2nd flat grove 90degrees to 1st
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 6645-01-387-2063
NSN 6240-00-987-5464
NSN 5905-01-607-1884
NSN 2925-01-423-8141
NSN 6105-00-699-9186
NSN 5990-01-124-9063
NSN 6645-00-970-5739
NSN 5996-01-039-2704
NSN 6145-01-602-5190
NSN 5965-01-150-1920
NSN 5998-01-593-0147
NSN 6145-01-066-0943