A coupling system for coupling a male element to a female element of the type used in excavators and similar machinery for striking and penetrating mass of dirt and stones, detachably coupled to one another, with a securing system comprising at least one body or pin for fixing the coupling position between the male and female elements, characterized in that: - the female or male element, working as a wear element, comprises a tip, - the female element comprises a cavity, opposing the tip, with four inner walls (131, 132, 133, 134) as the coupling area for coupling with the male element, said cavity having at least one projection or protuberance towards the inside thereof, said projection being provided with a convex surface, - the male element comprises a nose as a coupling area for coupling with the female element and housed within the inner walls (131, 132, 133, 134) of said cavity, said nose having at least one concave recess in at least one of its surfaces and facing the protuberance of the female element, a space or gap remaining between the convex surface of the protuberance of the female element and the concave recess of the male element, - said female and male elements coupled in a coupling direction with a curved movement between them for housing the nose inside the cavity, and - the at least one body or pin of the securing system comprises a convex bottom surface complementary to the concave recess of the male element and is housed in the cited space or gap between the male element and the female element when the body or pin is introduced, describing a curved movement too, in the same direction as the coupling direction between said male and female elements, creating a first locking area between the convex surface of the female element and a concave top surface of the curved pin or body of the securing system. - the female or male element, working as a wear element, comprises a tip, - the female element comprises a cavity, opposing the tip, with four inner walls (131, 132, 133, 134) as the coupling area for coupling with the male element, said cavity having at least one projection or protuberance towards the inside thereof, said projection being provided with a convex surface, - the male element comprises a nose as a coupling area for coupling with the female element and housed within the inner walls (131, 132, 133, 134) of said cavity, said nose having at least one concave recess in at least one of its surfaces and facing the protuberance of the female element, a space or gap remaining between the convex surface of the protuberance of the female element and the concave recess of the male element, - said female and male elements coupled in a coupling direction with a curved movement between them for housing the nose inside the cavity, and - the at least one body or pin of the securing system comprises a convex bottom surface complementary to the concave recess of the male element and is housed in the cited space or gap between the male element and the female element when the body or pin is introduced, describing a curved movement too, in the same direction as the coupling direction between said male and female elements, creating a first locking area between the convex surface of the female element and a concave top surface of the curved pin or body of the securing system.