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Bolts, Hexagonal Nut and Screw

Oct. 26, 2020

Do you know Hexagonal Nut? In life, bolts, screws, screws, etc. are often mentioned. What is the difference between them? In fact, the standard argument is that there are no screws and nuts. Screws are commonly known, and those with external threads can be called screws. The shape of the nut is usually hexagonal with an inner hole. It is an internal thread, used to mate with bolts and tighten related parts. The nut is commonly called, the standard should be called nuts. 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 crosshead, etc., and the rod has an external thread.


1. Bolt


A. General purpose bolts: There are many varieties, including hexagon head and square head. Hexagon head bolts are the most common. They are classified into A, B, C, and other product grades according to manufacturing accuracy and product quality. The A and B grades are the most used, and they are mainly used for important, high assembly accuracy, and subject to greater impact, vibration, or Where the load changes.

B. Bolts for reaming holes: When using, insert the bolts tightly into the reaming holes to prevent dislocation of the workpiece

C. Anti-rotation bolt: There are square neck and tenon

D. Special purpose bolts: including T-slot bolts, joint bolts, and anchor bolts. T-slot bolts are mostly used in places that need to be disconnected frequently; anchor bolts are used to fix the frame or motor base in the cement foundation.

E. High-strength bolt connection pair for steel structure: generally used for friction-type connection of steel structures such as buildings, bridges, towers, pipeline supports, and hoisting machinery.

Hexagon Bolt

Hexagon Bolt

2. Nut


A. General purpose nuts: There are many varieties, including hexagonal nut and square nut. Hex nuts are most commonly used in conjunction with hexagon bolts and are classified into A, B, C grades according to manufacturing accuracy and product quality. Hexagon thin nuts are used as auxiliary nuts in the anti-loosening device, which can be used for locking, or where the threaded connection pair is mainly subjected to shearing force. Hexagon thick nuts are mostly used in connections that are often disassembled. Square nuts are matched with square head bolts, and the wrench is not easy to slip when jammed. It is mostly used for rough and simple structures.


B. Slotted nut: mainly refers to the hexagonal slotted nut, that is, a slot is machined on the hexagonal nut. It is used in conjunction with screw bolts with holes and split pins to prevent relative rotation of bolts and nuts.


C. Locknut: refers to the nut with locking function, including nylon insert hexagonal lock nut and all-metal hexagonal lock nut. The hexagonal nylon ring lock nut has a very reliable anti-loosening ability. Under the operating temperature of -60~+100℃ and certain medium conditions, it has the advantages of not damaging the bolts and connected parts and being able to be frequently installed and unloaded.


D. Special purpose nuts: such as wing nuts, cap nuts, knurled nuts, and embedded nuts. Wingnuts can generally be disassembled and assembled without tools, and are usually used in places that need to be disassembled frequently and are not stressed; cap nuts are used in places where end screws need to be covered.

Hexagonal Nut

Hexagonal Nut 

3. Screw


A. Machine screws: Divided into many varieties due to a different head and groove shapes. There are several types of heads: cylindrical head, pan head, countersunk head, and semi-countersunk head. The head grooves are generally slotted (slotted), crossed, and hexagonal. Cross recessed screws have good neutrality when screwing, and their head strength is greater than that of a slotted type. They are not easy to be bald. They are generally used in mass production. Hexagon socket screws and hex socket screws can apply a large tightening torque, and the connection strength is high. The head can be embedded in the body, and it is used for the connection where compact structure and smooth appearance are required.


B. Set screws: Set screws are used to fix the relative position of the parts. The head has a slot, hexagon socket, and a square head. The square head can be applied with a larger tightening torque, the tightening force is large, and it is not easy to be bald, but the size of the head is large, it is inconvenient to be buried in the parts, and it is not safe, especially the moving parts. Slotted and hexagonal sockets are easy to sink into parts. The end of the set screw varies according to the requirements. Generally, the most commonly used three types are cone end, flat end, and cylindrical end.


C. Hexagon socket screws: Hexagon socket screws are suitable for occasions where the installation space is small or the head of the screw needs to be embedded.


D. Screws for special purposes: such as positioning screws, non-stripping screws, and eyebolts.


Above the information, provided by Hexagon Nuts Factory.


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