2 opposing flats each end
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 5965-01-396-7508
NSN 5990-01-555-6616
NSN 5895-01-415-3114
NSN 5855-00-135-0797
NSN 4140-01-495-1466
NSN 2925-00-860-3652
NSN 5855-00-930-9478
NSN 6110-01-458-1006
NSN 2925-01-109-1518
NSN 5895-01-551-1305
NSN 5925-01-452-6351
NSN 5960-01-066-2300