Center-to-center Distance

Center-to-center distance, abbreviated as CC, is the center distance of two spur gears is the distance from the center shaft of one spur gear to the center shaft of the other.

 

Center-to-center Distance formula
\(\large{ CC = \frac{ PD_a \;+\; PD_b }{2} }\)
Symbol	English	Metric
\(\large{ CC }\) = center-to-center distance	\(\large{in}\)	\(\large{mm}\)
\(\large{ PD_a }\) = pitch diameter gear a	\(\large{in}\)	\(\large{mm}\)
\(\large{ PD_b }\) = pitch diameter gear b	\(\large{in}\)	\(\large{mm}\)