BT screws refer to a type of screw that is used in the manufacturing of electronic devices, such as mobile phones, laptops, and tablets. BT stands for "British Telecom," which originally developed this type of screw for use in their own products. BT screws have a unique design that makes them difficult to remove without the proper tool, which helps to prevent tampering and unauthorized access to sensitive electronic components. They have a small, six-pointed star-shaped head, which is also known as a Torx or star bit.

BT screws are available in a range of sizes, typically denoted by a T followed by a number. The most common sizes used in electronic devices are T5, T6, T7, and T8. In addition to their use in electronics, BT screws are also used in automotive and aerospace applications. When working with BT screws, it is important to use the correct size and type of driver or bit to avoid damaging the screw head. Using the wrong size or type of driver can result in stripped or damaged screw heads, which can be difficult to remove and may require specialized tools or techniques. Because BT screws are designed to be difficult to remove, they are often used in applications where security is a concern. It is important to take appropriate measures to prevent unauthorized access to electronic devices that use BT screws, such as using tamper-evident seals or security screws.