This is a square shaft (0.25 inches x 0.25 inches), 16.90 inches long with a "t" bar 0.75 inches long
No other part numbers with same form, fit, and function found.
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 6240-00-710-2742
NSN 6145-00-082-5172
NSN 5895-01-214-2482
NSN 6150-00-690-1145
NSN 5905-01-542-4378
NSN 5999-01-633-4120
NSN 6645-01-257-8840
NSN 6320-01-481-7322
NSN 5990-01-013-8464
NSN 5975-01-120-6083
NSN 6135-00-973-5632
NSN 6105-01-068-1835