1.This coupling is the most widely used rigid coupling 2.Simple structure, reliable performance, torque delivery, assembly and disassembly. Shaft hole keyway forms provided by GB/T3852-1997. 3.GY-based system using hinge bolt hole on the assembly and disassembly without moving along the axial. 4.GYS type bump on the tongue, processing convenience, but disassemble to move along the axis. 5.Shaft hole pattern can also be a cone.