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The outer hexagon screw is a matching nut used to fasten and connect two connected parts with through holes and components. Hex head screws are commonly used bolts. It is more important to use Class A and Class B outer hexagon. In addition, it is often used in the occasion of high assembly accuracy, large impact, vibration or cross rate load. Grade C outer 66 screws are used in situations where the surface is rough and the assembly accuracy is not required.

The main application of steel structure bolt nut is in steel structure engineering project to connect the nodes of steel plate thick steel structure. Better fastening characteristics, used for steel structure and engineering projects, a fastening effect. In the general steel structure, the required steel structure bolts are above 8.8 grade, there are also 10.9,12.9.

Every year, China's mechanical sector suffers losses of up to billions of yuan in public facilities, property, and personal safety due to loose connections or human theft and damage, which has a significant impact on the healthy operation of the national economy. The anti-theft nut is formed in one step with a cold pier and does not require secondary processing.

Steel structure torsion shear bolt is a high-strength bolt and also a type of standard component. Steel structural bolts are divided into torsion shear high-strength bolts and large hexagonal high-strength bolts. Large hexagonal high-strength bolts belong to the high-strength grade of ordinary screws, while torsion shear high-strength bolts are an improved type of large hexagonal high-strength bolts for better construction. The large hexagonal steel structural bolt consists of one bolt, one nut, and two washers. Twist shear steel structural bolts consist of one bolt, one nut, and one washer. On general steel structures, the required steel structural bolts are grade 8.8 or above, as well as grades 10.9 and 12.9, all of which are high-strength steel structural bolts. Sometimes, bolts on steel structures do not require electroplating.