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Standard screws invite tampering. Whether you’re securing electronics enclosures, public fixtures, display hardware, or anti-theft installations, a fastener that can’t be removed with a common screwdriver is a meaningful deterrent. These black A2 stainless steel button head Security Torx machine screws use a pin-in Torx (TR) drive that requires a specialized Security Torx driver — standard Torx bits will not engage. The black oxide finish reduces visibility in dark assemblies and provides corrosion resistance.
The button head profile delivers a low-profile, dome-shaped head with a wider bearing surface than a standard socket cap — clean in appearance and less likely to snag. Available in M2 through M6 with 61 size combinations from M2×3mm (0.12”) to M6×50mm (1.97”). Pack sizes of 5, 10, 20, and 50 pieces let you order exactly what you need.
Typical applications include electronics enclosure and device security (M2–M3), public fixture and display hardware (M4–M5), anti-theft installations and access panels (M4–M6), kiosk and vending machine assembly, and any application where unauthorized removal of fasteners must be prevented.
| Material | A2 Stainless Steel (304 / 18-8) |
|---|---|
| Finish | Black oxide (corrosion-resistant) |
| Thread Standard | ISO Metric |
| Thread Diameters | M2, M2.5, M3, M4, M5, M6 |
| Head Style | Button Head (low-profile dome) |
| Drive Type | Security Torx (TR / pin-in Torx) — TR6 / TR8 / TR10 / TR15 / TR20 / TR25 |
| Length Range | 3mm (0.12”) to 50mm (1.97”) — varies by diameter |
| Total Size Combinations | 61 variants (see Size selector for full list) |
| Pack Sizes | 5 / 10 / 20 / 50 pcs (varies by size) |
| Screw Type | Machine screw (requires tapped hole or nut) |
| Length Measurement | Excluding head (shaft length only) |
| Corrosion Resistance | Excellent — suitable for indoor and light outdoor use |
| Common Applications | Electronics enclosures, public fixtures, display hardware, anti-theft installations, kiosks, and access panels |
A Security Torx screw (also called Torx TR, Tamper-Resistant Torx, or pin-in Torx) has a standard 6-point star drive with a center pin that prevents standard Torx drivers from engaging. A matching Security Torx (TR) driver with a center hole is required to drive or remove these screws. This makes them a practical deterrent against unauthorized removal.
A Security Torx (TR) driver with a center hole is required. Standard Torx (T) drivers will not fit due to the center pin. Typical driver sizes: M2 = TR6, M2.5 = TR8, M3 = TR10, M4 = TR15, M5 = TR20, M6 = TR25. Always verify the correct TR size for your specific screw before purchasing a driver.
A button head screw has a low-profile, dome-shaped head that is wider than a socket cap head but lower in profile. It provides a larger bearing surface and a cleaner, more finished appearance in visible assemblies. The rounded dome is less likely to snag on surrounding surfaces compared to a hex socket cap.
A2 is the most common grade of austenitic stainless steel, equivalent to 304 or 18-8 stainless. It offers excellent corrosion resistance, is non-magnetic in most conditions, and is the standard material for general-purpose stainless fasteners in electronics, fixtures, and light outdoor use.
A2 stainless steel provides strong corrosion resistance and will not rust under normal indoor conditions or light outdoor exposure. For marine, coastal, or highly corrosive environments, A4 (316) stainless is generally recommended. These screws are well-suited for electronics, public fixtures, and sheltered outdoor installations.
Measure the depth of the tapped hole or the thickness of the material being fastened. The screw length (excluding head) should engage at least 1.5× the thread diameter for a secure hold. Available lengths vary by diameter — check the Size selector for the full list. When in doubt, size up.
Yes — these are machine screws, not self-tapping. They require a pre-tapped M-series hole or a matching metric nut in the same thread size. They will not cut their own thread into plastic or metal.
Available in packs of 5, 10, 20, and 50 pieces depending on the thread size selected. Larger packs offer better per-unit value for workshops and production installations. Select your preferred quantity using the Qty option above.
