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Tightening torque
Tightening torque
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Thread type
Coarse thread
Fine thread
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Input
Design axial force
F
a
F_a
F
a
N
kN
kgf
lbf
Nominal thread diameter
d
d
d
mm
cm
m
µm
in
ft
Coefficient of friction on the thread
μ
s
μ_s
μ
s
-
Coefficient of friction under the head
μ
w
μ_w
μ
w
-
Result
Nut factor (approximate)
K
K
K
-
Tightening torque
T
T
T
N・m
kN・m
kgf・m
N・cm
lbf・ft
lbf・in
Calculate
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Tightening torque — Bolt Tightening Torque Calculator | Updraft - Mechanical Engineering Calculators