11. Why does the ESLO lock nut distribute the load evenly?

Firstly, the contact points are concentrated on the crest of the external thread, rather than near the pitch diameter side of the thread.This will greatly improve the mating performance of the threaded contact. 

Secondly, the crest of the male thread is engaged on a 30° wedge ramp,instead of contacting with a 60°normal thread bevel . 

Therefore, before preloading, the axial movement of the bolt is easy.