NCF fan
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6.5Technical enclosures
6.5.1Tightening torques for nuts and bolts
The tightening torques M, for bolts with ISO metric thread, given in the table are applicable in the following con-
ditions:
• Hexagonal head UNI 5737 type screws, cylindrical head UNI 5931 and UNI 6107 type screws, in normal condi-
tions in which they are supplied.
• Tightening torques must be applied slowly using a torque wrench.
While maintaining the same pre-load values, tightening torques must be modified as described below in the fol-
lowing cases:
• Increased by 5% for wide-head UNI 5712 screws.
• Reduced by 10% for zinc-plated oiled screws.
• Reduced by 20% for phosphor-coated oiled screws.
• Reduced by 10% if the screw is tightened with an impulse tightener.
d x pitch [mm] S r [mm] 8.8 M [Nm] 10.9 M [Nm] 12.9 M [Nm]
6 x 1 20,1 1. 10,4 2. 15,3 3. 17,9
7 x 1 28,9 17,2 25 30
8 x 1,25 36,6 25 37 44
10 x 1,5 58 50 73 86
12 x 1,75 84,3 84,3 127 148
14 x 2 115 115 115 115
16 x 2 157 214 314 368
18 x 2,5 192 306 435 509
20 x 2,5 245 432 615 719
22 x 2,5 303 592 843 987
24 x 3 353 744 1060 1240
27 x 3 459 1100 1570 1840
30 x 3,5 561 1500 2130 2500
30
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