Micro cracks are divided into mechanical surface scars and cracks produced during quenching. 1. Scars on the mechanical surface This kind of crack is generally not deep, and the thread rolling process itself cannot completely avoid this kind of mechanical scar. 2. Cracks produced during quenching On... read more
What is the reason for the frequent slippage of self-tapping screws at the connection? Improper selection of the hole diameter of the screw may cause slippage. The processing range of the large diameter d1 value of the self-tapping screw is 4.22~4.04mm, and the processing range of the small diameter... read more
The thread of the stainless steel self-tapping lock screw is a common thread with an arc-shaped triangular section, and the thread surface also has high hardness. Therefore, when connecting, the screw can also tap the internal thread in the threaded bottom hole of the connected part, thereby Form a ... read more
From head to tail, the self-tapping screw is composed of three parts: the head, the shaft and the end of the shaft. The composition of each self-tapping screw has four major elements: head shape, screwing method, thread type, and end type. Head shape-various head shapes. There are round head (half r... read more
Thread-forming self-tapping screws: directly developed from metal screws, thread-forming self-tapping screws must be pre-drilled when used, and then screw the screw into the hole, and forcefully extrude to fit the female thread, and the original material in the female thread position Will be squeeze... read more
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