Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a stripped Phillips head or a protruding screw ruins hours of careful assembly work, you need a fastener you can actually rely on. Whether you're a maker building a 3D-printed enclosure, a technician reassembling precision equipment, or a DIYer finishing furniture hardware, these Torx countersunk head screws deliver the flush, secure fit that standard drives simply can't match.
Each order includes your selected quantity (10, 20, 50, or 100 pieces) of A2 stainless steel machine screws with a flat 90° countersunk head and a Torx (star) drive recess. Available in thread diameters M2, M2.5, M3, and M4, with lengths ranging from 4mm (≈5/32") to 20mm (≈25/32"). The metric coarse thread follows ISO 68-1 standards, making these screws compatible with standard tapped holes, threaded inserts, and metric nuts.
Typical use cases include securing PCB standoffs and electronics enclosure panels, assembling CNC-machined or 3D-printed parts where a flush surface is required, and fastening furniture hardware or cabinet fittings where a clean, tamper-resistant finish matters. The Torx drive also makes these a go-to choice for small engine covers, appliance panels, and precision instrument housings.
| Material | A2 Stainless Steel (ISO 3506, 304-equivalent) |
|---|---|
| Head Type | Flat Countersunk, 90° included angle |
| Drive Type | Torx (T-star / 6-point star recess) |
| Thread Standard | ISO 68-1 Metric Coarse |
| Thread Diameters | M2, M2.5, M3, M4 |
| Thread Pitch | M2: 0.4mm | M2.5: 0.45mm | M3: 0.5mm | M4: 0.7mm |
| Available Lengths | 4mm (≈5/32"), 5mm (≈3/16"), 6mm (≈1/4"), 8mm (≈5/16"), 10mm (≈3/8"), 12mm (≈15/32"), 14mm (≈9/16"), 16mm (≈5/8"), 20mm (≈25/32") |
| Torx Bit Size (typical) | M2: T6 | M2.5: T8 | M3: T10 | M4: T20 — confirm before ordering |
| Finish | Natural stainless (no coating) |
| Pack Quantities | 10 pcs, 20 pcs, 50 pcs, 100 pcs |
| Country of Origin | See variant options |
| Certifications / Standards | Contact us to confirm |
A general rule is to select a length that allows the screw to penetrate the base material by at least 1.5× the thread diameter. For example, an M3 screw fastening a 3mm panel into aluminum would typically need at least 6–8mm of total length. Always account for the countersink depth so the head sits flush. Available lengths in this listing range from 4mm (≈5/32") to 20mm (≈25/32").
A2 stainless steel (ISO 3506 property class 70) generally provides a tensile strength of approximately 700 MPa. These screws are suitable for light-to-medium structural fastening in electronics enclosures, machinery panels, and furniture hardware. For heavy structural loads, consult an engineer and verify the specific grade.
A2 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in mild environments, including exposure to rain and humidity. It is not recommended for prolonged immersion in saltwater or highly chlorinated environments — A4 (marine-grade) stainless would be more appropriate for those conditions.
These are metric machine screws following the ISO 68-1 thread standard (coarse pitch). M2 typically has a 0.4mm pitch, M2.5 a 0.45mm pitch, M3 a 0.5mm pitch, and M4 a 0.7mm pitch. They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size.
The required Torx bit size generally corresponds to the screw diameter: M2 typically uses T6, M2.5 uses T8, M3 uses T10, and M4 uses T20. Please confirm the exact drive size with the product specifications or contact us if you need clarification before ordering.
Torx (star-drive) heads allow higher torque transfer with less cam-out compared to Phillips or slotted drives. This makes them especially useful in precision assembly, electronics, and applications where over-driving or stripping a small screw would be costly. The tamper-resistant design also deters unauthorized disassembly.
Yes, in most cases these metric machine screws are compatible with standard brass or stainless heat-set inserts, press-fit inserts, and threaded inserts of the matching M2, M2.5, M3, or M4 size. Always verify the insert's thread specification matches the screw pitch before assembly.
