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Whether you're assembling electronics enclosures, building out a DIY project, or stocking a workshop, running out of the right-sized screw mid-job is a real frustration. Makers, hobbyists, and maintenance professionals who work across multiple thread sizes need a dependable supply of black Phillips pan head machine screws that covers the full range without ordering from a dozen different listings.
This listing offers black zinc-plated steel Phillips pan head machine screws in thread diameters from M2 through M6, with shaft lengths (not including the head) ranging from 3mm (≈1/8") up to 50mm (≈2"). Each variant is sold in pack quantities of 5, 10, 20, 25, 50, 100, 250, or 500 pieces depending on the size selected. The pan head profile provides a low-profile, wide-bearing surface, while the truss-style head on select sizes offers an even broader footprint for thin or soft materials.
Typical use cases include securing PCB boards and electronics housings with M2–M3 black machine screws, fastening sheet metal panels and brackets with M4–M5 screws, and general-purpose metric fastening in furniture, appliances, and machinery with M5–M6 pan head bolts. The black zinc finish blends cleanly into dark assemblies and anodized aluminum frames.
| Thread Standard | ISO Metric Coarse (DIN 7985 / similar) |
|---|---|
| Thread Diameters Available | M2, M2.5, M3, M4, M5, M6 |
| Shaft Lengths Available | 3mm–50mm (≈1/8"–2") — see variant options; length excludes head height |
| Head Type | Pan Head (low-profile, wide bearing surface) |
| Drive Type | Phillips (Cross) — PH0 / PH1 / PH2 depending on size |
| Material | Carbon Steel |
| Finish / Coating | Black Zinc Electroplating |
| Corrosion Resistance | Moderate — suitable for indoor and light-duty use |
| Pack Quantities | 5, 10, 20, 25, 50, 100, 250, 500 pcs (varies by size) |
| Country of Origin | See variant options / Contact us to confirm |
| Certifications / Standards | Contact us to confirm |
Match the thread diameter to your tapped hole or nut size (e.g., M3 for a 3mm threaded hole). For length, the screw should typically penetrate the receiving material by at least 1.5× the thread diameter. For example, an M3 screw fastening 3mm of material generally needs at least 4–5mm of thread engagement beyond the surface. Note: the listed length does not include the head height.
Divide the millimeter value by 25.4 to get inches. Quick reference: 6mm ≈ 0.236" (≈15/64"), 10mm ≈ 0.394" (≈25/64"), 25mm ≈ 0.984" (≈1"), 50mm ≈ 1.969" (≈2"). Remember the listed length does not include the head.
These are generally manufactured to a property class 4.8 equivalent for carbon steel machine screws. Exact tensile strength varies by diameter and length. For structural or high-load applications, please contact us to confirm specifications before ordering.
The black zinc plating provides moderate corrosion resistance for indoor and light-duty applications. For prolonged outdoor exposure or high-humidity environments, additional sealing or a stainless steel alternative is generally recommended. In most cases, these are not rated for continuous outdoor immersion.
These screws follow the ISO metric coarse thread standard (e.g., M3 = 3mm nominal diameter with 0.5mm pitch). They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF inch-standard fasteners.
The recommended bit size is typically PH0 for M2–M2.5, PH1 for M3–M4, and PH2 for M5–M6. Using the correct bit size helps prevent cam-out and head damage. Always apply firm, straight pressure when driving to avoid stripping the recess.
Yes. The smaller sizes (M2, M2.5, M3) are commonly used in electronics enclosures, PCB standoffs, and device assembly. The black zinc finish is generally non-conductive on the surface oxide layer, but confirm your application's electrical isolation requirements before use.
If you need screws for a single repair or prototype, a pack of 10–20 is typically sufficient. For production runs, workshop stocking, or recurring maintenance tasks, ordering 100–500 pieces generally offers a lower per-unit cost and reduces reorder frequency. Check the price-per-piece across pack sizes before selecting.
