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When a protruding screw head is not an option — whether you're assembling electronics, mounting panels, or building compact mechanical devices — a Phillips countersunk machine screw is the go-to solution. Hobbyists, electronics technicians, and workshop professionals who work with tight tolerances know that the wrong fastener can ruin a clean build. These M2, M2.5, and M2.6 flat-head machine screws are designed to sit flush with or below the surface, keeping your assemblies neat and snag-free.
Each set is available in thread diameters of M2, M2.5, and M2.6, with overall lengths ranging from 3mm (≈1/8") to 19.3mm (≈3/4"). Head diameters range from 3mm to 5.2mm depending on the variant. The base material is carbon steel, with a wide selection of surface finishes including Bright Nickel, Black Zinc, Stainless Steel, Zinc-Nickel Black, White Zinc, and specialty options such as half-threaded and pre-applied blue thread-locking compound. Packs are available in 100, 200, or 500 pieces to suit both prototyping and production runs.
Typical applications include securing PCB standoffs and covers in consumer electronics, fastening thin sheet metal panels in enclosures, assembling small appliances and RC model components, and any precision mechanical build where a flush surface finish is required. The ISO metric thread profile ensures compatibility with standard metric tapped holes and threaded inserts across a wide range of materials.
| Head Type | Phillips Countersunk (Flat Head), 90° included angle |
|---|---|
| Drive Type | Phillips (Cross Recess) |
| Thread Standard | ISO Metric (M2, M2.5, M2.6) |
| Thread Diameter | M2 / M2.5 / M2.6 — see variant options |
| Overall Length | 3mm (≈1/8") to 19.3mm (≈3/4") — see variant options |
| Head Diameter | 3mm to 5.2mm depending on variant — see variant options |
| Base Material | Carbon Steel |
| Surface Finish / Type | Bright Nickel / Black Zinc / Stainless Steel / Zinc-Nickel Black / White Zinc / Stainless Steel (Half-Threaded) / White Zinc (Half-Threaded) / Bright Nickel with Blue Thread-Lock Glue — see variant options |
| Thread Form | Fully threaded (standard) or half-threaded — see variant options |
| Quantity per Pack | 100 Pcs / 200 Pcs / 500 Pcs — see variant options |
| Recommended Driver Bit | Phillips #0 (for M2) or Phillips #1 (for M2.5–M2.6) — confirm with your tool set |
| Typical Applications | Electronics assembly, PCB mounting, panel fastening, small appliances, RC models, precision mechanical assemblies |
For countersunk (flat head) screws, the listed length is the total length including the head. As a general rule, choose a length that allows the head to sit flush with or just below the surface. For example, if your material is 3mm thick and you need the screw to pass through it, a 4–5mm screw typically works well. Always verify the thread engagement depth in the receiving material — generally at least 1.5× the thread diameter is recommended for reliable holding strength.
Quick reference: 3mm ≈ 1/8", 5mm ≈ 3/16", 8mm ≈ 5/16", 10mm ≈ 3/8", 16mm ≈ 5/8", 19.3mm ≈ 3/4".
Load capacity depends on the material, finish, and installation conditions. Carbon steel screws in this size range are generally suited for light-duty fastening in electronics, small appliances, and precision assemblies. For structural or high-vibration applications, the Stainless Steel variants are typically recommended. Contact us to confirm specific tensile or shear ratings for your use case.
The base material is carbon steel, which is not inherently rust-resistant. For outdoor or humid environments, we recommend choosing the Stainless Steel or Zinc-Nickel Black finish variants, which offer significantly better corrosion resistance. Bright Nickel and Black Zinc finishes provide moderate protection for indoor use. White Zinc is generally suitable for mild indoor conditions.
These screws follow the ISO metric thread standard (M2, M2.5, M2.6). They are compatible with standard metric nuts, threaded inserts, and tapped holes machined to ISO 68-1 specifications. They are not compatible with UNC/UNF inch-standard threads. If you are unsure whether your existing hardware is metric or inch, check the thread pitch with a thread gauge before ordering.
Fully threaded screws have threads running the entire length of the shank, providing maximum grip in soft or thin materials. Half-threaded (partial thread) screws have a smooth shank section near the head, which allows the clamped material to pull tight against the base — useful when joining two separate pieces where you want clamping force rather than thread engagement in the top layer. Half-threaded variants are available in Stainless Steel and White Zinc finishes in this listing.
The "Bright Nickel / With Blue Glue" variant features a pre-applied thread-locking adhesive (typically a medium-strength anaerobic compound similar to Loctite 243). This helps prevent loosening from vibration without requiring a separate application of thread locker. It is generally suitable for assemblies subject to moderate vibration. Note that once cured, removal typically requires standard hand tools; heat may be needed for disassembly in some cases.
For electronics and PCB work, Bright Nickel is typically the most popular choice due to its clean appearance, good conductivity, and resistance to mild oxidation. Black Zinc is a good option when a low-profile, non-reflective finish is preferred. Avoid finishes with thread-locking compounds if you anticipate frequent disassembly. For medical or food-adjacent electronics, Stainless Steel is generally the safer choice.
For M2 screws, a Phillips #0 bit is typically the correct fit. For M2.5 and M2.6 screws, a Phillips #1 bit is generally recommended. Using an incorrect bit size can strip the recess, so always test fit before applying torque. If you are unsure, start with a #0 and check for play before switching to a #1.
