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When a standard zinc or steel screw just won't cut it — because you need conductivity, corrosion resistance, or a clean flush finish — copper countersunk machine screws are the professional's choice. Whether you're assembling electronics enclosures, mounting PCBs, building RC models, or finishing cabinetry, the wrong fastener wastes time and mars surfaces. These copper machine screws are designed to disappear into the material and hold firm.
This listing covers the full M2–M6 metric range in both Phillips (PH) and Pozi (PZ) cross-head drive styles, with a 90° countersunk head that sits perfectly flush. Machined from solid copper, each screw offers natural corrosion resistance and electrical conductivity. Available lengths run from 4mm (5/32") up to 40mm (1-9/16") depending on the thread diameter, with pack sizes of 10, 20, 50, or 100 pieces to match your project scale.
Typical applications include PCB and SBC mounting (M2–M3 copper countersunk screws for Raspberry Pi and Arduino builds), precision hobby and RC assembly, electronics enclosure fabrication, and light woodworking or cabinetry where a flush copper fastener is specified. The Pozi drive variant is especially popular for power-tool use where cam-out resistance matters.
| Material | Solid copper |
|---|---|
| Thread Standard | ISO metric (M2, M2.5, M3, M4, M5, M6) |
| Head Style | Countersunk (CSK), 90° included angle |
| Drive Type | Phillips (PH) / Pozi (PZ) cross-head |
| Available Thread Diameters | M2, M2.5, M3, M4, M5, M6 |
| Available Lengths | 4mm (5/32") – 40mm (1-9/16") — range varies by diameter; see variant options |
| Pack Sizes | 10 pcs, 20 pcs, 50 pcs, 100 pcs |
| Finish | Bare copper (natural patina may develop over time) |
| Corrosion Resistance | Good — suitable for humid and mildly corrosive environments |
| Electrical Conductivity | Yes — solid copper, uncoated |
| Compatible Fasteners | Standard metric nuts and threaded inserts (M2–M6) |
| Country of Origin | See variant options / Contact us to confirm |
A general rule is to choose a length that allows at least two-thirds of the screw to engage the base material. For example, if joining two 3mm panels, a 6mm (about 1/4") screw is typically sufficient. For thicker stock, step up accordingly. Available lengths in this listing range from 4mm (5/32") to 40mm (1-9/16") depending on the thread diameter selected.
These screws feature a Phillips (PH) / Pozi (PZ) cross-head drive. Pozi drive is generally more cam-out resistant than standard Phillips, making it a preferred choice for power-tool use. A standard PH or PZ screwdriver or bit in the matching size (PH1/PZ1 for M2–M3, PH2/PZ2 for M4–M6) is recommended.
Copper machine screws are generally used in light-duty and precision applications rather than heavy structural loads. They offer good tensile strength for their size but are softer than stainless steel or carbon steel equivalents. They are well-suited for electronics, hobby builds, and cabinetry where corrosion resistance and conductivity matter more than maximum shear strength.
Yes. Copper is naturally corrosion-resistant and performs well in humid or mildly corrosive environments. Over time, copper may develop a patina (greenish oxidation), which is cosmetic and does not compromise the screw's structural integrity. For fully submerged or marine applications, additional sealing or protection may be advisable.
These screws follow the ISO metric thread standard (M2, M2.5, M3, M4, M5, M6). They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF (imperial) threads.
M2 and M2.5 are the most commonly used sizes for PCB standoffs and small electronics enclosures. M3 is a versatile mid-range size used in SBCs (such as Raspberry Pi and Arduino), camera mounts, and general electronics hardware. Select the length based on your standoff height or panel thickness — typically 4mm–8mm for most PCB applications.
Pack sizes are selectable at checkout: 10, 20, 50, or 100 pieces per order. Larger packs offer a lower per-unit cost and are ideal for workshop stock or bulk project use. Select your preferred quantity in the Amount variant option above.
Yes. These are solid, uncoated copper screws, which means they maintain a reliable electrical path. They are commonly used in grounding connections, bus bar assemblies, and conductive enclosure builds. Always verify your specific application's electrical requirements with a qualified engineer before use in safety-critical circuits.
