Hanger Bolts are double-ended headless fasteners used to suspend objects from wood beams or to attach items to wood. Hanger Bolts have different threads at each end, Lag style threads for fastening into wood on one end while the other end features a machine screw style coarse (UNC) thread that accepts a hex nut or can thread into an internally threaded (tapped) hole, such as a threaded insert. Rod Coupling Nuts are often used with Hanger Bolts to mate them to a length of Threaded Rod to suspend electrical conduits, junction boxes, fixtures and ducting. The furniture industry uses them with corner brackets, tee nuts and whenever wood and machine screw threads are needed in a single fastener. Hanger bolts are also known as couch bolts or hanger screws.