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.
Dept. of the Navy 
Brazil 
Spain 
Turkey Classification: Transmission shafts and cranks, except camshafts and crankshafts
NSN 7035-01-374-0005
NSN 5998-01-202-8811
NSN 5910-01-140-1545
NSN 6610-01-310-0553
NSN 5910-01-187-9069
NSN 6150-01-407-9398
NSN 6685-01-539-4737
NSN 6620-01-589-5411
NSN 6645-01-425-2330
NSN 6130-01-444-4518
NSN 5950-01-123-0660
NSN 5975-01-134-6966