Flange coupling has been highly praised by customers since its production, and its quality is excellent. Flange coupling belongs to rigid coupling. It connects two semi-coupling with flange with ordinary flat key and two axes respectively. Then it connects two semi-coupling with bolt to transfer motion and torque. This coupling has two main structural forms:

(1) The two axes are aligned by bolts in hinged holes, and the torque is transmitted by the bolts bearing extrusion and shearing.

(2) It is centered by matching the convex shoulder on one half coupling with the groove on the other half coupling. The bolts connecting the two half couplings can be used with the ordinary bolts of class B, and the torque is transmitted by the friction moment of the joint surface of the two half couplings.

The material of flange coupling can be grey cast iron or carbon steel. Cast steel or forged steel can be used under heavy load or when the circumferential velocity is greater than 30 m/s. Flange coupling requires high neutrality of two axes. When there is relative displacement between the two axes, additional load will be generated in the parts, which will worsen the working condition. This is its main disadvantage. However, because of its simple structure, low cost and large torque transmission, it has low speed, no impact and high rigidity of the shaft.