Customizing various types of metal fasteners (industrial grade)

Fasteners are a kind of mechanical parts which are used for fastening and connecting
 and are widely used. All kinds of fasteners can be seen on all kinds of machinery, equipment,
 vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and
supplies. It is characterized by a wide variety of specifications, different performance and
use, and a high degree of standardization, serialization and generalization. So it is also
 called standard fasteners, or standard parts for short. Fasteners are the most widely used
mechanical base parts.

Spare parts

It usually includes the following 12 types of parts:

1 bolt: a fastener consisting of two parts, the head and the screw (the cylinder with outer thread).
 It needs to cooperate with the nut to fasten and connect two parts with through holes. This form
of connection is called a bolt connection. If the nut is swirled down from the bolt, the two parts
can be separated, so the bolt connection is a detachable connection.

2 stud: a kind of fastener with no head and only both ends with thread. When connecting, one
end of it must be screwed into the part with inner thread hole, and the other end goes through
 the part with through hole, then screw up the nut, even if the two parts are fastened to a whole.
This form of connection is called a stud connection, and it is also a detachable connection. It
is mainly used to be connected parts with a large thickness, compact structure, or frequent
disassembly, which should not be used for bolt connection.

The 3 screw is also a fastener made up of two parts of the head and the screw, which can be
divided into three kinds according to its usage: machine screws, set screws and special
purpose screws. The machine is mainly used for fastening a screw thread hole and fastening
parts, connection between a part with a through hole, do not need to match the nut (this
connection is called screw connection, also belongs to the detachable connection; also can
be matched with a nut for two with a through hole between the parts are tightly connected.)
The tightening screw is mainly used to fix the relative position between the two parts. Special
use screws, such as ring screws, are used for hoisting parts.

4: nut with inner thread hole, the shape is flat six prism, there is a flat square cylindrical or flat
cylindrical, with bolts, studs or machine screws for fastening connecting two parts, make it
become a whole.

5. self tapping screws: similar to the machine screws, but the thread on the screw is a special
screw for the self tapping screw. It is used for fastening and connecting two thin metal components,
 making it a whole. It is necessary to make small holes in components in advance. Because the
 screw has higher hardness, it can be directly screwed into the Kong Zhong of the component,
 forming the internal thread of response in the component.

6. wood screw machine screw is similar, but the thread on the screw for wood screws with the
 special thread, can be directly screwed into the wooden components (or parts), used to put a
 hole with the metal (or metal parts) with a wooden component fastening together. This
connection also belongs to a detachable connection.

7.: the shape of a washer type fastener oblate ring. Between the supporting surface is arranged
on the bolts, screws or nuts and connecting parts surface, plays an increasing connecting
parts contact surface area, reduce the pressure per unit area and protect the connected
 part surface is not damaged; another kind of elastic washer, also prevents the nut loosening.