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 5990-01-501-9094
NSN 5930-01-279-5264
NSN 5990-01-248-0108
NSN 5935-01-377-4311
NSN 6105-00-105-5774
NSN 5998-01-231-6188
NSN 6145-00-850-4906
NSN 6685-01-310-8116
NSN 5895-01-497-2303
NSN 5960-01-550-8038
NSN 5945-01-372-9727
NSN 6610-01-555-0842