Bolt torque equation
Torque/tension relationship
Guide to the Design Consideration on the Strength of Screw Threads
T
=
P
o
⋅
(
E
s
2
⋅
tan
(
λ
)
+
E
s
2
⋅
μ
1
cos
(
α
)
+
d
o
+
d
i
4
⋅
μ
2
)
=
P
o
⋅
(
p
2
π
+
E
s
2
⋅
μ
1
cos
(
α
)
+
d
o
+
d
i
4
⋅
μ
2
)