In the process of screwing the screw into the prefabricated hole of the connected part (drilling, punching a shell or die-casting smooth hole), the screw thread is extruded to form an internal thread in the prefabricated hole , To achieve the purpose of connection and fastening. The structure of sel... read more
Hydrogen embrittlement is a relatively prominent hidden quality hazard of self-drilling and self-tapping screws. The problem of hydrogen embrittlement is more prominent than that of carburized parts in the screws that are directly quenched by hydrocarbon co-infiltration. The hydrogen generated durin... read more
The self-tapping lock screw is a coarse thread common thread series, and the screw thread specification is M3～M12. The screw of the self-tapping locking screw has a thread with an arc-shaped triangular cross-section. The screw is hardened on the surface and can be screwed into a pre-made hole (made ... read more
(1) The screw-in performance test is to screw the self-tapping locking screw sample into the test plate until a complete thread passes through the test plate without damage; (2) The destructive torque test is to clamp the rod of the self-tapping screw test piece in an opening and closing thread mold... read more
Since self-tapping locking screws are required to have the performance of self-tapping low-carbon steel plates, they require high-hardness surfaces to achieve cutting and extrusion capabilities. At the same time, there must be sufficient heart strength and toughness to prevent distortion or twisting... read more
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