Thd designation 1/2-20unf 3a
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 5985-01-536-9900
NSN 5915-00-203-2859
NSN 6110-01-158-7037
NSN 6110-01-487-2842
NSN 5950-01-649-2980
NSN 2925-01-517-4037
NSN 5925-01-465-9581
NSN 6240-00-566-8371
NSN 6240-01-252-8850
NSN 6145-01-011-3231
NSN 5975-01-460-1386
NSN 7035-00-981-7216