Cap Head Torx Pin Security Screws Black Oxide Tamper Proof Fasteners
Product Specifications
| Parameter | Standard Range |
|---|---|
| Head Type | Cap Head (Cylindrical) |
| Drive Type | Torx with Center Pin (Tamper Proof) |
| Thread Type | Metric Machine Thread (6G tolerance) |
| Available Diameters | M2 / M2.5 / M3 / M4 / M5 / M6 / M8 |
| Available Lengths | 4mm – 50mm (custom lengths supported) |
| Standard Materials | Carbon Steel (Class 8.8 / 10.9), SUS304, SUS316 |
| Surface Finishes | Black Oxide, Zinc Plated, Passivation, Nickel Plated |
| Hardness (Carbon Steel) | 22HRC – 34HRC (Class 8.8) |
| Salt Spray (SUS316 Passivation) | ≥ 500 hours |
| MOQ (Standard Sizes) | 1,000 pcs |
| MOQ (Custom Sizes) | 500 pcs (prototype batch) |
Key Features & Benefits
Material & Finish Selection Matrix
| Working Environment | Recommended Material | Recommended Finish | Rationale |
|---|---|---|---|
| Indoor machinery, control cabinets | Carbon Steel 8.8 | Black Oxide | Cost-effective, wear-resistant matte finish |
| General outdoor, urban facilities | SUS304 | Passivation | Balanced corrosion resistance, moderate budget |
| Coastal, marine, high humidity | SUS316 | Passivation | Superior chloride resistance, long service life |
| High vibration automation lines | Carbon Steel 10.9 | Black Oxide + Wax Seal | Higher tensile strength, anti-loosening under vibration |
| Decorative / visible assembly | SUS304 | Nickel Plated | Bright aesthetic finish, moderate corrosion protection |
Drive & Tooling Compatibility
Installation and removal require a matching security torx bit with hollow center (also called torx pin bit or tamper-proof torx bit). Standard solid-center torx bits will not fit due to the center pin obstruction. Recommended bit sizes correspond to drive diameter: T10 for M2–M2.5, T15 for M3, T20 for M4, T25 for M5, T30 for M6–M8. We recommend using a calibrated torque screwdriver for volume assembly to prevent over-tightening and drive stripping. Matching security bits can be supplied with bulk orders upon request.
Application Industries
These security screws are widely specified across industries where anti-disassembly is a design requirement:
- •Industrial Automation: factory production line enclosures, robotic equipment housings
- •Public Infrastructure: traffic signal cabinets, charging pile shells, bus stop fixtures
- •Commercial Equipment: vending machines, self-service kiosks, ATM panels
- •Electronics & Telecom: outdoor communication cabinets, monitoring device housings
- •Energy & Utilities: solar panel frames, electrical distribution boxes
- •Transportation: railway station fixtures, shared mobility device assemblies
OEM Customization Options
Beyond standard catalog specifications, YH Fastener supports the following customizations:
- •Non-standard thread lengths and partial thread configurations
- •Modified head height or head diameter for special clearance requirements
- •Alternative drive sizes within the torx pin security family
- •Custom surface treatments including Dacromet, Geomet, or PTFE coating
- •Custom packaging: labeled bags, bulk cartons, or blister packs
- •Laser marking on screw head for brand identification or traceability
Quality Control & Certification
Every production batch follows a four-stage inspection process: incoming material composition verification → in-process dimensional sampling → thread gauge go/no-go testing → finish appearance and salt spray validation. Material certificates (EN 10204 3.1 type) and third-party inspection reports (SGS / BV) are available upon request.
Packaging & Lead Time
Standard orders are packaged in poly bags inside export cartons with detailed labeling. Lead time: standard stock sizes 3–5 business days; custom non-standard sizes 10–15 business days depending on quantity and specification complexity.
