Tamper screw is a type of security fastener with an unconventional drive that makes it virtually impossible to remove without the corresponding tamper proof bit or driver. They are used in a variety of applications and industries where tampering or vandalism is a concern.
The most common type of tamper proof screw is the one-way screw, which installs using a standard flat-blade driver and is difficult or completely impossible to remove. Another common tamper proof fastener is the drilled spanner head or twin hole security screw, which uses two small holes drilled in the fastener head.

There are also tamper proof Torx screws with a post within the center of the fastener head that prevents conventional Torx drivers from working in it. These screws offer maximum security and are often used in high-security applications like banking machines or data centers where sensitive information needs to be protected from tampering.
Hex-pin style Security Screws are another popular tamper resistant fastener. They have an internal pin within the hexagonal socket of their head, which requires a special insert bit or key wrench to be inserted and removed.
Tamper proof fasteners are widely used by hospitals and medical equipment manufacturers to deter unauthorized access to sensitive devices, including fuel supplies and electrical components. They are also commonly found in correctional facilities to help prevent tampering that could lead to costly damage.