What is the centering function?

The centering function is a function that suppresses the runout of the boss when the shaft and boss are fastened together.

In other words, it's a function of how close you can bring the axis to the center of the boss.

There are two types of Power-Lock: one with a centering function and one without.
For series without this, it is necessary to provide a guide section on the boss (the part where the shaft and boss come into direct contact).

Practical centering accuracy can be achieved by setting the guide length to half the shaft diameter.