2nd end has 2 indented flats. There are 2 pairs of flats and a keyway on the center section of the axle
An axle 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), periphersl flat(s), circular groove(s), keyway(s), splines, threads, or holes. The ends and/or sholders 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 transmit motion see shaft(1), shoulder. For items not having any of the above conditions see pin, shoulder, headless. Excludes shaft(1),straight; and axle(1), straight.
NSN 5990-01-482-5950
NSN 6650-01-092-0017
NSN 5935-01-278-9117
NSN 6650-00-187-5388
NSN 5925-01-076-4458
NSN 4140-01-625-2804
NSN 5920-00-407-5492
NSN 6620-01-633-8443
NSN 6220-00-761-6253
NSN 5930-01-113-2809
NSN 5950-00-676-3465
NSN 5895-01-624-1382