As a high-security protective device, the single stainless steel vault door middle door integrates multiple physical barriers with intelligent technology to form a three-dimensional protection system. Its core design revolves around the door material, locking system, anti-vandalism structure, and emergency protection mechanism, ensuring the integrity of the protection even under extreme violent impacts.
The door material is fundamental to its anti-vandalism capabilities. Single stainless steel vault doors middle doors typically employ a multi-layered composite structure. The outer layer is made of high-strength stainless steel, possessing excellent impact and cut resistance. The inner layer is filled with drill-resistant alloy steel plates or composite fire-resistant materials, which can resist damage from tools such as electric drills and oxy-acetylene torches, and also slow the spread of fire through flame-retardant properties. Some high-end products also embed Kevlar or carbon fiber reinforcement layers inside the door to further enhance tear resistance. This material combination allows the door to dissipate attack energy through multiple layers of barrier against violent attacks.
The design of the locking system is crucial for preventing forced entry. Single stainless steel vault doors and middle doors typically employ a multi-point locking mechanism. Multiple solid stainless steel bolts are distributed around the door leaf, with bolt diameters usually exceeding 30 mm and an effective locking depth of at least 35 mm. When the door is closed, the bolts simultaneously engage with reinforced keyholes in the door frame, forming a "four-sided locking" structure. This design evenly distributes stress on the door, preventing single-point damage from causing overall failure. Simultaneously, the lock body uses a UL-certified mechanical combination lock with hundreds of millions of possible combinations and an automatic scrambling function. If the combination dial is not turned or has not turned three times after closing, the system automatically scrambles the combination at least four times, completely eliminating the possibility of technical opening.
The anti-vandalism structure enhances protective effectiveness through detailed design. The gap between the door frame and the door leaf is strictly controlled to within 1 mm, and the surface flatness error does not exceed 2 mm, eliminating the space for tool insertion and prying. The hinges utilize heavy-duty stainless steel hinges with a diameter of up to 180 mm and are equipped with lightweight drive bearings. These not only withstand the weight of the door to prevent sagging and deformation but also ensure smooth, unobstructed opening up to 180 degrees. The door edges are wrapped with 1.2 mm thick SUS304 stainless steel decorative panels, enhancing aesthetics and preventing edge deformation from violent impacts. Some products also feature an internal "alloy block" reinforcement layer to withstand high-temperature damage from welding, oxy-acetylene torch cutting, and other methods.
An emergency protection mechanism serves as the last line of defense against forced entry. Single stainless steel vault doors and middle doors typically feature a safety relocking device. When the door is subjected to violent damage such as gas cutting or drilling, the built-in relocking sensor triggers the deadbolt system, automatically locking the latch. Even if the locking mechanism is completely destroyed, the door cannot be opened. Additionally, optional features include a time lock and an emergency call button. The time lock can only be opened after a preset time, while the emergency call button automatically sounds an alarm and notifies security personnel upon damage. These devices employ both physical and electronic protection to minimize the time required for forced entry.
The integration of smart technology further enhances the anti-forced entry capabilities. Some high-end products support biometric technologies such as fingerprint, iris, and facial recognition, and utilize an "N+1" multi-lock linkage design, requiring simultaneous verification by multiple people to open the door, completely eliminating the possibility of a single person forcibly entering. Vibration and pressure sensors are also integrated inside the door; when abnormal vibration or impact is detected, an automatic alarm system is immediately activated, and the alarm is uploaded to the monitoring center via network connectivity.
The anti-forced entry structure of the single stainless steel vault door middle door utilizes reinforced materials, upgraded locking systems, optimized anti-vandalism details, and the integration of smart technology to construct a comprehensive protection system from physical barriers to intelligent early warning. This design not only meets the national Class C security standard but also satisfies the stringent requirements of high-security locations such as banks, museums, and artifact storage facilities, providing reliable protection for valuable assets.
