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Required information

Problem $08\mathrm{.}081-$ Shafts connected by a coupling with eight bolts

The coupled shafts shown are transmitting $250$ hp at $600re\frac{v}{m}in.$ The shafts are cohnected by a coupling with eight bolts. The bolt circle diameters are $5$ and $10$ in$.$

Problem $08\mathrm{.}081.$a $-$ Minimum nominal shoulder diameter of a bolt

Determine the minimum nominal shoulder diameter of a bolt if all bolts are to have the same diameter and not exceed a shear stress of $20$ kpsi $.$ Select a preferred fraction size.

The minimum nominal shoulder diameter of a bolt is $$ in$.$