Wedge-Locking Technology

Nord-Lock created the original wedge-locking technology that secures bolted joints, even when exposed to severe vibration and dynamic loads. It is impossible for our products to loosen unintentionally due to the wedge created underneath the bolt head and nut.

Wedge-Locking Technology

Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system is composed of a pair of lock washers with cams on one side and radial teeth on the other.

Nord-Lock wedge-locking products secure the fastener in a joint which cannot be loosened even when subjected to extreme vibration or dynamic loads. The Nord-Lock range includes steel construction washers, wheel nuts, combi bolt washers and custom solutions. 

Tightening

When the bolt and/or nut is tightened, the teeth grip and seat the mating surfaces. Since the cam angle α, is larger than the thread pitch β, a wedge effect is created by the cams, preventing the bolt from rotating loose.​ The Nord-Lock wedge-lock washer is locked in place, allowing movement only across the face of the cams. Any attempt from the bolt/nut to rotate loose is blocked by the wedge effect of the cams.


Untightening

When a bolt is untightened with a wrench, the pair of washers expand more than the corresponding pitch of the thread, allowing the bolt/nut to rise. Nord-Lock wedge-lock washers positively secure the fastener in a joint which is subjected to any kind of vibration or dynamic loads.


Features

  • Standard range available for bolt sizes M3 - M130
  • Washers available in 5 different materials - steel, stainless steel, 254 SMO®, INCONEL® / HASTELLOY® and C-276 INCONEL® 718
  • Washers available with enlarged outer diameter (SP washers)
  • Reliable bolt securing system at high and low clamp loads

Multifunctional Wedge-Locking

Bolted joints fail for two reasons - spontaneous bolt loosening and slackening. Nord-Lock multifunctional wedge-locking technology tackles both.

The wedge-effect prevents spontaneous bolt loosening, whilst the spring effect compensates for loss of preload due to slackening – offering you total security for those situations when there can be no compromise.

How it works

  1. Upon tightening the fastener, the X-series washer flatten and the serrations engage the contact surfaces
  2. Since the cam angle α, is larger than the thread pitch β, the wedge-locking effect prevents any rotation of the fastener
  3. Directly after tightening, the joint settles and the fastener sinks into the surface material
  4. The washers immediately deflect and the spring effect (Fs) counteracts the slackening movement of the bolt, preventing loss of preload on the joint

These multiple functions continuously act on the bolted joint to maintain preload and prevent spontaneous bolt loosening - serving as a effective solution for vibration, dynamic loads, settlement and relaxation. 


Features

  • Standard range available for bolt sizes M6 - M20
  • Washers available in steel material
  • Washers available with enlarged outer diameter (SP washers)
  • Prevents bolt loosening caused by vibration and dynamic loads, and compensates for loss of preload due to settlement and relaxation

Zoekt u naar?

Productserie Nord-Lock

Nord-Lock Washers Wedge-locking security for bolted joints subjected to extreme vibration and dynamic loads
Nord-Lock X-series Washers Maximum security for critical bolted joints exposed to spontaneous bolt loosening and slackening
Nord-Lock Steel Construction Washers Optimal contact between bolts and washers used in steel contruction applications, including HV and HR sets
Nord-Lock Wheel Nuts High clamping force that eliminates wheel loosening on heavy vehicles operating under extreme conditions
Nord-Lock Combi Bolt Washers Additional layer of security for applications through permanent attachment to bolt (SEMS)
Nord-Lock Customized Solutions Custom designed bolting solutions for your unique application requirements

Succesverhalen van klanten

Reaching for the sun OHB Sweden AB provides the Solar Orbiter with systems that allow it to position itself in orbit around the sun and make a complex series of gravitational-assist fly-bys past both Earth and Venus. Since bolt loosening can’t be fixed in space, OHB takes no chances.
The Mercedes connection Hybrid vehicles use combustion engines and electric motors in parallel. High-voltage supply systems in these new vehicles place considerable demands on the connectors which provide the interface between the battery and the electronics.
In perfect rotation Since 1947, trucks from all large manufacturers such as Volvo, Scania and MAN find their way to Swedish truck body builder Laxo Mekan AB for customised chassis construction work.
Renovating Nuremberg’s metro – without affecting the timetable Renovating an underground railway system without weeks of construction and chaos caused by delays and diversions was previously unheard of.
Advantage iDapt Tennis rackets are subject to huge amounts of stress. Ever-changing hitting angles, ball speed and forces lead to vibration, twisting, deformation and settling issues. Looking to upgrade the iDapt construction, Dunlop turned to Nord-Lock.
Providing an antidote to disaster Philippe Nouaille is responsible for overseeing how nuclear plants could be better secured against earthquakes – the natural disaster which gives nuclear engineers their biggest headaches.
Competing in the world’s most dangerous race In January 2013, the legendary Dakar Rally started in Peru for the first time and end in Chile, having crossed the Andes into Argentina.
Safe operations in extreme conditions A few years ago, Stefan Ladenburger took over as Managing Partner of Holzwerke Ladenburger, representing the third generation of this family business.

Secure connections

Looking for the right solutions for your bolting needs?

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