The rigid coupling is composed of rigid force transmitting members, and the coupling members can not move relative to each other, so there is no ability to compensate the relative offset of the two axes. It is only suitable for the two shafts being connected to be strictly centered during installation. When there is no relative displacement between the two axes, the flange coupling has no elastic component and does not have the functions of vibration damping and buffering. It is generally only suitable for working conditions with stable load and no shock vibration.

Rigid couplings used to be called fixed rigid couplings, including flange couplings, radial key flange couplings, boring shaft couplings, clamp couplings, and sleeve couplings. Wait. Rigid couplings are generally simple in construction and low in manufacturing cost. When selecting a rigid coupling, the error of the alignment of the two axes of the joint should be minimized. In order to reduce the influence of the additional load on the coupling, the distance between the coupling and the bearing should be minimized. Flange couplings (also known as flange couplings) are bolted to two flange (flange) disc type half couplings 

There are two main types of rigid couplings: 1 by means of bolts to achieve two-axis centering and by bolts to withstand compression and shear to transmit torque; 2 by a semi-coupling The shoulder is centered with the groove on the other half of the coupling. The bolts connecting the two coupling halves can be made of ordinary bolts of Class A and Class B, and the torque is transmitted by the frictional moment of the joint faces of the two coupling halves. The material of the rigid coupling can be made of grey cast iron or carbon steel, cast steel or forged steel at heavy load or at a peripheral speed of more than 30 m/s.