Nord-Lock Group O produkcie Nord-Lock Nord-Lock Steel Construction Washers | User Guide

Torque Guidelines

Note that the torque guidelines below only apply to HV bolts with NLSC washers.

Washer
size

 

Reduced preload force
F *
[kN]

Modified
torque method
Torque 
M
[Nm]

 

Modified combined
method [torque + angle]
Pre-torque
M *
[Nm]

Securing
effect
Minimum torque
M

[Nm]
NL12SC 45 130   100 80
NL16SC 90 330   250 200
NL20SC 145 660   490 360
NL22SC 170 850   640 520
NL24SC 200 1100   825 640
NL27SC 260 1600   1220 1000
NL30SC 315 2150   1650 1320
NL36SC 460 3750   2800 2240
   

*Tightening conditions are specified in ETA-13/0246 for HV bolts, grade 10.9.

Required angle of further rotation

Clamp length angle part tum
t < 2d 45° 1/8
2d ≤ t < 6d 60° 1/6
6d ≤ t ≤ 10d 90° 1/4
10d < t No recommendations
Tightening angles when using the combined method varies depending on the clamp length, (t), in relation to bolt diameter, (d).

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