MAXIMUM TENSILE LOADING
Metric thread :
M1
M1.2
M1.6
M2
M3
M4
M5
M6
M8
M10
M12
M14
M16
M20
M24
M30
-
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
=
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.11
1.25
1.67
xR
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
tensile stress σ
t
= σ'
t
x R
p0.2
MPa
Tensile load F
i
kN
1)
Ultimate tensile stress of 8.8 grade is 800 MPa, the Yield strength is 0.8
·800=640 MPa. An initial tensile stress of 800 MPa is selected by taking
=1/0.8=1.25R
p0.2
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