A stack of metallic laminations, a metallic lamination and a process for forming a lamination stack. The stack of laminations includes at least one locking lamination provided with at least two locking openings and at least one passage lamination comprising at least two passage openings, each locking lamination incorporating a tab that passes through a passage opening of a lamination seated against the locking lamination, said tab being bent so as to be contained in said passage opening and seated on an edge portion of the latter, deformed to the inside of the locking opening of the locking lamination, and at least one of the parts of locking lamination and passage lamination further comprising a lock means actuating in a lock receiving means provided in the other of said parts.