Generally, there are 12 types of hardware parts as below
1,Bolts：
A type of fastener consisting of a head and a shank (a cylindrical body with external threads). Together with nuts, used for fast connection of two parts with through holes. This connection form is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection also called detachable connection.
2,Stud：
A kind of fasten which have no head, both of the ends with thread.When linking, one end of it must be screwed into a part with an internally threaded hole, the other end must pass through a part with a through hole, and then screw on a nut, even if the two parts are tightly connected as a whole. This type of connection is called a stud connection, and it is also a detachable connection. It is mainly used in occasions where one of the parts to be connected has a large thickness and requires a compact structure, or where bolt connection is not suitable due to frequent disassembly.
3,Screws：
Also consisting of a head and a shank. According to the use, it can be divided into three categories: machine screws, set screws and special purpose screws. Machine screws are mainly used for a fastened connection between a part with a fixed threaded hole and a part with a through hole, without the need for nut fit (this connection form is called screw connection, which is also a detachable connection; it can also be Cooperate with nuts for fast connection between two parts with through holes.) Set screws are mainly used to fix the relative position between two parts. Special-purpose screws, such as ring screws, are used for lifting parts.
4,Nut：
With internal threaded holes, the shape is generally in the shape of a flat hexagonal column, and also in the shape of a flat square column or a flat cylinder, with bolts, studs or machine screws, used to fasten and connect two parts to make it a whole .
5,Self tapping screw：
Similar to a machine screw, but the thread on the screw is a special thread for self-tapping screws. It is used to fasten and connect two thin metal components to make them a whole. Small holes need to be drilled on the components. Because of the high hardness of this kind of screw, it can be directly screwed into the hole of the component to make the component Form the corresponding internal thread. This connection form is also a detachable connection.
6,Wood Screw：
It is also similar to machine screws, but the thread on the screw is a special thread for wood screws, which can be directly screwed into wooden components (or parts), and is used to connect a metal (or non-metallic) part with a through hole to a wooden component. Fasten together. This connection is also a detachable connection.
7,Washer：
A type of fastener in the shape of an oblate ring. Placed between the supporting surface of the bolt, screw or nut and the surface of the connected part, it plays the role of increasing the contact surface area of the connected part, reducing the pressure per unit area and protecting the surface of the connected part from being damaged; another type of elastic washer, It can also play a role in preventing the nut from coming back loose.
8,Clips：
It is installed in the shaft groove or hole groove of the machine and equipment, and plays a role in preventing the parts on the shaft or hole from moving left and right.
9,Pin：
It is mainly used for positioning parts, and some can also be used for connecting parts, fixing parts, transmitting power or locking other fasteners
10,Rivets：
A type of fastener consisting of a head and a shank, used to fasten and connect two parts (or components) with through holes to make them a whole. This form of connection is called a rivet connection, or riveted for short. genus with non-detachable connection. Because to separate the two parts connected together, the rivets on the parts must be broken.
11,Seam Screw：
Seam screw is a kind of fastener supplied in combination, such as a combination of a certain machine screw (or bolt, self-supplied screw) and a flat washer (or spring washer, lock washer);
12,Welding stud：
A heterogeneous fastener consisting of a nail shank and a nail head (or no nail head), which is fixedly connected to a part (or component) by welding for connection with other parts.
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