Hanger bolts are Thread studs used to suspend objects from or attach items to wood. Like a typical stud, they are headless which are double-ended Bolts or Screws (with no head) that have threads at each end—lag threads to screw into wood but, at the other end, machine screw threads to accept a nut or thread into an internally threaded (tapped) hole.These can be used to hang electrical wires or sheet metal parts to wood beams or structures. Other uses are in furniture, which help fasten pieces together for a solid fit.