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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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