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When a protruding screw head isn't an option — whether you're assembling electronics enclosures, mounting panels, or finishing cabinetry — a countersunk fastener makes all the difference. These Phillips flat head machine screws are built for builders, makers, and maintenance professionals who need a clean, flush finish without sacrificing holding strength.
Each screw features a flat countersunk head with a Phillips drive recess, machined to UNC (Unified National Coarse) thread standards. Available in five thread sizes — #2-56, #4-40, #6-32, #8-32, and #10-24 — with lengths ranging from 3/16 in (≈4.8 mm) to 2 in (≈50.8 mm). Sold in packs of 10, 20, 30, 50, or 100 pieces to match your project scale. Material is A2 304 stainless steel throughout.
Typical applications include electronics chassis assembly, appliance repair, HVAC panel fastening, and light-duty machine assembly where flush-mount Phillips flat head machine screws are required. The UNC thread makes them a drop-in fit for standard American tapped holes and threaded inserts.
| Drive Type | Phillips (Cross Recess) |
|---|---|
| Head Style | Flat / Countersunk (82° included angle, typically) |
| Thread Standard | UNC — Unified National Coarse |
| Available Thread Sizes | #2-56, #4-40, #6-32, #8-32, #10-24 |
| Available Lengths | 3/16 in (≈4.8 mm) to 2 in (≈50.8 mm) |
| Material | A2 304 Stainless Steel |
| Finish | Mill / Natural Stainless (no additional coating) |
| Corrosion Resistance | Good — suitable for indoor and general outdoor use |
| Packing Options | 10 pc / 20 pc / 30 pc / 50 pc / 100 pc |
| Compatible Fasteners | Standard UNC nuts, threaded inserts, tapped holes |
| Country of Origin | See variant options |
| Certifications / Standards | Contact us to confirm |
For countersunk flat head screws, the listed length is the total length including the head. Measure the full thickness of the material being fastened and select a length that allows the head to sit flush or just below the surface. For example, a 1/2 in (12.7 mm) screw is typically used in materials up to about 3/8 in thick when countersinking is applied. When in doubt, size up by one increment.
A2 304 stainless steel machine screws generally have a tensile strength of around 500–700 MPa depending on diameter and manufacturing tolerances. Actual load capacity depends on thread engagement depth, base material, and application. For structural or safety-critical assemblies, consult an engineer and verify with your specific requirements.
A2 304 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most environments. However, for highly corrosive coastal or marine environments, A4 316 stainless steel is typically recommended. These screws perform well in general outdoor, garden, and light-duty applications exposed to moisture.
These screws use UNC (Unified National Coarse) thread — the most common inch-based thread standard in the United States. They are compatible with standard UNC nuts, threaded inserts, and tapped holes of the corresponding size. For example, #10-24 screws pair with #10-24 nuts or tapped holes.
The number designation refers to the screw's outer diameter: #2 ≈ 0.086 in (2.2 mm), #4 ≈ 0.112 in (2.8 mm), #6 ≈ 0.138 in (3.5 mm), #8 ≈ 0.164 in (4.2 mm), #10 ≈ 0.190 in (4.8 mm). Smaller sizes (#2, #4) are typically used in electronics and precision assemblies; larger sizes (#8, #10) suit general hardware, cabinetry, and light structural work.
These screws have a Phillips (cross) drive head. Use a Phillips #1 bit for #2 and #4 screws, and a Phillips #2 bit for #6, #8, and #10 screws. Using the correct bit size reduces cam-out and protects the head recess during installation.
Machine screws are designed for use with pre-tapped holes, threaded inserts, or nuts — not for self-tapping into wood or plastic. They work well in aluminum, steel, and other metals with matching tapped holes. For plastic, a threaded insert is generally recommended to ensure reliable thread engagement.
