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 5855-01-483-2774
NSN 5965-01-478-9375
NSN 6240-00-875-8075
NSN 5998-01-463-3108
NSN 5975-00-229-9593
NSN 5950-00-202-5861
NSN 6620-00-316-2167
NSN 5950-01-067-7948
NSN 6145-01-169-7289
NSN 6645-00-191-4978
NSN 5975-00-173-1810
NSN 5960-00-275-7497