Screw and screw system

Abstract

Screw (1) for mounting plate-shaped building materials whose bulk density is at least 1,000 kg / m3, comprising: a screw shank (2) having an external thread (3), a plate-shaped screw head (4) which forms a bearing surface (6) on an inner side (5) facing the screw shank (2) and is orthogonal to the screw shank (2), and at least one tool projection (7) on an outer side (8) of the screw head (4) facing away from the screw shank (2), characterized in that the screw (1) has a coating, at least in the area of ​​the screw head (2), which improves the adhesion of plastically workable, subsequently hardening coating materials.

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