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Finding the right black machine screw in a US thread size — without ordering a mixed bag of sizes you’ll never use — is harder than it should be. These black Pozi and Phillips pan head machine screws cover the full range of common UNC and UNF sizes from #2-56 to 5/16-18, in lengths from 3/16” (4.8mm) to 2-1/2” (63.5mm), with flexible pack sizes from 10 to 250 pieces. Order exactly the size and quantity you need.
Each screw features a black oxide or black zinc finish for corrosion resistance and a clean, low-profile appearance. The pan head profile provides a wide, flat bearing surface that distributes clamping force without digging into panels or housings. The Pozi (Pozidriv) drive delivers better torque transfer and reduced cam-out compared to standard Phillips — a meaningful advantage when working in tight spaces or with power tools. Thread sizes span the most common US standards: #2-56 UNC, #4-40 UNC, #6-32 UNC, #8-32 UNC, #10-24 UNC, #10-32 UNF, 1/4-20 UNC, and 5/16-18 UNC.
Typical applications include PC case assembly and motherboard standoffs (#6-32, #8-32), electronics enclosures and panel mounting (#4-40, #6-32), general-purpose DIY and workshop projects (#8-32 through 5/16-18), and replacement fasteners for appliances, furniture, and equipment using standard US thread sizes.
| Material | Steel with black oxide or black zinc finish |
|---|---|
| Finish | Black (corrosion-resistant coating) |
| Thread Standard | Unified Thread Standard (UNC / UNF) |
| Thread Sizes | #2-56 UNC, #4-40 UNC, #6-32 UNC, #8-32 UNC, #10-24 UNC, #10-32 UNF, 1/4-20 UNC, 5/16-18 UNC |
| Head Style | Pan Head (Round Head) |
| Drive Type | Pozi (Pozidriv) / Phillips — PH1/PZ1 for #2–#6; PH2/PZ2 for #8–5/16 |
| Available Lengths | 3/16” (4.8mm), 1/4” (6.4mm), 5/16” (7.9mm), 3/8” (9.5mm), 1/2” (12.7mm), 5/8” (15.9mm), 3/4” (19.1mm), 7/8” (22.2mm), 1” (25.4mm), 1-1/8” (28.6mm), 1-1/4” (31.8mm), 1-1/2” (38.1mm), 1-3/4” (44.5mm), 2” (50.8mm), 2-1/2” (63.5mm) |
| Pack Sizes | 10 / 20 / 50 / 100 / 250 pcs (varies by size) |
| Screw Type | Machine screw (requires tapped hole or nut) |
| Length Measurement | Excluding head (shaft length only) |
| Common Applications | PC case assembly, electronics enclosures, panel mounting, general DIY, appliance repair |
Measure the depth of the tapped hole or the thickness of the material being fastened. The engaged thread length should be at least 1× the screw diameter for metal and 2× for plastic. Available lengths run from 3/16” (4.8mm) to 2-1/2” (63.5mm). When in doubt, size up — a slightly longer screw is easier to work with than one that’s too short.
UNC (Unified National Coarse) has fewer threads per inch and is the standard for most general-purpose fastening. UNF (Unified National Fine) has more threads per inch, providing finer adjustment and stronger clamping in thin materials. The #10-32 variant in this listing uses UNF; all other sizes are UNC. Always match the thread type to your tapped hole or nut.
The screws feature a black oxide or black zinc coating that provides corrosion resistance, reduces light reflection, and gives a clean appearance for visible assemblies. This finish is commonly used in electronics builds, PC cases, and dark-panel enclosures where a silver screw head would stand out.
These screws use a Pozi (Pozidriv) or Phillips drive. For smaller sizes (#2–#6), use PH1 or PZ1; for larger sizes (#8–5/16), use PH2 or PZ2. A Pozi driver is recommended for better torque transfer and reduced cam-out, especially when using a power driver. Standard Phillips drivers will also work.
Yes. All sizes follow Unified Thread Standard (UTS) specifications and are compatible with standard US tapped holes, nuts, and threaded inserts in the same size and thread pitch. Common pairings: #6-32 for PC cases, #8-32 for general electronics, 1/4-20 for camera mounts and heavier fixtures.
Yes — these are machine screws, not self-tapping. They require a pre-tapped hole or a matching nut in the same thread size and pitch. They will not cut their own thread into plastic or metal.
Strength varies by size and material grade. These screws are generally suitable for light-to-medium clamping loads in electronics, enclosures, and general DIY. They are not rated for structural or high-load applications. For critical load-bearing use, consult the manufacturer’s torque specifications for the specific size.
Available in packs of 10, 20, 50, 100, and 250 pieces depending on the thread size selected. Larger packs offer better per-unit value for workshops, repair shops, and production use. Select your preferred quantity using the Amount option above.
