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 5996-01-390-8258
NSN 5915-00-035-8590
NSN 5990-00-888-0718
NSN 6240-01-035-8525
NSN 6645-01-361-8947
NSN 5975-00-618-8194
NSN 5975-01-262-1948
NSN 5996-01-578-6955
NSN 5998-01-406-4916
NSN 5990-01-426-7350
NSN 5965-01-390-0736
NSN 5945-00-251-1408