With 2 grooves and shallow slot in center
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 5910-00-109-1987
NSN 6150-01-315-0945
NSN 2925-01-602-1975
NSN 5855-00-631-4565
NSN 5965-01-587-5182
NSN 5935-00-394-9903
NSN 5998-01-160-9483
NSN 5835-01-507-0731
NSN 6130-00-585-9448
NSN 6685-01-421-4403
NSN 7035-01-632-1212
NSN 6105-01-634-0322