Given! A steel SAE Grades, $\frac{1}{2}$ in $-13$ UNCbolt is used in a $8$

auantity bolt pattem to clamp two steel menbers together in

order to resist a total $60,000$ lb extemal tensile load. The

Grade $5$ bolt has threaded and anthreaded partions of a grip as

illustrated $($tatal $1\mathrm{.}7$ in$.$ grip$).$ The combined member stiffness $(k_m)$ is $($:$5\mathrm{.}7{10}^5$