Dongguan Guanbiao Hardware Products Co., LTD
Dongguan Guanbiao Hardware Products Co., LTD Innovation is the foundation, quality is the life, pragmatism is the purpose, and efficiency is the goal. Customer satisfaction is our ultimate goal.
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Ultimate security A4 stainless steel cap head screws. Three-combination defense: tamper-resistant drive, permanent threadlocker & breakaway head. For utilities, transport & public fixtures. Passivated.
Protect critical infrastructure from vandalism and unauthorized access with our **High-Security Cap Head Hexagon Socket Three Combination Screws**. Engineered for maximum defense, these fasteners integrate **three independent security mechanisms**: 1) A **tamper-resistant pin-in-hex socket drive**, 2) A **permanent, high-strength pre-applied threadlocker**, and 3) A **breakaway/frangible hex head**. Made from corrosion-resistant A4 stainless steel, they provide an unparalleled permanent, vandal-proof solution for public utilities, transportation, and high-security enclosures.
TECHNICAL SPECIFICATIONS | |
| Material | A4 / 316 Stainless Steel (ISO 3506 Class 80 - **A4-80** for high strength) |
| Drive Type | Hexagon Socket (ISO 4762) **with Central Security Pin** (Tamper-Resistant TR) |
| Head Style | Cylindrical Head (DIN 912 / ISO 4762) |
| Thread Pitch | Metric Coarse (Standard) |
| Strength | Min. Tensile Strength: 800 MPa (A4-80) |
| Sizes | Common: M6, M8, M10, M12, M16 |
| Lengths | Standard & Custom (e.g., 20mm, 25mm, 30mm, 35mm, 40mm, 50mm |
Primary Uses & Applications:
* Utility boxes (electrical, telecom, gas, water).
* Public transportation fixtures (bus stops, rail trackside equipment).
* Traffic signal & control cabinet access panels.
* Bridge & tunnel infrastructure access points.
* Permanent security fencing & gate hardware.
* High-value asset protection (ATMs, vending machines - permanent installs).
Surface Treatment/Finishes:
* **Passivation (Standard):** Critical chemical process to maximize corrosion resistance by removing free iron and enriching the passive chromium oxide layer.
* **Electropolishing (Optional):** Enhances corrosion resistance, provides smoother surface (reduced friction during install), bright finish. Improves cleanability.
How to Use:
1. **Prepare:** Ensure female threads are clean, dry, and compatible (A4 nut/threaded hole recommended). Hole must accommodate full screw length *including* the breakaway head.
2. **Insert Screw:** Use the **specialized TR driver bit** (e.g., TR30 for M10) matching the screw size. Insert the screw into the hole.
3. **Tighten:** Apply torque using a calibrated torque wrench/driver. Tighten to the specified torque value for the size and material.
4. **Breakaway:** Once final torque is reached, **continue applying torque**. The specially designed **hex head will shear off cleanly** just below the top surface, leaving only a smooth, non-grippable cylindrical stud. *The screw is now permanently locked in place.*
5. **Removal:** **Extremely difficult and destructive.** Requires drilling out the screw remnant. Replacement requires re-tapping the hole.