!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> FrictionCalculator_DIN 946rev20Augb.xls

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  Engineering Center        
  The following equation is for calculating the TOTAL friction  
  coefficient for a nut/bolt assembly per the DIN 946 spec.:  
 
   
 
 
 
 
 
  Where:  
  MA Torque required to generate load Fv  
  FV Resulting Tension  
  P Pitch  
  d2 Bolt thread Pitch Diameter (Major Dia - 0.64952*P)  
  DKM Mean diameter of bearing face of bolt head or nut  
 
  Use the following equation to determine DKm:  
 
 
   
   
   
  Where:  
    dw Diameter of bearing surface of nut or bolt.  
    dh Clearance hole diameter  
 
  Enter the Following Information,  
  Select the Proper Units and then Click Update Button Below  
               
            Units  
      Select units:  
      MA =  
      FV =  
      P =  
      d2 =  
      Dw =  
      Dh =  
           
      Coefficient of friction (mfr) =