What types of high-strength bolts are there?

High-strength bolts are high-strength bolts and are a kind of standard parts. High-strength bolts are mainly used in steel structure engineering to connect the connection points of steel structural steel plates. High-strength 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 improved types of large hexagonal high-strength bolts for better construction. The construction of high-strength bolts must be tightened initially and then finally. The initial tightening of high-strength bolts requires an impact electric wrench or a torque-adjustable electric wrench; the final tightening of high-strength bolts has strict requirements. The final tightening of torsion-shear type high-strength bolts must use a torsion-shear type electric wrench, and the final tightening of torque-type high-strength bolts must use a torque-type electric wrench. A large hexagonal strong bolt consists of a bolt, a nut, and two washers. Torsional shear type high-strength bolts are composed of a bolt, a nut and a washer. carbon steel: Metric bolt mechanical performance grades can be divided into: There are 10 performance levels in total: 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, and 12.9. Stainless steel is divided into 60, 70, 80 (austenitic) ； 50,70,80,110(martensite) ； 45,60 (ferrite) three categories.

Thank you, learn* Got it! I wonder if there are any requirements for the connecting pair of shear-resistant high-strength bolts? Help find information. Thank you! This post was last edited by LSD0405 on 2009-3-30 20:36 ]