Self-tapping screws are often used for connections between thin metal sheets (steel plates, sawing boards, etc.). When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece. Since the threaded surface of the tapping screw has a high hardness (≥HRC45), the internal thread can be tapped in the threaded bottom hole of the connected member to form a joint.
Self-tapping screws are also used for the connection between thin metal plates. The thread is a common thread having a curved triangular cross section, and the thread surface also has a high hardness, so that when connected, the screw can also tap the internal thread in the threaded bottom hole of the connected member to form a joint. This type of screw features low screw-in torque and high locking performance. It has better working performance than ordinary self-tapping screws and can be used in place of machine screws.
Wall panel self-tapping screws are used to connect gypsum wallboards and metal keels. The thread is double-ended thread, and the thread surface also has a high hardness (≥HRC53), which can be quickly screwed into the keel without forming a pre-made hole to form a joint.
The difference between self-drilling self-tapping screws and ordinary self-tapping screws is that ordinary self-tapping screws must pass through two steps of drilling (drilling thread bottom hole) and tapping (including fastening connection); When the screws are connected, the two processes of drilling and tapping are combined once. It first drills with the drill bit in front of the screw, and then taps with the screw (including the fastening connection), saving construction time and improving construction efficiency.