The square$-$threaded bolt is used to join two plates together as shown in $($Figure $1).$ The bolt has a mean diameter of $50$ mm and a lead of $3$ mm $.$ The tension in the bolt is $20$ kN $.$ The coefficient of static friction between the threads and the bolt is $\backslash (\backslash$mu$\_\{$s$\}=0\mathrm{.}15\backslash ).$

Part A

Determine the smallest torque $\backslash ($ M $\backslash )$ required to loosen the bolt.

Express your answer to three significant figures and include the appropriate units.

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