Non-standard A4-80 Triple Security Cap Screws For Public Infrastructure Black Oxide Finish Hex Socket Guanbiao Hardware

A4-80 Triple Security Cap Screws/ Vandal Proof/ Public Infrastructure/ Hex Socket/ Batch Orders Guanbiao Hardware

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.

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.

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