1/2-20 unf 3a thd size
No other part numbers with same form, fit, and function found.
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 4140-01-423-1647
NSN 6320-01-397-9995
NSN 5855-00-408-2611
NSN 2925-01-422-1542
NSN 4140-00-254-7257
NSN 5930-01-582-6132
NSN 6240-01-223-4917
NSN 5998-00-243-7459
NSN 5945-00-113-8329
NSN 6620-01-621-0719
NSN 5895-01-256-6681
NSN 6645-01-510-4815