What is the bolt and what is the use of?
Screw is a type of connection that mainly consists of two parts of the threaded body and the upper part which is called flower or screw head. Nuts are auxiliary parts of connections that are generally made in polygonal shapes.
Bolts
Bolts and nuts are used to connect and secure two pieces of the same material or two materials of different materials. It looks like a cylinder with spiral threads around it completely or partially. The screws have a head in different shapes that are used to screw the screw with a variety of screwdrivers, wrenches, etc. . . It is bigger than the body of the screw and it is mounted on the stem of the screw. Types of screws are used in almost all small and large industries. Screws have different categories and are categorized based on appearance and other characteristics.
Types of screw head
Screw heads are also classified according to use:
Hidden screw head: Some screws completely sink into the work piece and become smooth and uniform with the surface. The hidden head is often flat.
Semi-round screw head: which is used in cases where a flat surface is not needed. There is a type of joint that has washers and is used to connect metal sheets.
Trapezoidal screw head: which increases the surface of the screw carrier.
Hex head screws: they are also of series types.
Types of screws and its applications
One of the most used screws is the wood screw. It is a semi-threaded wood screw with a large thread with a large distance, which is used to connect all types of wood, MDF and fiberglass.
The part that does not have a thread is for sliding into the upper part. The wood screw heads have flat, round or oval shapes. The color of these screws is silver or yellow and they have zinc or stainless steel coating. Wood screws must meet the DIN 7997 standard.
1. Car screw
Another practical screw is known as a machine screw. This type of screw is completely threaded along the length of the stem and is used with a nut. The cover of this type of screw is made of zinc. The applicable sizes of this type of screw include 8x32, 6x32, 10x32, 10x24. Machine screws should be DIN7985 standard.
2. The screw tip on
The pointed screw is also a type of screw similar to the machine screw, it has a cut in the head. This type of screw is used where high torque is needed to tighten the screw.
3
Metal screw which is used to connect metals, metal sheets and in some cases plastic and fiberglass. Metal screw is very useful for connecting metal to wood because this type of screw has small threads with short distances and in The entire length of the stem has screws. Metal screws with two-sided, four-sided, washered heads are available in the market. The metal screw must meet the DIN7981 standard.
4. The drill tip screw
There is also a screw model, similar to a metal screw, which has a drill bit to open its way during drilling and is known as a drill tip screw. A drill tip screw is made of steel and is Some brands have zinc coating. The head of this type of screw is hexagonal and sometimes they are used in the washer model. Drill tip screw must have DIN7504 standard.
5..
In industries, the hexagon screw is the most widely used of all screws. The ear screw has a hexagonal shape and a wrench or a French wrench is used to open and close it. This screw is used both in the form of full thread and in the form of half thread. In some models of this screw, dry, steel and galvanized coating is not used. This type of screw must have DIN933 or DIN931 standard.
6. screwdriver
A type of screw that is used where vibration is created due to movement and shaking and it is possible for the screw to come out of its place. It has a square section that completely sinks into the work so that the screw does not loosen during vibration.
7. Log screw (LAG)
The lag screw looks like a wood screw, but its head is hexagonal or square and has a conical thread at the end. It is used in construction and wood industries. The standard of this screw is DIN571.
8. Allen's screw or Sukti
There is a screw model that has a hexagonal head and an allen socket. An Allen key must be used to open and close it. The standard of Allen screw or socket should be DIN912.
9. Brain screw
Socket screws are used to secure surfaces and are usually produced in Allen form.
10. Eye screw
One of the screws that is used in cases where the screw is not under heavy load and is not angular, is the eye screw, which is a screw with a ring head. Eye screws are sometimes used with nuts and as a support in the work. , is used. There is an eye screw model that has a sharp automatic tip and is used as a support in work. Eye screws, wood and metal are also included in this category. The variety of screws is very high and certainly there are other types in all the categories that were mentioned.
11. Shoulder screw
Shoulder screws are also used to create support and are also known as warehouse screws and are used to withstand tensile and shear loads.
12. The lift screw or lift
One of the practical screws that is used to connect soft and plastic surfaces such as conveyor belts is the lifting or elevator screw. This type of screw has a large diameter and flat head and a narrow and square neck, in some The models are triangular, so that it does not rotate during work. The straightness of this type of screw makes it possible to smooth and polish it after installation.
13
A chipboard screw is a self-tapping or conical screw that looks like a wall screw with asymmetrical threads.
14. Concrete screws
Concrete screws, which are also known as masonry screws and blue screws, are of conical type and are used to connect different materials such as wood, metal, etc. . . It is used for concrete or other building materials. The material of this screw is stainless steel or carbon steel. The concrete screw is usually blue in color, and for installation, it is better to use a hammer drill to create a guide hole for the screw.
15. Rollplack bolt or screws
Double head screw or dowel screw is also a conical back screw without a head and is used to create a hidden connection between two pieces of wood.
16. Wall screws
The wall screw, which is a versatile screw also has a conical head, is used to connect various parts to the wall.
17. Mirror screws
There is also a screw model that is used to install a mirror, and it is known as a mirror screw. This name is given to this screw because it is a flat screw head with a thread that is a series of mirror-shaped rounds. It is placed on it. In fact, this screw is the same as a wood screw with the difference in the shape of the head.
18. Anchor screw
The anchor screw is a screw with a non-conical shank, part of which is placed in concrete and part outside of concrete. This screw is also known as anchor bolt.
19..
There is also a screw model called a carriage that prevents the screw from moving when tightening the nut. This screw model is non-conical and has a domed or flat head. This type of screw has a short square part in the part connecting the series to the stem, which is fixed in the piece.
Line
Adjusting screw or grub screw is a headless and fully threaded screw that is used to fasten a rotating part to a shaft.
