The proven original

Our products are based on leading wedgelocking technology and are recognized for their ability to safely secure bolted joints exposed to severe vibration and dynamic loads.

Nord-Lock wedge-locking Technology:

Nord-Lock washers secure bolted joints with tension instead of friction. The system is comprised of a pair of washers with cams on one side and radial teeth on the opposite side. Since the cam angle ‘α’ is greater than the thread pitch ‘β’ a wedge effect is created by the cams, preventing the bolt from rotating loose.

Product benefits

  • Maintains high clamp load and thereby ensures the function of the joint
  • Quick and easy to install and remove with standard tools
  • Locking function not affected by lubrication
  • Defined and uniform friction conditions which result in a more accurate preload
  • Same temperature characteristics as standard bolt / nut
  • Reusable – in addition, Nord-Lock washers do not affect the reusability of fasteners
  • The washers are hardened and can support and distribute great loads
  • Washers with enlarged outer diameter available for flanged bolts / nuts
  • High corrosion resistance
  • Can be used with fasteners up to grade 12.9 (ASTM A574)
  • Reliable locking, even for joints with short clamp length
  • Secures fasteners at both high and low preloads
  • No retightening needed
  • Verifiable locking function
  • Elegant solution and problem solving – modern engineering


Using Nord-Lock washers

Nord-Lock washers are easy and effective to use while ensuring structural security for applications exposed to vibration and dynamic loads.

Installing the washers

The pre-assembled washers are installed in pairs, cam face to cam face. Nord-Lock recommends lubrication when possible.


Tighten Nord-Lock washers with standard tools according to the guidelines (on page 9-11). Tightening guidelines for other bolt grades are available through your Nord-Lock representative.


Untightening Nord-Lock washers is as simple as tightening. Note that since the locking function is not based on increased friction, the untightening torque is generally lower than the tightening torque. Therefore it is not possible to measure offtorque as verification of locking function.

Reusing Nord-Lock

Nord-Lock washers can normally be reused. As with all fasteners, they should be inspected for wear before reassembly. Make sure that the washers are reinstalled correctly cam face to cam face. Nord-Lock recommends lubrication of fasteners before reuse in order to minimize changes in friction conditions.

Possible to verify the locking function

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