Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

0.75 × diameter of bolt
1.25 × diameter of bolt
Diameter of bolt
1.5 × diameter of bolt

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

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