ALL-METAL SELF-LOCKING HEXAGONAL DOUBLE SLOTTED NUT- BS STANDARD
The principle of self-locking nut ESL is to compress the flank of the thread of the male element on two sectors located in different planes and offset by 180 °. This principle is obtained by making two calibrated slots in the upper turret of the nut which are then crushed under a specific load to obtain a permanent deformation of the two slots (elastoplastic deformation).
During the assembly, the deformed slots in the upper turret of the ESL nut are pushed by the thread of the male element. This thrust generates pressure on the side of the flank of the thread of the male element on two sectors creating a constant locking torque (called self-locking). This self-locking torque is independent of the prevailling torque applied when tightening the ESL nut.
