Read the correct name of the fastener in one article, and the posture!

In fact, the standard statement is that there are no screws and nuts.
Screws are commonly known as screws. Anything with an external thread can be called a screw.
The shape of the nut is usually hexagonal, and the inner hole is internal thread, which is used to cooperate with the bolt and tighten the related parts.
The nut is a common name, and the standard should be called a nut.
The head of the bolt is generally hexagonal, and the shank has an external thread.
Screws are small, with flat heads, cross heads, etc. on the head, and external threads on the rod.
The stud should actually be called a 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 with the deep hole, and the short one is connected with the nut.
Standard fasteners are divided into twelve categories, and the selection is determined according to the use occasion of the fastener and its use function.
1 bolt
Bolts are widely used in detachable connections in machinery manufacturing, and are generally used in conjunction with nuts (usually plus a washer or two washers). (Guide: What are the common faults and causes of the CNC system at work?)
2 nuts

Nuts are matched with bolts.
3 screws
Screws are usually used alone (sometimes with washers), usually for tightening or tightening, and should be screwed into the internal thread of the body.
4 studs
Studs are mostly used to connect one of the connected parts with a large thickness, and need to be used where the structure is compact or the bolt connection is not suitable for frequent disassembly. Studs are generally threaded at both ends (single-end studs are threaded at one end).Usually, one end of the thread is firmly screwed into the body of the component, and the other end is matched with the nut to play the role of connection and fastening. To a large extent, it also has a fixed distance function.
5 wood screws
Wood screws are used to screw into wood to connect or fasten.
6 Self-tapping screws
The working screw hole matched with the self-tapping screw does not need to be tapped in advance. When the self-tapping screw is screwed in, the internal thread is formed.
7 washer
The washer is placed between the supporting surface of bolts, screws, nuts, etc. and the supporting surface of the workpiece to prevent loosening and reduce the stress on the supporting surface.
8 retaining ring
The retaining ring is mainly used to locate, lock or stop the parts on the shaft or in the hole.
9 pins
Pin is usually used for positioning, can also be used to connect or lock parts, and can also be used as an overload shear element in a safety device.
10 Rivets
The rivet has a head at one end, and the shank has no thread. When in use, the rod is inserted into the hole of the connected piece, and then the end of the rod is riveted to play the role of connection or fastening.
11 connection pair
The connection pair is a combination of screws or bolts or self-tapping screws and washers. After the washer is installed on the screw, it must be able to rotate freely on the screw (or bolt) without falling off. It is mainly used for tightening or tightening.
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