Calculation of tightening torques and gasket/flange forces
according to VDI 2230 Part 1
considering scatter of torque, and friction coefficients
Input data
Bolt type
shank bolts
necked-down bolt
mm
Nominal diameter of the screw thread
d
N
mm
Thread pitch
P
h
mm
Pitch diameter of the screw thread
d
2
mm
Root diameter of the screw thread
d
3
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 gasket/flange force per bolt
F
VM min
kN
Maximum gasket/flange force per bolt
F
VM max
kN
Number of flange bolts
N
B
Tightening parameter combinations:
Combination number
Tightening torque scatter
[?]
±%
Minimum friction coefficient for thread
μ
G min
[?]
Maximum friction coefficient for thread
μ
G max
Minimum friction coefficient for joint face
μ
K min
Maximum friction coefficient for joint face
μ
K max
Calculate
Results
Combination number
Allowable bolt tightening torque
M
A all
N·m
Tightening torque for minimum gasket force
M
A min
N·m
Tightening torque for maximum gasket force
M
A max
N·m
with reduced scatter of total gasket force
Tightening torque for minimum gasket force
M
A min
N·m
Tightening torque for maximum gasket force
M
A max
N·m
Recommended bolt tightening torque
M
A
N·m
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