Second step from first end is splined
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 5905-01-215-1077
NSN 5855-01-074-0446
NSN 6135-00-947-0406
NSN 4140-00-080-8740
NSN 5930-01-477-5475
NSN 6610-00-827-4385
NSN 4140-00-894-1048
NSN 6150-01-414-6874
NSN 5965-00-757-3403
NSN 5930-01-041-7002
NSN 5930-01-013-9251
NSN 6220-01-534-2782