High-strength bolts can bear a larger load than ordinary bolts of the same standard. The general bolt material is manufactured by Q235 (namely A3). The material of high-strength bolt 35# steel or other materials is heat-treated after being manufactured to increase the strength. The difference between the two is the difference in data intensity. The following rivet nut manufacturers will tell you the difference.

From the original data, high-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, commonly used 45 steel, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA, etc. General bolts are usually made of Q235 (equivalent to A3 in the past) steel.

In terms of strength levels, high-strength bolts are increasingly used. Two strength levels of 8.8s and 10.9s are commonly used, of which 10.9 is the majority. Generally, the bolt strength grade is low, generally 4.4, 4.8, 5.6 and 8.8.

From the perspective of force characteristics, high-strength bolts exert pretension and rely on conflicting forces to transmit external forces. Generally, bolts are connected by the shear resistance of the bolt and the pressure of the hole wall to transmit the shear force. The pretension force that occurs when the nut is tightened is very small, and its effect can be ignored. In addition to its high material strength, high-strength bolts also impose a large amount on the bolt. The pre-tension force causes the squeezing force to occur between the connecting components, which causes a great conflict force perpendicular to the screw direction, and the pre-tension force, the anti-slip coefficient and the steel variety directly affect the bearing capacity of the high-strength bolts.

From the point of view of application, high-strength bolts are generally used for the connection of the main components of the building structure. General bolts can be reused, but high-strength bolts cannot be reused. High-strength bolts are generally used for connection.

High-strength bolts are pre-stressed bolts, the conflict type uses a torque wrench to apply regular pre-stress, and the pressure-bearing type unscrews the torx head. Generally, bolts have poor shear resistance and can be used in secondary structural parts. Generally, the bolts only need to be tightened.

General bolts are generally 4.4, 4.8, 5.6 and 8.8. High-strength bolts are generally 8.8 and 10.9, of which 10.9 is the majority. Level 8.8 is the same level as 8.8S. The force performance and calculation methods of general bolts and high-strength bolts are different. The force of high-strength bolts is first applied by pretensioning P in the interior, and then conflict resistance occurs on the contact surface between the connected parts to bear the external load, while the general bolts directly bear the external load.