1) Automatically centering and high precision.
2) Transfer large torque and axial force.
3) Assume greater bending moment with small shaft diameter.
4) Mechanical connection instead of welding, so the process is good.
5) Bear alternating load and impact load.
6) Reduced volume, and saving material.

1) Easy to install and disassemble and great exchangeability;
2) Heavy load born by joint with Keyless Locking Devices;
3) Long lifetime and high efficient transmitting;
4) While running under overload, Keyless Locking Devices can protect the equipment from breakdown.