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 5925-00-757-2271
NSN 5920-01-453-0637
NSN 5925-01-305-8589
NSN 5990-01-517-7848
NSN 6685-01-487-6001
NSN 6610-01-215-4857
NSN 6645-01-357-1393
NSN 6650-01-211-2673
NSN 7035-01-376-0359
NSN 6645-01-325-5605
NSN 5915-01-113-7872
NSN 6130-00-554-3691