Fastener for connecting and spacing parts

Fastener (1) comprising a head (2) and a body (3), intended for connecting a first piece (23) and a second piece (24), each comprising a through-hole (26;

• 27) with a predetermined contour, the first (23) and second (24) pieces having respectively a first and second predetermined thickness, characterized in that the head (2) comprises a transverse stop (5) able to bear on the first piece (23), and in that the body (3) comprises a first spacer (10) and a second spacer (11), coaxial and disposed in line with each other in an axial direction, the first spacer (10), adjacent to the head (2), having a diameter greater than that of the second spacer (11) which extends starting from the first spacer (10), on the opposite side from the head (2), each of the spacers (10, 11) comprising at least one lug (13;18), the lugs (13) on the first spacer (10) being separated from the head (2) by a distance corresponding substantially to the said first thickness and the lugs (18) on the second spacer (11) being separated from the first spacer (10) by a distance corresponding substantially to the said second thickness, the lugs (13) on the first spacer (10) being aligned with the lugs (18) on the second spacer (11).