The connection is made using a bolt and nut and two washers as shown in$.$ The allowable bearing stress of the washers on the boards is $({}_b{)}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=2\mathrm{.}6$ksi, and the allowable tensile stress within the bolt shank $S$ is $({}_t{)}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=12$ksi. The bolt shank has a diameter of $0\mathrm{.}31$ in $.,$ and the washers have an outer diameter of $0\mathrm{.}75$ in$.$ and inner diameter $($hole$)$ of $0\mathrm{.}50$ in$.$