1. A family of devices (1; 20; 80) for fastening elements (40; 41; 42; 43; 44; 45) with cylindrical holes previously made in them (3; 22), each device containing a screw (4; 23 ; 81), made around the axis (5; 24; 82) and containing a truncated conical rod (6; 25; 83) and a head (7; 26; 84), - a sleeve (8; 27; 87), made with the possibility of entering the screw shaft therein, while the sleeve is made around the same axis and contains a cylindrical outer surface (9; 28; 89) and a truncated conical inner surface (10; 29; 90), characterized in that it contains at least least two devices, which sleeve to have an interference fit with the same outer diameter (16A; 16C) and varying degrees of (C1; C2) of the inner taper poverhnosti.2. The family according to claim 1, characterized in that the degree of taper is from 1% to 10%, preferably from 1% to 4%. The family according to claim 1, characterized in that the degree of taper depends on the selected and predefined interference fit (IF1; IF2) between the sleeve and the connected elements, while the interference fit corresponds to the difference between the hole diameter (18) and the outer diameter ( 16B; 16D) of the sleeve after an interference fit, - the distance called protrusion (PI; P2), between the lower surface (14; 33; 91) of the screw head and the upper surface (15; 34; 92) of the sleeve before an interference fit, - initial mounting clearance (J1; J2) between the outer diameter of the sleeve before a tight fit and a hole diameter of the element, reducing (Δ1; Δ2) the thickness (e8A; e8B; e27C; e27D) of the sleeve after tight fit, according to the formula C = (IF + J + Δ) /P.4. The family according to claim 2, characterized in that the degree of tapering depends on the selected and predetermined interference fit (IF1; IF2) between
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