Do you want to ask if the coaxiality is half of the circular runout value? No. Coaxiality and circular runout are two different concepts. Coaxiality refers to the degree to which the axes of two shafts in a transmission system are on the same straight line. Circular runout is a parameter used to measure the distance between the center of the rotating shaft and the center of the track. There is no necessary mathematical relationship between them. Therefore, coaxiality cannot be half of circular runout. They are two different physical quantities and should be evaluated and considered separately.