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Basic knowledge of screws and threads

2021-08-19

 The difference between screws, nuts, nuts, bolts, screws, and studs:

The standard statement is that there are no screws and nuts. Screws are commonly called "screws". The shape of the nut is usually hexagonal, and the inner hole is an internal thread, which is used to cooperate with the bolt and tighten the related parts. The nut is commonly called, and the standard should be called "nut". The head of the bolt is generally hexagonal, and the shank has an external thread. The screw is small, the head has a flat head, a cross head, etc., and the rod has an external thread. The actual stud should be called "double-ended stud", both ends have external threads, and the middle is generally a polished rod. The long end of the thread is used to connect to the deep hole, and the short end is connected to the nut.
 
Thread is a shape with uniform spiral lines on the outer or inner surface of a solid. Thread effect
1. Fastening and connection function: suitable for most screw products at this stage.
2. Transmission function (displacement function): such as a micrometer used for QC check size.
3. Sealing function: such as the sealing of the connection of the pipeline.
 
Type of thread
Machine thread: When assembling, drill holes and taps on the assembly first, and the inner teeth of the tapping are the same as the outer teeth of the screw, and the assembly is assembled with a smaller torque.
Self-tapping thread: When assembling, drill holes on the assembly first, without tapping the internal teeth, use a larger torque for assembly.
Self-drilling thread: directly used on the assembly, the screw is drilled and tapped at one time.
 
Screw processing method
1. Turning processing: by removing the material to make the material reach the desired shape Advantages: high processing accuracy, no mold restrictions. Insufficient: high production cost and slow processing speed
2. Forging processing (Forging): extruding the material by external force to deform it to achieve the desired shape. Advantages: fast production speed, low cost, suitable for mass production, disadvantages: molding is limited by molds, and mold costs for complex products are high
3. Cold heading: It is a process in which the metal wire is extruded and deformed with the help of external force when the metal wire is not heated. The cold heading process is only one of the forging processes.
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