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 5920-01-524-0222
NSN 5935-01-320-7614
NSN 4140-01-377-3463
NSN 5975-00-970-5115
NSN 5910-01-602-8143
NSN 5915-01-425-2303
NSN 5835-00-733-9145
NSN 4140-01-189-0217
NSN 6610-01-283-5629
NSN 7035-00-756-4374
NSN 6130-01-442-4091
NSN 5905-01-244-0755