First end has internal hexagon flats
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 6240-01-188-7282
NSN 5910-01-313-8394
NSN 6150-00-528-4175
NSN 6110-00-938-8701
NSN 6645-01-629-6343
NSN 5985-01-588-6277
NSN 5945-00-149-0619
NSN 6650-01-470-9715
NSN 6650-01-066-0420
NSN 7035-00-104-7613
NSN 6240-01-364-8696
NSN 5965-01-540-0743