Hex bolts are the most widely used type of bolts. Hexagon Bolt Manufacturer's Class A and Class B bolts are used in critical applications where high assembly accuracy is required and high shock, vibration or alternating loads are tolerated. Grade C bolts are used for occasions where the surface is relatively rough and the assembly accuracy is not high. The threads on the bolts are generally ordinary threads. Common threaded bolts in West Asia have good self-locking performance. They are mainly used in thin-walled parts or where they are subjected to shock, vibration or alternating loads. Generally, bolts are partially threaded, and full-threaded bolts are mainly used for bolts with short nominal lengths and occasions where longer threads are required.
The head of the hexagonal flange bolt is composed of a hexagonal head and a flange surface. Its "support area to stress area ratio" is larger than that of ordinary hexagon head bolts, so this kind of bolt can withstand higher pre-tightening force, and the performance of preventing loosening is also very good, so hexagon flange screws are widely used in automobile engines, Heavy machinery and other products.
From the point of view of mechanical structure, the flange bolts are integrally formed with their own flange surfaces, and the contact area with the parts is large, so the friction force is large, while the contact area between ordinary hexagonal bolts and gaskets is small, so the friction force is smaller, and Due to the addition of gaskets in the middle, more coordination, and more failure points affected by the environment, so in terms of reliability, flange bolts are better.
