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 5895-01-273-2789
NSN 6610-00-452-9269
NSN 5915-00-841-5817
NSN 6650-01-250-1244
NSN 5930-01-121-0956
NSN 5975-01-197-9435
NSN 6645-00-189-7075
NSN 6320-01-384-3850
NSN 5975-01-601-9848
NSN 5895-01-215-1678
NSN 5965-01-612-0531
NSN 5945-01-462-0703