Work out the clamping force, in kilograms, exerted by the M$30$ steel nut and bolt on the plates shown below. The nut has been torqued down to $6$ Nm$.$

Use the following formula and information:

Torque $=$ K x D x P

Where

K $=$ constant to account for friction, D $=$ diameter of bolt $($m$),$ P $=$ clamping force $($kg$)$