Self tapping screws are also used for the connection be […]
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 the self-drilling self-tapping screws and the ordinary self-tapping screws is that the ordinary self-tapping screws must pass through two steps of drilling (drilling the bottom hole) and tapping (including the 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.
The pan head and hex head tapping screws are suitable for the case where the nail head is allowed to be exposed. The hex head tapping screw can withstand a larger torque than the pan head tapping screw. Countersunk head and hexagonal flower-shaped self-tapping screws are suitable for the case where the nail head is not allowed to be exposed. The hexagonal flower-shaped self-tapping screws can withstand larger torques than the countersunk head tapping screws; the semi-sunk head self-tapping screws are suitable for the nail heads to allow slight exposure.
The occasion. When the self-tapping screws are assembled and disassembled, the slotted self-tapping screws need to use a flat-shaped screw driver, the cross-slot self-tapping screws need to use a cross-shaped screw driver, and the hexagonal flower-shaped self-tapping screws need to use a hexagonal flower-shaped wrench, and the hexagonal head self-tapping Use a wrench, a wrench, a socket wrench or a spanner wrench for the screw.