FIELD: machine building.
SUBSTANCE: screw anchor for fastening wood structure elements on concrete has rod (1) with first thread section (2) with screw thread (6) for screwing in wood and second thread section (3) with screw thread (7) for screwing in concrete; also, screw thread (6) for wood has equal or rather less pitch (p2), than pitch (p1) of thread (7) for concrete.
EFFECT: screw anchor withstanding higher stretching, bending or cross loads.
11 cl, 7 dwg
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