First end has internal hexagon flatted hole
A shaft having two or more different diameters (greater than 0.031 inches (0.79 millimeter)) along its length. It must have one or more of the following conditions: a specified surface finish designation in the range 1 to 125 microinches (0.025 to 3.2 micrometers) arithmetical average (aa), machined peripheral flat(s), circular groove(s), keyway(s), splines, threads, or holes. The ends and/or shoulders may be machined to accommodate bearings, couplings, and the like. It is not designed for use in aligning by fitting into corresponding holes of another item. For items used to support rotating members see axle(1), shouldered. For items not having any of the above conditions see pin, shoulder, headless. Excludes shaft(1), straight; and axle(1), straight.
Classification: Transmission shafts and cranks, except camshafts and crankshafts
NSN 5910-00-907-9422
NSN 6150-00-576-3964
NSN 5925-00-328-3885
NSN 6220-00-020-7666
NSN 5920-01-507-0172
NSN 5990-01-167-7043
NSN 7035-00-152-6485
NSN 4140-00-888-9836
NSN 5999-01-617-9762
NSN 5996-01-444-1488
NSN 5998-00-677-2833
NSN 5960-01-070-3655