Consult centrifugal pump, pump shaft, journal and bearing installation size deviation problem
The end of the single-stage pump is part of the runner. It should be over smooth and the double nut should be near.
Benchmark does not matter, after installation, the impeller should be in the middle of the volute, do not stagger.
That is, according to the general mechanical design, the bearings are generally used in conjunction with K6
