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 . <EOS>