Self-tapping screws are mostly used for connection betw […]
Self-tapping screws are mostly used for connection between thin metal plates. The thread is an ordinary thread with an arc-shaped triangular cross-section, and the thread surface also has high hardness. Therefore, when connecting, the screw can also tap an internal thread in the threaded bottom hole of the connected part to form a connection. This kind of screw is characterized by low screwing torque and high locking performance. It has better working performance than ordinary self-tapping screws and can be used instead of machine screws.
Wallboard self-tapping screws are used to connect gypsum wallboards and other metal keels. The thread is a double-head thread, and the thread surface also has a high hardness (≥HRC53), which can be quickly screwed into the keel without making a prefabricated hole to form a connection.
The difference between self-drilling and self-tapping screws is that ordinary self-tapping screws must go through two processes of drilling (drilling the threaded bottom hole) and tapping (including fastening the connection) when connecting; while self-drilling and self-tapping When the screws are connected, the two processes of drilling and tapping are combined and completed at one time. It uses the drill bit in front of the screw for drilling, and then uses the screw for tapping (including fastening connection), which saves construction time and improves construction efficiency.
Pan head and hexagon double-head screws are suitable for occasions where the nail head is allowed to be exposed. Hexagon head tapping screws can bear a larger torque than pan head tapping screws. Countersunk head and hexagon socket tapping screws are suitable for occasions where the nail head is not allowed to be exposed. The hexagon socket head tapping screws can bear a larger torque than countersunk head tapping screws; semi countersunk head tapping screws are suitable for slightly exposed nail heads. Occasions. When assembling and disassembling self-tapping screws, slotted self-tapping screws need flat-blade screwdrivers, cross-recessed self-tapping screws need cross-shaped screwdrivers, hex socket-shaped self-tapping screws need hex socket wrenches, hex head self-tapping Screws need to use open wrench, box wrench, socket wrench or adjustable wrench.