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 5945-01-417-7696
NSN 5895-01-095-1353
NSN 4140-00-035-4997
NSN 5905-01-645-7260
NSN 5910-01-482-0970
NSN 6135-01-304-8652
NSN 6620-01-426-2220
NSN 5855-01-321-3881
NSN 5999-01-145-3330
NSN 5855-01-287-1515
NSN 6145-00-249-8781
NSN 5835-01-431-6877