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 6150-01-028-3350
NSN 5930-01-411-6534
NSN 5915-00-187-7561
NSN 6320-01-268-3072
NSN 6220-00-980-7299
NSN 5895-00-080-2003
NSN 5998-00-633-5169
NSN 5915-01-645-4809
NSN 5905-00-517-9352
NSN 5925-01-608-3822
NSN 6240-01-219-4276
NSN 5910-01-023-0078