housing 321 as shown in fig1 the tightening member 302 and the stud 304 are held together both axially and in rotation by the co operation by interference between the surfaces s 321 and s 341 as a result of this force fit of the male end 341 in the housing 321 the tightening member 302 and the stud 304 are held together both axially and in rotation by interference starting from this held together configuration the tightening member 302 is suitable by a turning movement r 1 for driving the stud 304 in rotation about its central axis x 304 more precisely the turning movement r 1 of the tightening member 302 causes the stud 304 to turn in the same direction without relative sliding between them furthermore in accordance with the invention the maximum friction force between the surfaces s 321 and s 341 i e the force beyond which there is no longer friction drive between the surfaces s 321 and s 341 is adapted to be equal to the force exerted by the surface s 321 on the surface s 341 when the rotary drive force c transmitted by the tightening member 302 to the stud 304 from their initial held together configuration is equal to a predetermined tightening force c 0 for application to the stud 304 the tightening member 302 and the stud 304 are thus suitable starting from their initial held together.