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BS ISO EN 20898-7 torsional test and minimum torques for bolts

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BS ISO EN DIN 20898-7 Mechanical properties of fasteners: torsional test and minimum torques for bolts and screws with nominal diameters 1–10 mm

BS ISO EN DIN 20898-7 Strength ratio X

Property class
8.8
9.8
10.9
12.9
Ratio X
0.84
0.815
0.79
0.75

BS ISO EN 20898-7 Minimum breaking torques

Thread
Pitch (mm)
Minimum breaking torquea
MB min
(N • m)
Property class
8.8
9.8
10.9
12.9
M1
0.25
0.033
0.036
0.040
0.045
M1.2
0.25
0.075
0.082
0.092
0.10
M1.4
0.3
0.12
0.13
0.14
0.16
M1.6
0.35
0.16
0.18
0.20
0.22
M2
0.4
0.37
0.40
0.45
0.50
M2.5
0.45
0.82
0.90
1.0
1.1
M3
0.5
1.5
1.7
1.9
2.1
M3.5
0.6
2.4
2.7
3.0
3.3
M4
0.7
3.6
3.9
4.4
4.9
M5
0.8
7.6
8.3
9.3
10
M6
1
13
14
16
17
M7
1
23
25
28
31
M8
1.25
33
36
40
44
M8 1
38
42
46
52
M10
1.5
66
72
81
90
M10 1
84
92
102
114
M10 1.25
75
82
91
102

aThese minimum breaking torques are valid for bolts and screws with the thread tolerances 6g, 6f and 6e.

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