From the point of view of raw materials, material of High Strength Bolt and Common Bolt strength is different.
High strength bolts are made of high strength materials. The bolts, nuts and washers of high strength bolts are made of high strength steel, commonly used in 45 steel, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA, etc. Common bolts are usually made of Q235 (equivalent to the previous A3) steel.
From the strength level, high-strength bolts are used more and more widely. 8.8s and 10.9s strength grades are commonly used, of which 10.9 grade is the most. The strength grade of ordinary bolts is lower, generally 4.4, 4.8, 5.6 and 8.8.
From the force characteristics, high strength bolts exert pre-tension and transfer external force by friction. Ordinary bolt connection relies on bolt shear and hole wall pressure to transmit shear force. Pre-tension force is very small when screwing nuts, and its influence can be neglected. In addition to high material strength, high-strength bolts also exert large pre-tension force on bolts, which causes extrusion force between connecting components, so that there is a great friction force perpendicular to the direction of bolt, and the pre-tension force, anti-slip coefficient and steel. The bearing capacity of high strength bolts is directly affected by the types of timber.
According to the characteristics of force, it can be divided into pressure type and friction type. The calculation methods are different. Minimum specification M12 of high strength bolts, commonly used M16 ~ M30, the performance of super-large bolts is unstable, High Strength Bolt and Common Bolt should be carefully used in design.
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