=Introduction= Keyed shafts rotate inside axial bearings to transmit power. Keys are fit into keyways to fix wheel hubs, gears, sprockets, and other accessories to keyed shafts.
=Challenges= Power transmission often requires rotating shafts with sprockets, brakes, pulleys, gears, wheels, and many other types of devices attached in unique configurations.
=Approaches= A round steel shaft with a keyway allows for similarly keyed interchangeable components to be positioned securely along it's entire length. Such a shaft can be manfactured from round stock with as little as a broach and a hammer.
<gallery> Rear wheel assembly.jpg| </gallery>
=Development targets=
ISO 500-3 for PTO splines<br> ISO 5673-1 is a good start for other splines.<br> ANSI B92.1<br> DIN 5480 & ISO 4156<br> JIS B1603<br>
=References=
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