Tightening torques and forces

Calculation of tightening torques and bolt forces

Input data
	Bolt type	mm
	Nominal diameter of the screw thread d_N	mm
	Thread pitch P_h	mm
	Pitch diameter of the screw thread d₂	mm
	Root diameter of the screw thread d₃	mm
	Neck diameter d_T	mm
	Outer diameter of the bolt head or nut d_w	mm
	Through-hole diameter d_h	mm
	Half angle of the thread *β/2*	°
	Minimum yield strength of the bolt material R_p0,2	MPa
	Minimum required bolt force F_{VM min}	kN
	Maximum allowable bolt force F_{VM max}	kN
	Friction coefficient combinations:
	Combination number
	Friction coefficient for the screw thread μ_G [?]
	Friction coefficient for the joint face μ_K
	Comment



Calculation
	Combination number
	Allowable bolt tensile stress σ_M all		MPa
	Tensile stress for the minimum bolt force σ_{M min}		MPa
	Tensile stress for the maximum bolt force σ_{M max}		MPa
	Allowable stress intensity for bolt σ_V all		MPa
	Stress intensity for the minimum bolt force σ_{V min}		MPa
	Stress intensity for the maximum bolt force σ_{V max}		MPa
	Stress efficiency for the minimum bolt force		%
	Stress efficiency for the maximum bolt force		%

Results
	Combination number
	Allowable bolt tensile force F_VM all		kN
	Allowable bolt tightening torque M_A all		N·m
	Tightening torque for the minimum bolt force M_{A min}		N·m
	Tightening torque for the maximum bolt force M_{A max}		N·m