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Metric Bolt Markings and Torque Values

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Standard Metric Bolt Dimensions and Grades
 
Bolt Assembly Torque (ft-lb)
The torque values in the table are based on the use of lubricated threads.
Size (mm) Grade 8.8 Iron Grade 10.9 Iron Grade 12.9 Iron Aluminum
6   5  10   9   4
7   9  14  18   7
8  17  25  29  14
10  33  50  50  25
12  60  85  95  40
14  90 133 145  65
16 140 200 210 100
18 200 285 290 135
20 290 400    
 
Bolt Assembly Torque (N•m)
The torque values in the table are based on the use of lubricated threads.
Size (mm) Grade 8.8 Iron Grade 10.9 Iron Grade 12.9 Iron Aluminum
6   9  13  14   7
7  14  18  23  11
8  23  33  40  18
10  45  65  70  30
12  80 115 125  55
14 125 180 195  90
16 195 280 290 140
18 280 390 400 180
20 400 550    
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