Z001019/0_8_Octobre 2011 Page GENERAL-49
GENERAL
SERVICE MANUAL MARINE ENGINES
ToC
H 2 General Tightening torques
Values in this table refer to industrial standard and are applicable, if no specific torques are are indicated.
For studs, tightening torques are to be reduced by 50%.
µ tot. *) 0.100 µ tot. 0.125
MA in Nm MA in NM
8.8 10.9 12.9 8.8 10.9 12.9
Nominal Ø Nominal Ø
M 4 2.4 3.3 4 M 4 2.7 3.88 4.6
M 5 4.9 7 8 M 5 5.5 8 9.5
M 6 8 12 14 M 6 9.5 13 16
(M 7) 13 19 23 (M 7) 15 22 26
M 8 20 2834M 8 23 3239
M 10 40 56 67 M 10 46 64 77
M 12 69 98 115 M 12 80 110 135
M 14 110 155 185 M 14 125 180 215
M 16 170 240 285 M 16 195 275 330
M 18 235 330 395 M 18 270 390 455
M 20 330 465 560 M 20 385 540 650
M 22 445 620 750 M 22 510 720 870
M 24 570 800 960 M 24 660 930 1100
M 27 840 1200 1400 M 27 980 1400 1650
M 30 1150 1600 1950 M 30 1350 1850 2250
Nominal Ø Nominal Ø
M 8x1 22 30 36 M 8x1 25 35 42
M 10x1.25 42 59 71 M 10x1.25 49 68 82
M 12x1.25 76 105 130 M 12x1.25 88 125 150
M 12x1.5 72 100 120 M 12x1.5 83 115 140
M 14x1.5 120 165 200 M 14x1.5 140 195 235
M 16x1.5 180 250 300 M 16x1.5 210 295 350
M 18x1.5 260 365 435 M 18x1.5 305 425 510
M 20x1.5 360 510 610 M 20x1.5 425 600 720
M 22x1.5 480 680 810 M 22x1.5 570 800 960
M 24x2 610 860 1050 M 24x2 720 1000 1200
M 27x2 900 1250 1500 M 27x2 1050 1500 1800
M 30x2 1250 1750 2100 M 30x2 1450 2050 2500
If the tightening torque of a screw connection is not reached, the tightness of the screw/nut
is too low or the ratio of friction do not correspond. In any case, the screw/nut is to be replaced.
*) µ tot. = total frictional value
Property
class
Metric
standard thread
Metric
standard thread
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