A locking washer intended for being compressed axially between a bearing element and a screwable element , said screwable element being connected to said bearing element by a shank member suitable for traversing said locking washer , wherein said locking washer comprises two washer crowns having each a range of bearing without radial grooves and an engagement face , said engagement face having a plurality of asymmetrical radial teeth , each of said radial asymmetrical teeth having, on the one hand, a crest and a tooth bottom spaced angularly from said crest, and, on the other hand, a sliding side inclined extending angularly between said crest and said tooth bottom , and wherein said engagement faces of said washer crowns are suitable for being applied against each other, whereas the sliding sides come into contact with each other, respectively, said washer crowns , which are applied against each other and maintained compressed under axial pressure between the screwable element and the bearing element , respectively, being suitable for being brought into rotation with the screwable element and the bearing element , respectively, when the screwable element loosens, with a view to bringing the washer crowns into rotation relative to each other, whereas the respective sliding sides are brought along slidingly against each other while forming a ramp to separate the washer crowns axially from each other to bring about the locking against rotation of the screwable element ; said locking washer presenting - a shape of a truncated cone, and - that said locking washer being elastically deformable in order to be able to be flattened, forming a spring between said bearing element and said screwable element to maintain said axial pressure substantially constant, whereby said washer crowns are suitable for being brought along in rotation relative to one another when said bearing element and said screwable element are separated axially from each other, - wherein each of the asymmetrical radial teeth also has a stop side opposite said sliding face relative to said crest , and - said stop sides of said asymmetrical radial teeth of said engagement faces come into contact with each other, respectively, when said engagement faces of said washer crowns are applied against each other, characterized in that said washer crowns having axial planes intersecting the asymmetrical radial teeth according to said crest , the stop sides are substantially inclined relative to the axial planes, and in that said engagement faces are treated to reduce the friction forces between said sliding faces . - a shape of a truncated cone, and - that said locking washer being elastically deformable in order to be able to be flattened, forming a spring between said bearing element and said screwable element to maintain said axial pressure substantially constant, whereby said washer crowns are suitable for being brought along in rotation relative to one another when said bearing element and said screwable element are separated axially from each other, - wherein each of the asymmetrical radial teeth also has a stop side opposite said sliding face relative to said crest , and - said stop sides of said asymmetrical radial teeth of said engagement faces come into contact with each other, respectively, when said engagement faces of said washer crowns are applied against each other, <EOS>