6 Building materials of metal, namely, nuts, bolts, taper pins, tubing, screws, cone sleeves, positioning rings, support shells, flanges, flanged form connections, threaded parts, flange connections and quick-couplers being fastening and connection elements; tubes of metal, high pressure metal pipes; high pressure metal cylinders; self-tapping and insert bushings of metal; bolt-sleeve combinations, of metal, namely metal threaded fasteners; construction materials of metal for the production of shaft-hub connections, flanged form connections, shaft connections and axle connections of metal, namely, nuts, bolts, taper pins, tubing, screws, cone sleeves, positioning rings, support shells, flanges, flanged form connections, threaded fasteners, flange connections and quick-couplers being pipe connections