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Finding the right small-diameter flat head screw in the correct material and finish is a recurring challenge for electronics assemblers, instrument makers, furniture builders, and general fabricators. When the fastener needs to sit flush with the surface — and the drive must be accessible with a standard flat-blade screwdriver — the options narrow quickly, especially at miniature sizes like M1.2 and M1.6.
These slotted countersunk head machine screws cover thread sizes from M1.2 to M6, with shank lengths from 3mm to 25mm (total length including head). Head diameters range from 2.3mm (M1.2) to 11.3mm (M6), with head thickness from 0.6mm to 3.4mm. Available in carbon steel, 304 stainless steel, and brass, with four finish options: Black Zinc, Brass Natural, 304 Stainless Steel Natural, and Nickel-Plated. Sold in packs of 100, 200, 300, 400, or 500 pieces.
Typical applications include electronics enclosures, optical and precision instruments, watch and clock assembly, furniture hardware, automotive interior panels, toy manufacturing, and general machinery where a flush, low-profile fastener is required.
| Head Style | Countersunk (Flat Head) |
|---|---|
| Drive Style | Slotted (Flat-Blade) |
| Thread Sizes Available | M1.2, M1.6, M2, M4, M5, M6 |
| Total Length Range (incl. head) | 3mm – 25mm |
| Head Diameter Range | 2.3mm (M1.2) – 11.3mm (M6) |
| Head Thickness Range | 0.6mm – 3.4mm |
| Tolerance | ±0.2mm |
| Material Options | Carbon Steel, 304 Stainless Steel, Brass |
| Finish / Coating Options | Black Zinc, Brass Natural, 304 Stainless Steel Natural, Nickel-Plated |
| Quantity per Pack | 100, 200, 300, 400, or 500 PCS |
| Thread Standard | Metric (non-standard series) |
| System of Measurement | Metric |
A countersunk (flat) head screw has a tapered underside that allows the head to sit flush with or below the surface of the material when driven into a countersunk hole. The slotted drive means it is tightened with a flat-blade screwdriver.
These screws use a standard flat-blade (slotted) screwdriver. Match the blade width to the slot width of the screw head for best torque transfer and to avoid damaging the slot.
Black Zinc offers a dark matte appearance with moderate corrosion resistance. Nickel-Plated provides a bright silver finish with good corrosion and wear resistance. Brass Natural is uncoated brass with a warm gold tone, suitable for decorative and electrical applications. 304 Stainless Steel Natural is uncoated stainless steel with excellent corrosion resistance for demanding environments.
Standard metric thread pitches apply: M1.2 (0.25mm), M1.6 (0.35mm), M2 (0.4mm), M4 (0.7mm), M5 (0.8mm), M6 (1.0mm). These are compatible with standard metric nuts and tapped holes of the same size.
'D=' refers to the head diameter of the countersunk screw. For example, M1.2 screws have a head diameter of 2.3mm, while M6 screws have a head diameter of 11.3mm. This is important when sizing your countersunk hole.
Yes. The small sizes (M1.2, M1.6, M2) are commonly used in electronics, optical instruments, watches, and precision devices where a flush-mount fastener is required. The tolerance range is ±0.2mm.
The dimensional tolerance range is ±0.2mm, which is standard for non-standard metric machine screws of this type.
Each variant is sold separately by thread size, coating, and quantity. To get multiple sizes or finishes, simply add each desired variant to your cart individually.
