Cap screw for screwing boards on, especially gypsum fibre boards

摘要

When screwing boards on, a countersink of the screw head is often lengthened by one to two millimetres. In order to be able to carry this out even in the case of hardboards, for example in the case of gypsum fibre boards, as well with a reasonable application of force, the invention provides a cap screw, in which the screw head (2) is provided on its lower collar surface with cutting edges (7) to clear away board material. <IMAGE>