This article was updated May 5, 2023. It was originally published Sept. 24, 2009. Shaft keys—sometimes called sunk keys—transmit torque between shafts and shaft-mounted components such as gears or ...

Because shafts provide the inner raceways for all linear bearings, theirs is often lumped into bearing design as an afterthought. But bearing raceway sections on shafts are very critical because some ...