Nord-Lock Group About Nord-Lock Nord-Lock Steel Construction Washers | User Guide

Instructions

Use our joint guide to help you use Nord-Lock steel construction washers correctly.

Link to full version of Nord-Lock Steel Construction Washers User Manual

Through-holes

Through-holes require the use of two pairs of Nord-Lock SC-washers. One pair for securing the bolt and a second pair for securing the nut. Turn both fasteners in order to close the cams on both washer pairs before tightening to minimize settlements. Keep the bolt secure whilst tightening the nut.

Designs where Nord-Lock SC-washers are not recommended:

  • With plain washers
  • When mating surfaces are not locked in place
  • When mating surfaces are harder than the washers
  • With very soft mating surfaces — for example, wood and plastic
  • For applications with extreme settlements
  • When there is no clamping force in the joint

Torque Guidelines Steel Construction Washers

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

 
Bolt size Product name Reduced preload force Modified torque method Modified combined method
[torque + angle]		 Securing effect
    Fp, C, SC*
[kN]		 torque 
MA, SC
[Nm]		 pre-torque 
MA, MKV, SC
[Nm]		 minimum torque 
MA, SC, min
[Nm]


M12

 NL12SC 45 130 100 80


M16

 NL16SC 90 330 250 200


M20

 NL20SC 145 660 490 360


M22

 NL22SC 170 850 640 520


M24

 NL24SC 200 1100 825 640


M27

 NL27SC 260 1600 1220 1000


M30

 NL30SC 315 2150 1650 1320


M36

 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).

Explore our washers today

To read more on how we handle your contact details please see our Privacy Policy.

Thank you for contacting us. Please keep an eye on your inbox – one of our colleagues will get back to you shortly via e-mail.

Select your country