Self-tapping lock screws are also used for connections between thin metal plates. The screw thread has a curved triangular cross-section of the ordinary thread, the thread surface also has a high hardness, so the connection, the screw can be connected to the threaded hole in the tapping out of the internal thread, to form a connection. The screw is characterized by low screw-in torque and high locking performance than ordinary tapping screws have better performance, and can replace the machine screws.
Wallboard self-tapping screws for gypsum wallboard and metal keel connection. The thread is double-headed thread, the thread surface also has a high hardness (≥ HRC53), can not be made in the prefabricated hole conditions, quickly screw into the keel, and thus form a connection.
Self-drilling self-tapping screw and ordinary self-tapping screw is different from the ordinary self-tapping screws in the connection, subject to drilling (drilling thread bottom hole) and tapping (including fastening connection) two processes; Screw in the connection, it will drill and tapping the two processes together once completed. It is drilled with a drill bit in front of the screw, followed by tapping with screws (including fastening connections), saving construction time and increasing construction efficiency.
Pan head and hexagon head tapping screws are suitable for the situation where drill bit is allowed to be exposed. Hex head tapping screws can be larger torque than pan head tapping screws. Self-tapping screws for countersunk head and hexagon socket type are suitable for the situation where nail head is not allowed to be exposed. Self-tapping screw in hexagon socket type can bear larger torque than self-tapping screw in countersunk head; semi-countersunk head tapping screw is suitable for nail head to allow slight exposure . Self-tapping screw, the slotted self-tapping screws need to use a screw-shaped screw, cross-slot tapping screws need to use cross screwdriver, hexagon flower-shaped self-tapping screws need hex wrench, hex head Tapping screws need to use a wrench, plum wrench, socket wrench or live wrench.