NORD-LOCK® STEEL CONSTRUCTION WASHERS

USER GUIDE

How to use our Nord-Lock steel construction washers.

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

ASSEMBLY INSTRUCTIONS

To install Nord-Lock steel construction washers, follow these 4 simple steps:

1.

Place one pair of Nord-Lock washers underneath the head of the bolt and mount it in the through hole. Place the second pair of washers on the bolt and mount the nut.

2.

Turn both fasteners (bolt head/nut) in order to close the cams on both washers before tightening to minimize settlements.

3.

Keep the bolt/nut secured while tightening the other part (bolt/nut). For guidance on which torque to tighten with, check the Nord-Lock torque guidelines.

4.

Ready!

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).