Wedge Lock Nuts


The Wedge Lock Nut provides a high-quality, user-friendly bolt securing system for the most demanding of applications and is ideal for repeated use. The captive and rotary combination of the nut and the original Wedge Lock Washers makes securing your bolted joints more efficient, effective, and easier even under the most extreme vibrations and dynamic loads.

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Design of the Wedge Lock Nut

The Wedge Lock Nut is supplied preassembled. The nut and the Wedge Lock Washers are combined in a captive and rotary way, ensuring the Wedge Lock Washers and the nut are fixed permanently in the correct position with the wedge lock washers securing your bolted joint using the proven principle without loss of quality or function.




  • The one-piece design eliminates the risk of misuse
  • Minimized risk of operating and production breakdowns caused by faulty bolted connections
  • Easy handling especially in hard to reach locations
  • Fixed permanently in the correct position
  • Reduction of assembly time and effort
  • Reduced complexity of the component due to less individual parts
  • Easy, safe, and fast installation even for non-specialist users
  • Can be re-used without any reduction in function or quality


Technical specifications

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1. Pre-assembled locking system

  • Wedge Lock Nut is supplied pre-assembled and provides the user the clear benefit of always being in the correct locking position – particularly important if being installed and removed repeatedly
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2. Difference in hardness: Nut > Material

  • The hardness of the mating surfaces should not exceed that of the Wedge Lock Nut face (class 8, class 10)
  • Steel (through hardened) 485 ±25 HV0.3
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3. Difference in angles

  • The wedge angle between the Wedge Lock Washers is greater than the pitch of the bolt thread
  • This angle means the expansion in thickness of the Wedge Lock Washers is greater than the possible longitudinal movement of the bolt along the thread
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4. Difference in friction

  • The wedge-shaped surfaces have a considerably lower friction coefficient than the toothed outside of the washers
  • Loosening due to dynamic loads causes movement between the two washers in the region of the wedged shaped surfaces
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5. Difference in preload

  • An expansion in thickness of the Wedge Lock Washers because of loosening leads to an increase in the clamping force
  • This causes an increase in the preload compared to the static state and thus causes the bolt to self-lock