
Engineering
Center






The following equation is
for calculating the TOTAL
friction



coefficient for a
nut/bolt assembly per the DIN 946 spec.:












Where:



M_{A}

Torque required to generate load Fv



F_{V}

Resulting Tension



P

Pitch



d_{2}

Bolt thread Pitch Diameter (Major
Dia  0.64952*P)



D_{KM}

Mean diameter of bearing face of
bolt head or nut




Use the following
equation to determine D_{Km}:












Where:



d_{w}

Diameter of bearing surface of nut
or bolt.



d_{h}

Clearance hole diameter




Enter the Following Information,



Select the Proper Units and then Click Update Button
Below
















Units





Select units:






M_{A}

=







F_{V}

=







P

=







d_{2}

=







D_{w}

=







D_{h}

=













Coefficient of friction (m_{fr})

=











