Internaly 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 5910-01-513-2713
NSN 5930-00-615-7879
NSN 6645-01-613-2053
NSN 6645-01-633-1852
NSN 6685-01-099-0176
NSN 5975-00-175-6696
NSN 5925-00-542-9637
NSN 6610-01-554-6279
NSN 5935-00-249-8193
NSN 5905-00-860-9666
NSN 6685-00-166-7439
NSN 6145-01-258-6673