Lead Seal Screws: The Tiny Guardians of Security

In an increasingly security-conscious world, a small but mighty fastener plays a critical role: the **Lead Seal Screw**. Combining mechanical fastening with visible tamper-evidence, these specialized screws are indispensable across industries where preventing unauthorized access is paramount.

Core Function: Tamper-Proofing & Verification  
Unlike standard screws, a lead seal screw features a unique design. Once installed, a soft lead seal wire or ball is inserted into a dedicated cavity in the screw head. Using specialized **lead seal pliers**, the seal is then crimped and compressed , permanently locking it in place and deforming it into a unique, often imprinted shape. 

Tamper-Evident:

Any attempt to remove the screw requires destroying or significantly damaging the lead seal.

Visual Verification:

The intact, uniquely compressed seal provides immediate visual proof that the secured item has not been accessed.  
Unique Identification:

Seals often bear serial numbers, logos, or custom imprints for tracking and authentication. 

Key Application Scenarios

1.  **Utility Metering: **  
    *   **Electricity Meters, Gas Meters, Water Meters:** Sealing meter covers prevents tampering and ensures accurate billing. A broken seal flags potential fraud or unauthorized access.  
    *   *Chinese Context:* Mandatory for utility companies nationwide to secure meters and junction boxes.  

2.  **Transportation & Logistics:**  
    *   **Shipping Containers, Trucks Trailers, Air Cargo:** Sealing doors and hatches guarantees cargo integrity throughout its journey. Customs authorities rely on intact seals for clearance.  
    *   *Chinese Context:* Essential for export/import compliance and domestic high-value cargo security.  

3.  **Critical Infrastructure & Equipment:**  
    *   **Electrical Cabinets, Control Panels, Telecom Boxes, Machinery Access Panels:** Prevents unauthorized access to sensitive or dangerous components, ensuring operational safety and preventing sabotage.  

4.  **Regulatory Compliance & Safety Devices:**  
    *   **Fire Extinguishers, Safety Valves, Medical Equipment, Weighing Scales:** Seals verify that safety-critical devices haven't been tampered with and remain within calibration or certification periods. Often required by law or industry standards.  

5.  **Retail Security & Asset Protection:**  
    *   **Display Cases, ATM Machines, Vending Machines, High-Value Goods Packaging:** Deters theft and provides evidence if tampering occurs.