What are the main differences between machine screws and self-tapping screws?
Jul 07,2022 /
BY DEVELOPERS
Self-tapping screws are mostly used for the connection between thin metal plates (steel plates, saw plates, 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 thread surface of the self-tapping screw has high hardness (≥HRC45), the internal thread can be tapped in the threaded bottom hole of the connected piece to form a connection.
Self-tapping pin screws are also mostly used for the connection between thin metal plates. The thread is an ordinary thread with an arc-shaped triangular section, and the thread surface also has high hardness, so when connecting, the screw can also tap the inner thread in the threaded bottom hole of the connected piece to form a connection. This kind of screw is characterized by low screw-in torque and high locking performance, which has better working performance than
machine screws and can be used instead of machine screws.
Wallboard self-tapping screws are used for the connection between gypsum wallboard, etc. and metal joists. The thread is double-headed thread, and the thread surface also has high hardness (≥HRC53), which can be quickly screwed into the keel to form a connection without making a prefabricated hole.
The difference between self-drilling self-tapping screws and machine screws is that when connecting machine screws, they must go through two processes: drilling (drilling threaded bottom holes) and tapping (including tightening connections); while self-drilling self-tapping screws are connected when connecting. , the drilling and tapping processes are combined at one time. It first drills with the drill bit in front of the screw, and then uses the screw for tapping (including fastening connection), which saves construction time and improves construction efficiency.
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