2nd step on 1st end splined, largest diameter flatted 2 sides
A shaft 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) arithmetical average (aa), machined peripheral flat(s), circular groove(s), keyway(s), splines, threads, or holes. The ends and/or shoulders 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 support rotating members see axle(1), shouldered. For items not having any of the above conditions see pin, shoulder, headless. Excludes shaft(1), straight; and axle(1), straight.
Classification: Transmission shafts and cranks, except camshafts and crankshafts
NSN 7035-01-150-6303
NSN 5835-01-481-4204
NSN 5990-01-623-0082
NSN 5960-01-394-3846
NSN 6685-00-714-2252
NSN 5965-01-024-3532
NSN 6650-00-299-9681
NSN 5905-01-159-2526
NSN 6685-00-155-4301
NSN 5990-01-621-6969
NSN 6685-01-194-3931
NSN 5996-01-214-8363