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Maintenance:
10.0 Tightening torques for bolts with standard
metric thread
Bolt size Tightening torques Nm
8.8 10.9 12.9
M 4 3 5 5
M 5 6 9 10
M 6 10 15 18
M 8 25 35 45
M10 50 75 83
M12 88 123 147
M14 137 196 235
M16 211 300 358
M18 290 412 490
M20 412 578 696
M22 560 785 942
M24 711 1000 1200
M27 1050 1480 1774
M30 1420 2010 2400
Bolt size Tightening torques ft-lb
8.8 10.9 12.9
M 4 2 3 4
M 5 4 7 7
M 6 7 11 13
M 8 18 26 33
M10 37 55 61
M12 65 91 108
M14 101 145 173
M16 156 221 264
M18 213 303 361
M20 304 426 513
M22 413 559 695
M24 524 798 885
M27 774 1092 1308
M30 1047 1482 1770
Strength classes for bolts with untreated, unlubricated surface. The bolt quality designation is indicated on the bolt
heads.
8.8 = 8G; 10.9 = 10K; 12.9 = 12K
The values represent 90% utilisation of the bolt yield strength with a coeffi cient of friction of μ ges. = 0.14. Adherence
to the tightening torque levels is checked using a torque wrench.
The specifi ed tightening torques do not apply if MoSo2 lubricant is used.