HEICO-LOCK® Wedge Lock Nut

Materials and Finishes:

Grade 10 Steel/Delta Protech KL100 Silver

Note: Due to the fact that fastening applications differ greatly, the below information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.

Dimension data
SizePart Numbermax. X1 (mm)X2 (mm)X3 (mm)


Further information

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: h heico > h material

The hardness of the mating surfaces should not exceed that of the HEICO-LOCK® Wedge Lock Nut face (class 8, class 10). 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.




Preferred range


ST - Steel

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