The square$-$threaded bolt is used to join two plates together as shown in $($Figure $1).$ The bolt has a mean diameter of $40mm$ and a lead of $3mm.$ The tension in the bolt is $24kN.$ The coefficient of static friction between the threads and the bolt is ${}_s=0\mathrm{.}15.$

Figure

$1$ of $1$

Part A

Determine the smallest torque $M$ required to loosen the bolt.

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

$M=$

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