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Tightening torque
Bolt tightening torque of general tightening part
Intensity
level
Grade 4.8-6.8 (mark "4" on the head of the
bolt)
Grade 8.8 (mark "7" or "8.8" on the head of
the bolt)
Bolt diameter
Tightening torque
range
Standar
d value
Breaking
torque
Tightening
torque range
Standard
value
Breaking
torque
M4
1-2
1.4
/
1.5-3
2.5
/
M5
2-4
2.9
4.5
3-6
4.5
8
M6
4-7
4.9
10
8-12
10
14.5
M8
10-16
12.2
20
18-28
22
34
M10
22-25
24.5
45
40-60
44
76
M12
35-55
43
75
70-100
77
112
M14
50-80
69
123
110-160
124
200
M16
80-130
110
195
170-250
200
300
M18
130-190
150
285
200-280
270
450
Remarks: The connection tightening torque of plastic parts is half of the tightening torque of grade 6.8 bolts
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