The bolts of flange couplings can take different forms, which are roughly divided into ordinary bolts and reamed bolts. According to different connecting bolts, the principle of torque transmission is also different. Bolts, elastomers, nylon rods, etc. are in the coupling The middle is an indispensable part of accessories, but seemingly small things play a big role.Using different connecting bolts, the torque transmission principle is different: 1. The connecting bolts are semi-refined ordinary bolts. At this time, there is a gap between the bolt rod and the bolt hole wall, and the torque depends on the friction between the joint surfaces of the half couplings. The force is transmitted; 2. The connecting bolts are bolts for reaming holes. At this time, the bolt rod and the bolt hole are transitional fits, and the torque is transmitted by the bolt rods undergoing extrusion and shearing.