Attachment member for securing plates of considerable thickness to structural members

Attachment member for securing very thick panels to a receiving material, such as a structural member, comprising an axially elongated cylindrical shank (2) having an axial length (1) and a leading end and a trailing end relative to the receiving material, said shank (2) having an outside diameter (s), said shank having a tip (3) at the leading end and a head (4) at the trailing end with said head projecting laterally outwardly from said shank, a contact pressure element (6) located in a trailing end region of said shank, an axially extending part laterally encircling said shank and being axially deformable for absorbing excess driving energy applied to said attachment member, an axially extending cylindrical sleeve (7) separate from said axially extending part and formed of a high strength material closely laterally enclosing said shank (2) for providing bending resistance for said shank and having an axial length in the range of 3/4 to 9/10 of the length of said shank (2) and an outside diameter (a) in the range of 1.4 to 3 times the diameter (s) of said shank, said sleeve (7) having a leading end and a trailing end with the trailing end arranged to support said contact pressure element (6).