Hanger bolt for mounting solar panels on roofs has wood screw thread at one end and machine thread at other, sections being separated by hexagonal section and cylindrical section and wood screw section having drilling point

摘要

The hanger bolt has a wood screw thread (2) at one end and a machine thread (3) at the other. These are separated by a hexagonal section (4) and cylindrical section (5). The wood screw section has a drilling point (6).