A hearing aid anchoring fixture (104) for anchoring a direct bone conduction hearing aid (108) to the skull bone (106), comprising a threaded portion (110) that has at least one cutting edge (118). Each cutting edge (118) has an adjacent cavity (120) having a volume V.sub.c. The threaded portion (110) has a thread depth d.sub.t being half of the difference between the maximum outer diameter d.sub.1 of the threaded portion (120) and the inner diameter d.sub.2 of the thread, where d.sub.t is at least 10% of the maximum outer diameter d.sub.1 of the threaded portion (110) and where d.sub.t is less than 20% of the maximum outer diameter d.sub.1 of the threaded portion (110). The fixture (104) may be equipped with a flange portion (114) that has an outer diameter d.sub.3 being greater than the maximum diameter d.sub.1 of the threaded portion (110).