Machine Design
A woodruff key is

All of these
Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.625 t for both the straps on the inside and outside
0.75 t for both the straps on the inside and outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

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