Tightening Torque of a Bolted Joint

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`D_b` =

in nominal bolt diameter

`P_b` =

threads/in pitch of the bolt threads

`F_M` =

lbs required bolt preload

`mu_T` =

unitless coefficient of friction between threads

`mu_N` =

unitless coefficient of friction between nut and washer

`D_M` =

in minor thread diameter

`D_P` =

in pitch diameter of bolt threads