Fastening assembly for a crampon to be coupled to a ski, which crampon has a hinge pin which, in a longitudinal direction of the hinge pin, has at least one mounting portion having a smaller dimension (m 1) in a first direction orthogonal to the longitudinal direction and a greater dimension (m 2) in a second direction orthogonal to the longitudinal direction, and a securing portion having substantially the same dimension(s) in the first and the second direction, wherein the fastening assembly comprises at least one mounting fastening portion which defines a free space extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for receiving the mounting portion of the hinge pin, and defines an opening extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for inserting the mounting portion of the hinge pin through the opening, wherein the dimension (a m) of the opening of the mounting fastening portion in the ski longitudinal direction is greater than the dimension (m 1) of the mounting portion of the hinge pin in the first direction and smaller than the dimension (m 2) of the mounting portion of the hinge pin in the second direction, and wherein the fastening assembly further comprises at least one securing fastening portion which defines a free space extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for receiving the securing portion of the hinge pin, and defines an opening extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for inserting the securing portion of the hinge pin through the opening, characterised in that the at least one securing fastening portion is at least partially resiliently flexible and the dimension (a s) of the opening of the securing fastening portion in the ski longitudinal direction is smaller than the dimension(s) of the securing portion of the hinge pin. wherein the fastening assembly comprises at least one mounting fastening portion which defines a free space extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for receiving the mounting portion of the hinge pin, and defines an opening extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for inserting the mounting portion of the hinge pin through the opening, wherein the dimension (a m) of the opening of the mounting fastening portion in the ski longitudinal direction is greater than the dimension (m 1) of the mounting portion of the hinge pin in the first direction and smaller than the dimension (m 2) of the mounting portion of the hinge pin in the second direction, and wherein the fastening assembly further comprises at least one securing fastening portion which defines a free space extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for receiving the securing portion of the hinge pin, and defines an opening extending in a direction substantially transverse to a ski longitudinal direction and substantially parallel to a ski surface, for inserting the securing portion of the hinge pin through the opening, characterised in that the at least one securing fastening portion is at least partially resiliently flexible and the dimension (a s) of the opening of the securing fastening portion in the ski longitudinal direction is smaller than the dimension(s) of the securing portion of the hinge pin.