What is the role of self-drilling screws?

1. Self-tapping screws are also mostly used for connection between thin metal plates. The thread is a common thread with an arc-shaped triangular cross-section. The thread surface also has high hardness. Therefore, when connecting, the screw can also be connected The internal thread is tapped in the bottom hole of the thread to form a connection. This kind of screw is characterized by low screwing torque and high locking performance, which has better working performance than ordinary self-tapping screws and can be used instead of machine screws;
2. Wallboard self-tapping screws are used for the connection between gypsum wallboards and metal keels. The threads are double-end threads, and the thread surface also has a high hardness (≥HRC53), which can be used without making prefabricated holes. Under, quickly screwed into the keel to form a connection;
3. The difference between self-drilling screws and ordinary self-tapping screws is that when ordinary self-tapping screws are connected, they have to go through two processes of drilling (drilling the bottom hole of the thread) and tapping (including fastening connection); When connecting, the two processes of drilling and tapping are combined at once. It first drills with the drill bit in front of the screw, and then taps with the screw (including fastening connection), saving construction time and improving construction efficiency;
4. Pan head and hexagon head self-tapping screws are suitable for occasions where the nail head is allowed to be exposed. Hexagon head self-tapping screws can withstand a larger torque than pan head self-tapping screws. Countersunk head and hexagonal hexagonal self-tapping screws are suitable for nail heads. Where exposed, hexagon socket-shaped self-tapping screws can withstand greater torque than countersunk head self-tapping screws; semi-counter-sunk head self-tapping screws are suitable for occasions where the nail head is slightly exposed. Slotted self-tapping The screws need to use a flat-blade screwdriver, the cross-slot self-tapping screws need to use a cross-shaped screwdriver, the hexagon socket-shaped self-tapping screws need to use an internal hexagon flower wrench, the hexagon head self-tapping screws need to use a spanner wrench, torx wrench, socket Spanner or adjustable wrench