2nd flat on 1st end 90 degrees apart from 1st flat
A straight shaft having two or more of the following conditions: a specified surface finish designation in the range of 1 to 125 microinches (o.O25 to 3.2 micrometers), arithmetical average (aa), machined peripheral flat(s), circular groove (s), keyway(s), splines, threads, or holes. It is not designed for use in aligning by fitting into corresponding holes of another item. It may be drilled for lubricating holes. For items having an integral gear(s) or worm(s), see gearshaft (as modified). For items designed to support rotating members see axle(1), straight. For items not having the above conditions see pin, straight, headless. For items having machined ends which constitute steps see shaft(1), shouldered; axle(1), shouldered; and bolt, fluid passage.
Classification: Transmission shafts and cranks, except camshafts and crankshafts
NSN 7035-01-646-0272
NSN 5975-01-495-5945
NSN 6620-01-365-1499
NSN 5895-01-327-4153
NSN 6130-01-214-8128
NSN 5990-00-090-3829
NSN 5998-01-343-4672
NSN 6620-01-164-0590
NSN 5915-01-183-5010
NSN 5965-01-555-8007
NSN 4140-00-883-1115
NSN 5950-01-413-4644