F16B 39/108

Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, {spring, wire} or ring immovable with regard to the bolt or object {and mainly perpendicular to the axis of the bolt with a locking washer under the nut or bolt head having at least one tongue or lug folded against the nut or bolt head, or against the object itself }