Self-tapping screws are used for thin sheet metal (steel, saws etc.) connections. Connection, the first being a thread bottom connector system, and then tapping screw is screwed into the threaded connector in the bottom. As the self-tapping screw thread surface has a high hardness (≥ HRC45), can be connected pieces of thread tapping the bottom of internal thread to form the connection.

Tapping off the screws for thin metal plate over the connection between. The thread is a curved triangular cross-section of the common thread, thread also has a high surface hardness, so the connection, the screw can also be connected pieces of the threaded bottom of attacking the internal thread to form the connection. This screw is characterized by a low torque and high-locking screw into the performance, than conventional self-tapping screw with improved performance, and can be used instead of machine screws.
Self-tapping screws for gypsum wallboard wall panels and metal such as the connection between the keel. The thread for the double-headed screw, thread also has a high surface hardness (≥ HRC53), the system can not hole out of pre-conditions, quickly screw into the keel, thus form a connection.
Self drilling screws self-tapping screws and common difference between an ordinary self-tapping screws in the connection, it should be through drilling (drilling screw bottom) and tapping (including fastening connection) two processes; and self-drilling tapping screw in the connection, it will be drilling and tapping a complete merger of two processes. Screw it in front of the first drilling bit, and then tapping on the use of screw (including the fastening connection), save construction time, improve construction efficiency.
Pan head and hex head tapping screws applied to the bit to allow the exposed places, Hexagon head tapping screws Pan head tapping screws than with the larger torque. Shen and Hexagon head tapping screws with heads are not allowed to expose for the occasion, Hexagon head tapping screw tapping screw than quiet bear larger torque; semi-quiet head tapping screws to allow for the nail head slightly exposed occasions. Self-tapping screw assembly and disassembly, the slotted self-tapping screws Xuyong a zigzag Screwdrivers, Cross recessed tapping screw Xu Yong cross Screwdrivers, Hexagon tapping screws Xu Yong Hexagon wrenches, hexagon head tapping screw Xu Yong wrenches, box wrenches, socket wrench or spanner.