Characteristics and Application of Bolts

Hexagon bolt

Hexagon bolt is the most widely used bolt. The grade A and grade B bolts are used in important occasions with high assembly accuracy requirements and bearing large impact, vibration or alternating load. Its grade C bolts are used for occasions with rough surface and low assembly accuracy requirements. The threads on the bolts are generally ordinary threads. The common thread bolts in Western Asia have good self-locking performance. They are mainly used on thin-walled parts or in occasions subject to impact, vibration or alternating loads. Generally, bolts are made into partial threads, and full thread bolts are mainly used for bolts with shorter nominal length and occasions requiring longer threads.

Hexagon flange bolts

The head of hexagon flange bolt is composed of hexagon head and flange face. Its "ratio of support area to stress area" is larger than that of ordinary hexagon head bolt. Therefore, this bolt can bear higher preload and has better anti loosening performance. Therefore, it is widely used in automobile engines, heavy machinery and other products. When the hexagon head bolts with holes and slots are used, the bolts can be locked by mechanical methods to ensure reliable anti loosening.

Hexagon head screw bolt with hole

The cotter pin hole is made on the screw to pass through the metal wire hole, which is mechanically loosened and reliable.

Hexagon head reamed bolt

The bolts with reamed holes can accurately fix the mutual positions of the linked parts, and can withstand the shear and extrusion generated in the transverse direction.

Cross recessed hexagon head bolt

It is easy to install and tighten. It is mainly used for light industry and instruments with small load.

Square head bolt

The square head has large size and large stress surface, which is convenient for the wrench to clamp its head or rely on other parts to stop rotation. It can also be used in parts with T-grooves to adjust the bolt position.

Grade C square head bolts are often used in rough structures.

Countersunk head bolt

Square neck or tenon has the function of stopping rotation, which is mostly used in the occasions where the surface of the connected parts is required to be flat or smooth.

T-groove bolt

T-groove bolt is applicable to the occasion where the bolt can only be connected from one side of the connected parts. Insert the bolt from the T-groove and rotate it by 90 degrees to prevent the bolt from coming out; It can also be used where the structure is compact.

Anchor bolt

In the embedded concrete foundation, the articulated bolts used to fix the base of machines and equipment are mostly used in places that need to be frequently disassembled and connected and high-strength bolts used for bolt ball joints of rigid grid structures on tooling. They are mainly used for highway and railway bridges, industrial and civil buildings, towers and cranes.

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