Attachment arrangement

Attachment arrangement comprising a base member (1, 21), an intermediate member (9, 29), and a cooperating part (12, 32), said base member (1, 21) comprises a hollow non-circular head (15, 35) having an axis, a thread (3, 23) formed in said head and extending in the axial direction thereof, and first anti-rotation surfaces (11, 24) on said head, said intermediate member (9, 29) having at least one through opening (13, 33) extending in the axial direction of said head (15, 35) and second anti-rotation surfaces (10, 30) for providing a locked connection preventing rotation, wherein the improvement comprises that said cooperating part (12, 32) has a non-circular opening (14, 34) for permitting the insertion of said head (15, 35) of said base member (1, 21) in a specific angular position into said cooperating part (12, 32), and a spring element (5, 27) deflectable parallel to the axial direction of said head (15, 35) being positioned on said base member (1, 21), said spring element (5, 27) including an annular member (8, 28) and being positioned between said base member (1, 21) and said intermediate member (9, 29) relative to the axial direction of said head, said spring element (5, 27) comprises first matching surfaces (7, 26) cooperating and interengaging with said first anti-rotation surfaces (11, 24) on said head and second matching surfaces (6, 25) cooperating with said second anti-rotation surfaces (10, 30) on said intermediate member (9, 29), said first matching surfaces (7, 26) are formed by edge surfaces bordering an opening through said spring element (5, 27) and said first anti-rotation surfaces (11, 24) are formed by protections extending outwardly from a hollow cylindrical protection of said head (15, 35).