HEICO-LOCK® Wedge Lock Nut

NEW: HEICO-LOCK® Keilsicherungsmutter

The HEICO-LOCK® 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 nut and the original HEICO-LOCK® Wedge Lock Washers makes securing your bolted joints more efficient, effective and easier even under the most extreme vibrations and dynamic loads.




Design of the Wedge Lock Nut

The HEICO-LOCK® Wedge Lock Nut is supplied pre-assembled. The nut and the HEICO-LOCK® Wedge Lock Washers are combined in a captive and rotary way, ensuring the HEICO-LOCK® 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 HEICO-LOCK® principle without loss of quality or function.

Advantages for you 

  • The one piece design eliminates the risk of misuse
  • Minimized ridk 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


1. Pre-assembled locking system

  • The HEICO-LOCK® 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

2. Difference in hardness: HHEICO > HMaterial

  • In comparison to the surface of the HEICO-LOCK® Wedge Lock Washers (class 10) the surface hardness of the clamped parts has to be lower
    • Steel (through hardened) 485 ±25 HV0.3

3. Difference in angles: α > β

  • The wedge angle (α) between the HEICO-LOCK® Wedge Lock Washers is greater than the pitch (β) of the bolt thread
  • This angle means the expansion in thickness of the HEICO-LOCK® Wedge Lock Washers is greater than the possible longitudinal movement of the bolt along the thread

4. Difference in friction: μa > μi

  • The wedge-shaped surfaces have a considerably lower friction coefficient μi than the toothed outside of the washers (friction coefficient μa)
  • Loosening due to dynamic loads causes movement between the two washers in the region of the wedged shaped surfaces

5. Difference in preload: Fdyn > Fstat

  • An expansion in thickness of the HEICO-LOCK® Wedge Lock Washers as a result 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


Intstallation Example


Fields of Application


Product Overview

MItem No. SteelExternal Diameter [mm]Box Qty.
M6 HLM-6 14,2 100
M8 HLM-8 17,9 100
M10 HLM-10 21,8 50
M12 HLM-12 26,0 50
M14 HLM-14 29,9 30
M16 HLM-16 34,5 25
M18 HLM-18 38,0 20
M20 HLM-20 42,8 10
M22 HLM-22 46,0 10
M24 HLM-24 51,0 5
M27 HLM-27 56,0 5
Fine-pitch ThreadItem No. SteelExternal Diameter [mm]Box Qty.
M20 x 1.5 HLM-20x1.5 42,8 1 / 10
M22 x 1.5 HLM-22x1.5 46,0 1 / 10


Non-standard sizes and materials on request.



Click for further information