Just went through the entire parts list for this machine. Can't find anything that resembles this IF it is in fact a pin. Can't tell if the end of it is threaded. If it is a pin, and does not have any threads on the very end, I do not believe this came from your CC30.
Do you have any attachments other than just the deck itself?
However, feel free to double check here:
https://www.partstree.com/parts/cub-...ni-rider-2014/