (M1.6) | 3, 4, 5, 6mm |
| Available Lengths (M2) | 3, 4, 5, 6, 8, 10, 12, 14mm |
| Available Lengths (M2.5) | 4, 5, 6, 8, 10, 12, 14, 16mm |
| Available Lengths (M3) | 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20mm |
| Available Lengths (M4) | 6, 8, 10, 12, 14, 16, 20mm |
| Available Lengths (M5) | 8, 10, 12, 16, 20mm |
| Coating Options | White Zinc (clear zinc plating) | Nickel plating | Black Zinc (black chromate) |
| Pack Quantity Options | 5 / 10 / 20 / 50 / 100 pcs (varies by size and coating) |
| Head Angle | 90° (ISO metric countersunk standard) |
| Self-Tapping | No — requires pre-tapped hole or nut |
| Countersinking Required | Yes — for flush installation |
A countersunk machine screw has a conical head designed to sit flush with or below the surface of the mating material when installed in a countersunk hole. The head angle for ISO metric countersunk screws is 90 degrees. When installed correctly, the head is flush with the surface, providing a clean, snag-free finish. Used in electronics enclosures, panels, hinges, and structural assemblies where a flush surface is required.
White zinc (clear zinc plating) provides standard corrosion resistance with a bright silver appearance — the most common coating for general-purpose steel fasteners. Nickel plating provides a bright silver finish with slightly better corrosion resistance, commonly used in electronics and precision instruments. Black zinc (black chromate over zinc) provides a dark matte or semi-gloss black finish for aesthetic applications in electronics, audio equipment, and consumer products.
M1.4 and M1.6: PH0 (Phillips #0). M2 and M2.5: PH1 (Phillips #1). M3, M4, and M5: PH2 (Phillips #2). Using the correct driver size reduces cam-out and head damage.
Yes, for a flush installation. The mating material must have a countersunk (chamfered) hole matching the 90° head angle. Without countersinking, the head will protrude above the surface. Countersinking can be done with a countersink drill bit or a combined drill-and-countersink bit.
No. These are machine screws with a standard ISO metric coarse thread. They require a pre-tapped hole, threaded insert, or nut. They will not cut their own thread into material.
Countersunk machine screws are used where a flush or recessed head is required: electronics enclosures, PCB mounting brackets, panel assembly, hinges, furniture hardware, automotive interior trim, and any application where a protruding screw head would be a snag hazard or aesthetic issue. The small sizes (M1.4, M1.6, M2) are commonly used in electronics, cameras, laptops, and precision instruments.
ISO metric coarse pitch: M1.4 (0.3mm) | M1.6 (0.35mm) | M2 (0.4mm) | M2.5 (0.45mm) | M3 (0.5mm) | M4 (0.7mm) | M5 (0.8mm). Compatible with standard metric nuts, threaded inserts, and tapped holes.
