The invention relates to a locking member being provided with a parallel to a side face running primary recess within an internal or external rim surface. This primary recess is dividing the member into a solid supporting portion (14) and a first portion (16) having a side face provided with locking means (11), the depth of the recess being such that the member forms one integrated single piece. The side face of the first portion is divided by secondary cuts (18) carried through a central point of symmetry forming a number of sectors corresponding to the number of desired locking means (11), the secondary cuts at the same time constituting gripping surfaces for tools for the manipulation and use of the member (10). The member according to the invention provides internal or external locking to an internal or external threaded but also non-threaded surface.
