Self-tapping screws are in the metal or non-metallic materials in the pre-drilling hole in the self-drilling with a female thread with a threaded fastener. Self-tapping screws have the characteristics of high tension, single piece, unilateral combination.
With high pull, single, unilateral combination of features. Self-tapping screws are used for connection between thin metal plates (steel plates, saw boards, etc.). When connecting, first thread the bottom of the connector, and then screw the tapping screw into the threaded bottom hole of the connected part. As the tapping screw thread surface has a high hardness (≥ 45HRC), can be connected to the threaded bottom hole in the internal thread, so as to form a connection.
Self-tapping locking screws are also used for connections between thin metal plates. The thread is an ordinary thread with an arc triangular cross section, and the thread surface also has a high hardness. Therefore, when connecting, the screw can also draw the internal thread in the screw bottom hole of the connected part, thus forming the connection. The screw is characterized by a low screw-in torque and high locking performance, better working performance than conventional tapping screws and can be used instead of machine screws.
Wall tapping screws for gypsum wall panels and the connection between metal keels. The thread is double-headed thread, the thread surface also has a high hardness (≥ HRRC53), can not make the prefabricated hole conditions, quickly into the keel, thus forming a connection.
Self-drilling tapping screws and ordinary tapping screws is different from the ordinary tapping screws in the connection, to be drilled (drilling through the bottom hole) and tapping (including fastening connection) two processes; and self-drilling When the screw is connected, the drilling and tapping processes are completed once. It is first drilled with a drill bit in front of the screw, then tapped with screws (including fastening connection), saving construction time and improving construction efficiency.
The head and hex head tapping screws are suitable for applications where the nail head is exposed, and the hex head tapping screws are subjected to greater torque than the pan head tapping screws. The countersunk head and the hexagonal flower tapping screw are suitable for the case where the nail head is not allowed to be exposed. The hexagon socket tapping screw can bear the larger torque than the selfhead tapping screw. The semi-countersunk head tapping screw is suitable for the nail head to allow the slight exposure Of the occasion. Self-tapping screw assembly and disassembly, slotted tapping screws need to use a screwdriver screwdriver, cross-slot tapping screws need to use a screwdriver screw, hexagonal hexagonal tapping screw need to use hexagonal wrench, hex head Screws need to use wrenches, plum wrenches, socket wrenches or live wrenches.
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