Thread stripping strength
Metric size
M1
M1.2
M1.6
M2
M3
M4
M5
M6
M8
M10
M12
M14
M16
M20
M24
M30
M36
M42
Effective length of engagement L
e
(0.75d for standard nut)
mm
Tensile yield strength of the inner part R
p0.2
MPa
Material shear strength of weakest part 0.58 R
p0.2
MPa
pitch diameter d
0
=(d
2
+d
3
)/2
mm
tensile stress area A
t
=π/4 d
0
2
mm
2
shear area A
th
= 0.5πd
0
L
e
mm
2
Shear strength F = T A
th
kN
Tensile strength F = R
p02
A
t
kN
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