NCF
EN
22
5.3
Technical enclosures
Tightening torques for nuts and bolts
The tightening torques M given in the table are applicable in the following
conditions:
•
Hexagonal head UNI 5737 type screws, cylindrical head UNI 5931 and UNI
6107 type screws, in normal conditions 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 following 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.
Table 5-1: Tightening torques M for bolts with ISO metric thread
d x pitch (mm)
S r (mm²)
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
5.4
Spare parts
CAUTION!
Risk of equipment damage.
Use only Nederman original spare parts and accessories.
Contact your nearest authorized distributor or Nederman for advice
on technical service or if you require help with spare parts. See also
www.nederman.com.
Ordering spare parts
When ordering spare parts always state the following:
•
Part number and control number (see the product identification plate).
•
Detail number and name of the spare part (see www.nederman.com).
•
Quantity of the parts required.