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] |
|
|
NL12SC | 165 | 45 | 50 |
|
|
NL16SC | 400 | 90 | 100 |
|
|
NL20SC | 800 | 144 | 160 |
|
|
NL22SC | 1.100 | 171 | 190 |
|
|
NL24SC | 1.300 | 198 | 220 |
|
|
NL27SC | 1.900 | 261 | 290 |
|
|
NL30SC | 2.300 | 315 | 350 |
|
|
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] |
|
|
NL12SC | 120 | 59 |
|
|
NL16SC | 290 | 110 |
|
|
NL20SC | 510 | 172 |
|
|
NL22SC | 720 | 212 |
|
|
NL24SC | 880 | 247 |
|
|
NL27SC | 1.300 | 321 |
|
|
NL30SC | 1.700 | 393 |
|
|
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 | |
|
|
60 | 1/6 |
|
|
90 | 1/4 |
|
|
120 | 1/3 |
|
|
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] |
||
|
|
M12 | 80 |
|
|
M16 | 200 |
|
|
M20 | 360 |
|
|
M22 | 520 |
|
|
M24 | 640 |
|
|
M27 | 1.000 |
|
|
M30 | 1.320 |
|
|
M36 | 2.240 |