Maximum tensile loading
Metric thread :
M1
M1.2
M1.6
M2
M3
M4
M5
M6
M8
M10
M12
M14
M16
M20
M24
M30
M36
M42
-
3.6
4.6
4.8
5.6
5.8
6.8
8.8
9.8
10.9
12.9
Initial tensile stress : σ
t
=
·R
p0.2
pitch P
mm
pitch diameter d
2
mm
root diameter d
3
mm
tensile stress area A
t
=π/4 d
0
2
; d
0
=(d
2
+d
3
)/2
mm
2
ultimate tensile strength R
m
MPa
yield strength R
p0.2
MPa
initial tensile stress σ
t
=
α
R
p0.2
MPa
Initial load F
i
= A
t
σ
t
kN
Load at Yield F
0.2
= A
t
R
p0.2
kN
Load reserve P
b
=F
0.2
- F
i
kN
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