Anti-theft screws are specialized fasteners designed to prevent unauthorized removal or tampering. They come in various types, each serving different purposes and applications. Here's a brief overview of their classifications:

1. One-Way Screws: These screws have a unique design that allows them to be installed with a specific tool but cannot be removed in the traditional manner. The head may be shaped irregularly or include special features that render standard screwdrivers ineffective.

2. Tamper-Resistant Screws: As the name suggests, these screws are engineered to resist tampering attempts. They often feature complex head designs, such as Torx Plus, Spanner, or star patterns, which require specialized tools for installation and removal.

3. Security Bit Screws: These screws require the use of a specific security bit, often proprietary, to turn them. The bits are not commonly available, adding an extra layer of security against unauthorized access.

4. Bolt Security Systems: Beyond traditional screws, some anti-theft systems involve bolts with built-in locking mechanisms. These can include pin-tumbler locks, ball bearings, or other innovative designs that require a key or special tool for removal.

5. Self-Locking Screws: These screws incorporate internal threading or other mechanical features that create a locking action once tightened, making them less likely to loosen over time or under vibration.

Each type of anti-theft screw offers distinct advantages tailored to specific security needs, from protecting valuable equipment to safeguarding sensitive installations. Choosing the right one depends on the level of security required and the ease of access to specialized tools for legitimate use.