F16B25/103- Screws performing an additional function to thread-forming, e.g.F16B25/10- Screws performing an additional function to thread-forming, e.g. a tip out of a first material welded to shaft of a second material wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. F16B25/0094- Screws that cut thread in the body into which they are screwed, e.g.wood screws characterised by geometric details of the screw F16B25/0036- Screws that cut thread in the body into which they are screwed, e.g.wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. F16B25/0021- Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
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