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Example calculation

Calculation of tightening torques and bolt forces

according to VDI 2230 Part 1

Input data

  Bolt type      mm
  Nominal diameter of the screw thread dN   mm
  Thread pitch Ph   mm
  Pitch diameter of the screw thread d2   mm
  Root diameter of the screw thread d3   mm
  Neck diameter dT   mm
  Outer diameter of the bolt head or nut dw   mm
  Through-hole diameter dh   mm
  Half angle of the thread β/2   °
  Minimum yield strength of the bolt material Rp0,2   MPa
  Minimum required bolt force FVM min   kN
  Maximum allowable bolt force FVM max   kN
 

Friction coefficient combinations:

  Combination number  
  Friction coefficient for the screw thread μG [?]  
  Friction coefficient for the joint face μK  
  Comment  
 
 
 

Calculation

  Combination number  
  Allowable bolt tensile stress σM all   MPa
  Tensile stress for the minimum bolt force σM min   MPa
  Tensile stress for the maximum bolt force σM max   MPa
  Allowable stress intensity for bolt σV all   MPa
  Stress intensity for the minimum bolt force σV min   MPa
  Stress intensity for the maximum bolt force σV max   MPa
  Stress efficiency for the minimum bolt force   %
  Stress efficiency for the maximum bolt force   %
 

Results

  Combination number  
  Allowable bolt tensile force FVM all   kN
  Allowable bolt tightening torque MA all   N·m
  Tightening torque for the minimum bolt force MA min   N·m
  Tightening torque for the maximum bolt force MA max   N·m

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