supplier for 5/8" shaft

Can anybody point me in the direction of a supplier for the keyed 5/8" shaft. Do we need to just buy the unkeyed stock & mill it ourselves?

thanks,

David Clark
Team 1245

You should be able to find 5/8 in keyed shaft at any place that sells chain and sprokets.

MSC and McMaster both will have shaft.
You should be able to find it pre-keyed.

John