First end has american standard double lead worm
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 5895-01-596-0298
NSN 6620-00-684-6771
NSN 5945-01-003-9426
NSN 6620-01-193-1681
NSN 5965-01-596-8645
NSN 5925-01-214-6494
NSN 6240-00-079-1759
NSN 5935-01-572-8278
NSN 5855-01-436-7621
NSN 6645-01-641-1575
NSN 5835-00-170-5238
NSN 6685-00-403-8254