An expansion anchor comprising a tubular body, which extends along a longitudinal axis and comprises: a head arranged at one end and designed to be engaged inside a hole obtained in a wall; a collar arranged at the opposite end to said head; and a deformable central cylindrical portion which extends coaxially to said longitudinal axis between said head and said collar; said head comprising: a deformable body having a substantially cylindrical shape and made of a first plastic material; said anchor being characterized in that said head further comprises: two longitudinal rigid inserts which are integrated in said deformable body and are made of a second plastic material, said two longitudinal rigid inserts comprise two rectangular tabs which extend parallel to said longitudinal axis and are arranged in diametrically opposite positions, said tabs being firmly integrated in said deformable body and radially penetrate into the deformable body so as to form a single body with the said deformable body, and in that said tubular body further comprises a reinforcing ring, which is made of said second plastic material and coats said deformable body of said head wherein said second plastic material has a mechanical rigidity higher than the mechanical rigidity of said first plastic material. a head arranged at one end and designed to be engaged inside a hole obtained in a wall; a collar arranged at the opposite end to said head; and a deformable central cylindrical portion which extends coaxially to said longitudinal axis between said head and said collar; said head comprising: a deformable body having a substantially cylindrical shape and made of a first plastic material; said anchor being characterized in that said head further comprises: two longitudinal rigid inserts which are integrated in said deformable body and are made of a second plastic material, said two longitudinal rigid inserts comprise two rectangular tabs which extend parallel to said longitudinal axis and are arranged in diametrically opposite positions, said tabs being firmly integrated in said deformable body and radially penetrate into the deformable body so as to form a single body with the said deformable body, and in that said tubular body further comprises a reinforcing ring, which is made of said second plastic material and coats said deformable body of said head wherein said second plastic material has a mechanical rigidity higher than the mechanical rigidity of said first plastic material. a deformable body having a substantially cylindrical shape and made of a first plastic material; said anchor being characterized in that said head further comprises: two longitudinal rigid inserts which are integrated in said deformable body and are made of a second plastic material, said two longitudinal rigid inserts comprise two rectangular tabs which extend parallel to said longitudinal axis and are arranged in diametrically opposite positions, said tabs being firmly integrated in said deformable body and radially penetrate into the deformable body so as to form a single body with the said deformable body, and in that said tubular body further comprises a reinforcing ring, which is made of said second plastic material and coats said deformable body of said head wherein said second plastic material has a mechanical rigidity higher than the mechanical rigidity of said first plastic material.