Step threaded 0.312-18unc 3a
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 5930-01-586-1916
NSN 6135-01-560-8130
NSN 6650-01-145-9570
NSN 5965-01-417-3211
NSN 6130-00-017-9339
NSN 4140-01-261-5725
NSN 5950-01-202-7741
NSN 5835-01-615-0451
NSN 5935-01-274-3279
NSN 6685-00-638-9261
NSN 5975-01-299-2617
NSN 5895-01-328-8707