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 ...

If you’ve ever trained for a marathon, then chances are you’ve heard about (and either love or hate!) the marathon taper. A taper, or tapering, refers to the reduction of exercise before a competition ...