Torque Guidelines Steel Construction Washers, Table 1
Tightening torques to achieve the preloading force for bolting assemblies that originally corresponded to k-class K1 (usually System HV according to EN 14399-4 or EN 14399-8).
|
|
Torque method |
Bolt size |
Product name |
Tightening torque MCM,SC [Nm] |
Preloading force 1) without retightening Fp,C,red* [kN] (90%) |
Preloading force Fp,C* [kN] |
M12
|
NL12SC |
165 |
45 |
50 |
M16
|
NL16SC |
400 |
90 |
100 |
M20
|
NL20SC |
800 |
144 |
160 |
M22
|
NL22SC |
1.100 |
171 |
190 |
M24
|
NL24SC |
1.300 |
198 |
220 |
M27
|
NL27SC |
1.900 |
261 |
290 |
M30
|
NL30SC |
2.300 |
315 |
350 |
M36
|
NL36SC |
4.050 |
459 |
510 |
1) Differentation between Fp,C,red* and Fp,C* is only relevant for bolted categories B and C
Torque Guidelines Steel Construction Washers, Table 2
Pre-tightening torque for the combined method to achieve the preloading force for bolting assemblies that originally corresponded to k-class K1 (usually System HV according to EN 14399-4 or EN 14399-8).
|
|
Combined method 1) |
Bolt size |
Product name |
Tightening torque MTM,SC [Nm] |
Preloading force Fp,C [kN] |
M12
|
NL12SC |
120 |
59 |
M16
|
NL16SC |
290 |
110 |
M20
|
NL20SC |
510 |
172 |
M22
|
NL22SC |
720 |
212 |
M24
|
NL24SC |
880 |
247 |
M27
|
NL27SC |
1.300 |
321 |
M30
|
NL30SC |
1.700 |
393 |
M36
|
NL36SC |
2.700 |
572 |
1) For additional rotation angles EN 1090-2 Table 21 applies
Torque Guidelines Steel Construction Washers, Table 3
Additional rotation for the second step in the combined method (8.8 and 10.9 bolts).
Total nominal thickness "t" of parts to be connected (including all packs and washers) d = bolt diameter |
Further rotation to be applied, during the second step of tightening |
Degress |
Part turn |
t > 2d
|
60 |
1/6 |
2d ≤ t < 6d
|
90 |
1/4 |
6d ≤ t ≤ 10d
|
120 |
1/3 |
10d < t
|
No recomendations |
Tightening angles when using the combined method varies depending on the clamp length, (t), in relation to bolt diameter, (d).
Torque Guidelines Steel Construction Washers, Table 4
Additional rotation for the second step in the combined method (8.8 and 10.9 bolts).
Designation |
Nominal diameter |
Torque method |
Tightening torque MT,SC,sec [Nm] |
NL12SC
|
M12 |
80 |
NL16SC
|
M16 |
200 |
NL20SC
|
M20 |
360 |
NL22SC
|
M22 |
520 |
NL24SC
|
M24 |
640 |
NL27SC
|
M27 |
1.000 |
NL30SC
|
M30 |
1.320 |
NL36SC
|
M36 |
2.240 |