Calculation of tightening torques and forces of bolts
according to Roloff/Matek "Maschinenelemente", Vieweg 2000
Input data
Pitch diameter of screw thread
d
2
mm
Root diameter of screw thread
d
3
mm
Outer diameter of bolt head or nut
d
w
mm
Through-hole diameter
d
h
mm
Thread lead
P
h
mm
Half angle of thread
β/2
°
Minimal proof stress of bolt material
R
p0,2
N/mm²
Required assembly tensile force for bolt
F
VM
kN
Friction coefficients combinations:
Number of combination
Friction coefficient for screw thread
μ
G
Friction coefficient for joint face
μ
K
Comment
Calculate
Calculation
Number of combination
Allowable assembly tensile stress
σ
M all
N/mm²
Tensile stress for required force
σ
M
N/mm²
Allowable stress intensity
σ
V all
N/mm²
Stress intensity for required force
σ
V
N/mm²
Efficiency
%
Results
Number of combination
Allowable assembly tensile force for bolt
F
VM all
kN
Allowable tightening torque
M
A all
N·m
Required tightening torque
M
A
N·m
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